ATA 52 DOORS
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52.00 GENERAL
Presentation
This chapter deals with all DOORS fitted on ATR. Aircraft doors are designed to enable safe compartment pressurization. Doors have their own
warning system. For further information about landing gear doors, refer to the landing gear chapter.
Entry door. A door located on aft LH side of the passenger compartment is provided for access to the aircraft. The entry door is an outward
opening, non plug type door with a net opening of 0.72 m (28.5") wide, without hand-rails, and 1.75 m (68.8") high.
The mechanism is essentially composed of two handles, a lifting cam and locking shoot bolts placed on the rear part of the door. Folding hand-rails
are attached to the integrated stair structure, by means of a link to the fuselage structure, automatically erect when the door is open.
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52.00 GENERAL
Presentation
Service door. The service door is an outward opening, non plug type door, with a net opening of 0.69 meter (27 inches) wide and 1.27 meters (50
inches) high.
Opened position is forward. Door operation can be performed manually from inside or outside of the airplane.
Cargo door. The cargo door is an outward opening, non plug type door hinged at its upper edge giving a net clear opening of 1.30 meter (51
inches) wide by 1.57 meter (62 inches) high.
Cargo door opening and closing operations are possible only from outside (optional from inside).
The door is actuated by an electrical actuator. A hold open strut maintains the cargo door in the open position. It also protects the door from wind
gusts. The cargo door is unlocked by two levers and operated from a panel located outside.
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52.00 GENERAL
Presentation
Cockpit communication door. A machined door with a net opening of 17.5 centimeters (7 inches) wide and 15 centimeters (6 inches) high is
located immediately below the Captain's side window.
Forward compartment door. An inward opening manually operated hatch in the forward section of the nose landing gear bay gives external access
to the avionics compartment behind the main instrument panel.
Aft avionics compartment door. This door gives access to the rear unpressurized area of the aircraft (beyond the aft bulk compartment).
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52.00 GENERAL
Presentation
Cockpit emergency exit hatch. An emergency exit is provided for evacuation of the flight compartment.
One plug type hatch located in the cockpit roof is provided as an emergency exit for the flight crew. One escape rope is located in a compartment
on top of the electric rack near the exit. Some steps are provided for hatch access in the corridor RH side. Pilot overhead hatch is located in the
flight compartment fuselage structure, between FR 9 and FR 12.
Emergency exit doors. Two emergency exits (type III) are provided for evacuation of the passenger compartment. These two doors are located on
each side of the fuselage compartment, between FR 18 and FR 19, and between STR 6 and STR 12.
Rear entry door and service door can also be used as emergency exits (type I).
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52.00 GENERAL
Presentation
Door locking and unlocking operations are performed mechanically.
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52.00 GENERAL
Presentation
For safety reasons, doors opening is inhibited through vent doors when aircraft is pressurized (Delta pressure > 6 PSI).
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52.00 GENERAL
Presentation
Doors warning and indicating.
Doors warning system is used by the flight crew to check the correct locking of aircraft doors.
When all doors are safely closed, aircraft pressurization can be performed. The doors dedicated panel is located on 25 VU overhead panel and
doors status is also displayed on System Display CABIN page of the MFD.
The unlock amber lights are associated with:
- CAUTION flashing amber lights,
- DOOR in amber is displayed on EWD,
- a single chime audio alert.
The test pushbutton switch ensures check of the microswitches system of cabin door and service door. OK corresponding green light illuminates if
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52.00 GENERAL
Presentation
there is no problem during the test.
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52.00 GENERAL
Presentation
ATR standard 2 (STD 2) is available. The main difference is: cargo door replaced by a second passenger door.
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52.00 GENERAL
Presentation
The ATR cargo version is available.
The ATR cargo version with a larger cargo door is also available.
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52.00 GENERAL
Cockpit Panels
The doors panel is located on the overhead panel.
Multi Function Displays (MFD) are located in front of the pilots (3VU and 5VU).
Doors indications are displayed on the System Display CABIN page of the MFD.
EWD is located on center instrument panel.
A bite loaded magnetic indicator on the RH Maintenance Panel turns amber when a system failure has been recorded.
The MCDU panel is use by maintenance engineers to check MFC memory.
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52.00 GENERAL
Cockpit Panels
The cargo door control panel is located outside the aircraft.
Note: All lights on the panel are Push To Test (PTT).
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52.00 GENERAL
Cockpit Displays
The doors status is displayed on SD CABIN page of the "MFDs" (Cabin, Service, Cargo, Forward Compartment, Emergency).
Doors configuration is displayed:
State 1: doors are locked,
State 2: doors are unlocked,
State 3: doors signal is invalid.
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52.00 GENERAL
Interfaces
Doors system is composed of:
- Passenger and crew doors (entry and emergency),
- Service door,
- Forward compartment door,
- Cargo door and control panel,
- Tail cone access door,
- Landing gear doors.
For monitoring and controlling functions, the doors system interfaces with the electrical system.
Cargo door actuator and control panel are supplied by the Ground Handling Bus. This electrical bus is supplied by the Main Battery or the Ground
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52.00 GENERAL
Interfaces
Power Unit.
Doors are fitted on the fuselage structure.
Doors must be safely closed and secured to avoid air leak.
Electrical control signals permit to ensure the system operating.
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52.00 GENERAL
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Exercises
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52.00 GENERAL
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Exercises
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52.00 GENERAL
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Exercises
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52.00 GENERAL
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Exercises
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52.00 GENERAL
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Exercises
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52.00 GENERAL
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Exercises
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52.00 GENERAL
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Exercises
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52.11 PASSENGER AND CREW DOORS
System Description
The entry door is hinged on lower side (2 hinges), and opens downwards and outwards.
When open, it is supported on the ground by a rubber tired integral roller.
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52.11 PASSENGER AND CREW DOORS
System Description
The entry door consists of:
- a door box which contains the actuating mechanism,
- a stair box which is bolted on its inner surface. It gives access to the actuating mechanism when removed.
The stair box comprises:
- 5 integral steps,
- A sixth folding step which follows the door motion.
Note: the folding step, hinged on the fuselage, protects the door seal when the door is open. The pressure seal is depressed by door edges in the
door closed position.
- an emergency light located on the second step of the entry door. It is only used for emergency evacuation.
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52.11 PASSENGER AND CREW DOORS
System Description
- a folding handrail which erects when the door opens.
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52.11 PASSENGER AND CREW DOORS
System Description
- a balance and damper mechanism which comprises two springs and a damper.
- The springs balance the weight of the door.
- The damper minimizes the acceleration of the door during door opening / closing operations.
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52.11 PASSENGER AND CREW DOORS
System Description
The latching system deploys six shoot bolts, which move together. The locking system operates three latchlocks.
The two systems are sequenced such that the latchlocks, all moving together, engage when the shootbolts are in the final latched position.
The upper latch door drive-shaft operates the vent door. It remains opened in order to show evidence of a failure in the latching and locking
operation. Two springs keep the mechanism against stops in both the open and closed positions.
In the event of any unlatched shoot bolts, vent door will not close. This prevents the aircraft to be pressurized to an unsafe level.
Attached to the latchlock pins, indication flags bearing the words "LOCKED" and "UNLKD" show through the four viewer ports the door status.
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52.11 PASSENGER AND CREW DOORS
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System Operation
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52.11 PASSENGER AND CREW DOORS
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Exercises
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52.11 PASSENGER AND CREW DOORS
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Exercises
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52.11 PASSENGER AND CREW DOORS
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Exercises Level 2
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52.11 PASSENGER AND CREW DOORS
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Exercises Level 2
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52.11 PASSENGER AND CREW DOORS
Entry Door
The passenger entry door is located in the rear left part of the aircraft.
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52.11 PASSENGER AND CREW DOORS
Entry Door
The passenger door structure can be divided into two parts:
- door box,
- stair box. The stair becomes integral with door when bolted on its inner surfaces.
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52.11 PASSENGER AND CREW DOORS
Entry Door
Door box structure consists mainly of the following parts, in aluminum alloy material connected by clips and fastened with rivets and hi-lock:
- Outer skin provided with four cutouts, one for vent door, one for outer handle box, one for view port and one to house the ground support roller
installation.
- Door pan Four Z-sections spliced to provide a frame along the door periphery.
- Fourteen horizontal beams and vertical intercostals constitute the stiffening structure of the door.
- Inner skin used to close internally the box structure and provided with six large cutouts allows access to complete door actuating the
mechanism when the stair box is removed from the door box.
Stair box consists of the following parts in aluminum alloy material (except for the treads) coupled with rivets, screws and bolts:
- Forward and aft side panels (two places).
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52.11 PASSENGER AND CREW DOORS
Entry Door
- Steps (five places). Consisting of a vertical panel, a tread support panel and a bonded tread panel of nonmetallic honeycomb core and glass
fabric reinforced epoxy plies, provided anti sliding pads.
- Clips, angles and stiffeners, to strengthen and connect the stair box.
A pressure seal is installed on the fuselage along the surrounding sill structure of door opening and is depressed by door edges when the door is
closed.
A fail safe cable is installed between balance and door stair.
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52.11 PASSENGER AND CREW DOORS
Door Internal Mechanism
The passenger entry door is located in the rear left part of the aircraft.
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52.11 PASSENGER AND CREW DOORS
Door Internal Mechanism
The door internal mechanism consists of the following parts:
- Drive shaft: it operates the latching and locking mechanism from the movement of the handles.
- Latching mechanism: it mainly consists of six shoot bolts which lock the door into the fuselage when the door is closed and are retracted in the
door structure during door opening.
- Locking mechanism: it mainly consists of three latch lock pins which lock the shoot bolts in fuselage when the door is closed and release the
shoot bolts to open the door.
- Vent door mechanism: it consists of pressure vent door actuated by locking mechanism.
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52.11 PASSENGER AND CREW DOORS
Vent Door
A vent door is provided on the passenger door to regulate aircraft pressurization before unlocking the door and to indicate door locked/unlocked
position.
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52.11 PASSENGER AND CREW DOORS
Vent Door
A vent door is attached to the locking / unlocking mechanism for safety reasons.
The vent door opens when the entry door is unlocked.
Also, if the door is not correctly locked, the vent door staying opened prevents the aircraft to be pressurized to an unsafe level.
It also provides residual aircraft pressurization to be evacuated before unlocking the door. System is made such as if internal/external differential
pressure (?S) is greater than 6 PSI, door opening is not possible.
An end roller and a cam prevent door opening in case of negative pressure of 1 PSI.
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52.11 PASSENGER AND CREW DOORS
Folding Step and Light
A folding step is provided on the passenger door to protect the pressure seal.
The stairs are also provided with an emergency light which is incorporated into the vertical panel of the second step to illuminate the ground.
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52.11 PASSENGER AND CREW DOORS
Folding Step and Light
During opening of the door, a folding step follows the movement and protects the pressure seal.
The step is hinged inboard and rolls over the upper step by means of rollers.
A track fixed on the upper step guides the folding step to join the door closed position.
When it is extended, the folding step is latched by a little mechanism located on the forward side of the step. This one is disengaged when the door
closes.
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52.11 PASSENGER AND CREW DOORS
Folding Step and Light
The stair emergency light is supplied by PSU (Power Supply Unit) emergency lighting.
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52.11 PASSENGER AND CREW DOORS
Balance Mechanism
A balance mechanism, located below the lavatory sink, is provided to balance the weight of the passenger door.
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52.11 PASSENGER AND CREW DOORS
Balance Mechanism
The balance mechanism incorporates:
- two springs which balances the door weight when they are actuated,
- a torque tube,
- an arm which is connected to the aft side of door box structure,
- a rod which is hinged on aft side of door box structure. The rod is coupled with a fail safe cable.
The mechanism is also provided with a closure handle (bolted on inboard section of the arm) to allow the extension and retraction of the passenger
/ crew door from inside the aircraft.
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52.11 PASSENGER AND CREW DOORS
Handrails
There are two handrails provided on the passenger door. One is a folding handrail and another is a removable handrail.
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52.11 PASSENGER AND CREW DOORS
Handrails
The whole handrails system is operated by a link, fixed at one end on the fuselage floor and at the other end, to the sliding fitting on the aft
handrail. The aft handrail and forward handrail move together, connected by a torque tube through the integral stair structure.
The lock of the sliding fitting is operated with a quick release pin. A safety pin is unplugged to disengage the link to the fuselage. This one can slide
along the rod. The handrail does not erect if the door must be opened in emergency.
Note: For safety reasons, in the event of an emergency evacuation, the forward handrail can be held against the door.
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52.11 PASSENGER AND CREW DOORS
Viewer Inboard and Outboard
The passenger door provide three latch locks position viewers on the inside part of the door, and one on the outer part.
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52.11 PASSENGER AND CREW DOORS
Viewer Inboard and Outboard
Should any shoot bolt not latch, the latch lock pins cannot engage. The flags will show "UNLKD".
The inspection of all three latch locks is possible from inside of the aircraft through view ports located either on stairs step or stairs vertical panels,
by means of flags attached on the latch lock pins and bearing the words "LOCKED" or "UNLKD".
The inspection of all three latch locks is also possible from outside of the aircraft through a view port located near the outer door handle, on the left.
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52.11 PASSENGER AND CREW DOORS
Microswitches
Several microswitches are installed on the fuselage. The system consists of:
- three cabin shoot bolt position microswitches (7WS, 9WS, 11WS),
- one latch lock position microswitch (31WS).
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52.11 PASSENGER AND CREW DOORS
Microswitches
They provide an alerting signal if the door is not fully latched and locked.
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52.11 PASSENGER AND CREW DOORS
Microswitches
On ground, with the cabin door open, the microswitches system, which monitor the alarm, can be tested. "CAB OK" green illuminates on 25 VU
when the electrical continuity is correct.
The amber "UNLK" light extinguishes when all microswitches are in locked position.
Note: Each microswitch senses fully locked position of relevant passenger / crew door shoot bolts and of the latch-lock.
In addition, the view ports permit the flight attendant to check the latchlock pins status (seen in the door internal mechanism).
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52.21 PASSENGER COMPARTMENT EMERGENCY EXIT
System Description
Two passenger compartment emergency doors are provided for aircraft emergency evacuation. The two exits are located, one on each side of the
fuselage compartment, between FR 18 and FR 19 and between STR 6 and STR 12.
The two emergency exit doors (type III) of passenger compartment are hinged on the bottom (two spigot type hinge) and open inwards rotating on
hinges and falling down. Five stops are installed on the door pan structure, two per side (FWD and AFT) and one on the upper side.
A simple locking mechanism protrudes or retracts shoot bolt on the upper side of the door to lock and unlock the door in the fuselage opening.
The locking mechanism may be operated either from aircraft outside or inside. The outer handle has also the role of vent door, to prevent the cabin
pressurization to an unsafe level if the door is not completely locked.
A pressure seal is installed on door pan near the door outer skin periphery and is depressed by the fuselage skin surrounding the door cutout
when the door is closed.
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52.21 PASSENGER COMPARTMENT EMERGENCY EXIT
System Description
A window is provided in the center section of the door to allow the passengers to look outside.
The door structure consists of several parts in aluminum alloy material connected by rivets and hi-lock fasteners.
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52.21 PASSENGER COMPARTMENT EMERGENCY EXIT
System Operation
Door Opening from Aircraft Outside. The door is opened from outside by pushing the handle until the shoot bolt disengages the retainer on
fuselage, then leaving the door to come inside the fuselage.
Note: When the door is opened from outside it is not possible to hold it during the rotation and it falls down in the passenger compartment.
Door Opening from Aircraft Inside. The door is opened from inside by pulling down the inner handle to unlock the shoot bolt from the upper door
jamb, then the door will rotate inwards on lower hinges and holding it by inner handle, will be removed completely from the fuselage opening.
Door Closing (from Aircraft inside only).
1.Insert the door and engage the two fork hinges on the hinge fitting installed lower door jamb.
2.Holding the inner handle in open position (to retract the shoot bolt) insert the door in place on fuselage.
3.Release the handle and the door making sure that the shoot bolt is engaged in its housing.
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52.21 PASSENGER COMPARTMENT EMERGENCY EXIT
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
System Description
The emergency hatch is hinged on forward side (two spigot type hinge) and opens inwards rotating on hinges and falling down.
Two stops are installed on the aft side.They carry the pressurization load. A pressure seal which serves also to avoid the rain entering inside the
flight compartment is mounted around the hatch pan near the hatch outer skin, and is depressed by the fuselage skin surrounding the hatch cutout
when the hatch is closed.
Two handles (internal and external) operate an internal device which in turn pushes or retracts a shoot bolt to lock and unlock the hatch in the
fuselage opening.
An additional internal handle is installed on the door to allow partial opening of the door. One escape rope and some steps are built on lateral side
of the electric rack to allow evacuation through opening of the hatch.
A microswitch is located on the fuselage in correspondance with the shoot bolt to provide an alerting signal if the door is not fully locked and in
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
System Description
addition a proximity switch is installed inside the door that senses the lock position of internal handle.
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
System Operation
Hatch Opening from Aircraft Outside. The hatch is opened from outside by pressing a handle release button (to clear the outer handle from the
stowed position) then by pulling the handle forwards to unlatch the shoot bolt from the retainer fitting installed on aft jamb. The opening is
completed by leaving the hatch free to rotate downwards around the hinge (on forward side) and to go inside the flight compartment. WARNING:
Before releasing the outer handle it is necessary to make sure that no crew members or other people be injured by the hatch falling down.
Hatch Opening from Aircraft Inside. The hatch is opened from inside by pulling down and afterwards the inner handle to unlock the shoot bolt from
the retainer fitting on fuselage then supporting the hatch which initially rotates on the forward hinges and after falls down because of its own
weight. WARNING: The inner handle and the complete hatch should be held firmly by hand to avoid its accidental fall down during opening and
removal operations. A stay attached between hatch lining surround and internal lining contour allows the hatch partially opening. After hatch
opening, hold it in position by hinges engaged, then unlock hatch stay from its spring clip placed on hatch door surround. After this operation
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
System Operation
adding stop guard to avoid crew member hurting.
Hatch Closing. The hatch can be closed only from inside of the fuselage, performing the reverse procedures used to open. WARNING: Verify that
outer handle is flush with hatch outer skin before placing the hatch inside the opening (hook of pushbutton retaining inside the outer handle).
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
Microswitches
An emergency hatch is provided, on the flight compartment, behind the overhead circuit breakers panel.
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
Microswitches
The microswitch, situated in the fuselage, detects the shootbolt good position (hatch locked).
The proximity switch, situated in the cockpit hatch, verifies that the handle is in closed position.
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52.22 FLIGHT COMPARTMENT OVERHEAD HATCH
Microswitches
The cockpit hatch unlocking is monitored in the cockpit on the DOORS panel. This alarm is provided by a microswitch and a proximity switch.
The 38 WS proximity switch and the 34 WS microswitch transmit information to MFC 2 Module 2A. They will illuminate the UNLK amber light and
the CCAS is activated.
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52.42 FLIGHT COMPARTMENT COMMUNICATION DOOR
System Description
A door is located on flight crew compartment LH side (close to Captain's seat).
The pilot communication door structure consists of machined aluminium, with integral stiffeners, two hinges on the bottom edge and two stops on
the top.
A multiple load path feature is incorporated in the stops and hinges design to carry the pressure load. For the pilot communication door, only a
quick release latch system allows door locking and unlocking.
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52.42 FLIGHT COMPARTMENT COMMUNICATION DOOR
System Operation
The communication door is a plug type located between FR 8 and FR 9. It is hinged by two hinges on lower side and opens inwards. Two stops,
one for each upper corner, serve to carry the pressurization load.
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52.42 FLIGHT COMPARTMENT COMMUNICATION DOOR
MW52.42_.03.E1L1
Exercises
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52.42 FLIGHT COMPARTMENT COMMUNICATION DOOR
MW52.42_.03.E1L1
Exercises
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52.42 FLIGHT COMPARTMENT COMMUNICATION DOOR
MW52.42_.04.E1L2
Exercises Level 2
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52.42 SERVICE DOORS
System Description
The service door is located on the right side of the aft end of the passenger compartment between FR 37 and FR 39 and between STR 8 and STR
14.
The service door is hinged on FWD side (two hinges) and opens outwards and then forwards against the side of the fuselage.
When fully open, the door is held against the fuselage by a springloaded hook to engage the door's external handle.
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52.42 SERVICE DOORS
MW52.42_.06.S2L2
System Operation
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52.42 SERVICE DOORS
MW52.42_.07.E1L1
Exercises
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52.42 SERVICE DOORS
MW52.42_.08.E1L2
Exercises Level 2
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52.42 SERVICE DOORS
MW52.42_.08.E1L2
Exercises Level 2
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52.42 SERVICE DOOR
Door Structure
The service door is located on the right side of the aft end of the passenger compartment between FR 37 and FR 39 and between STR 8 and STR
14.
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52.42 SERVICE DOOR
Door Structure
The service door is hinged on forward side (two hinges) and opens outwards and then forwards against the side of the fuselage.
When fully open, the door is held against the fuselage by a spring-loaded hook to keep the door external handle is open position.
The structure of the service door consists of the following parts in aluminum alloy material fastened with rivets and hi-lock:
- Outer skin,
- Beams and intercostals to constitute the stiffening structure of the door, interconnected and reinforced by clip and doublers. The mechanism
installations and the localized structural operating loads are hold by fittings, support and brackets.
- Inner skin.
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52.42 SERVICE DOOR
Door Internal Mechanism
The service door is located on the right side of the aft end of the passenger compartment between FR 37 and FR 39 and between STR 8 and STR
14.
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52.42 SERVICE DOOR
Door Internal Mechanism
The service door internal mechanism consists of two separate systems:
- A latching system: The latching system pushes longitudinally five shoot bolts (two on forward side and three on aft side) which engage and
disengage the respective retaining rollers installed on fuselage door jamb.
- A locking system: The locking system operates two latch-locks that engage and disengage the upper and lower shoot bolts on aft side.
These systems are driven by the drive shaft actuated by the handles.
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52.42 SERVICE DOOR
Vent Door
A vent door is installed in the upper section of the service door outer skin.
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52.42 SERVICE DOOR
Vent Door
The vent door is hinged on lower side, opens inwards and is driven by the locking mechanism in closing and opening operations.
If the door is not correctly locked, the vent door staying opened prevents the aircraft to be pressurized to an unsafe level.
Note: It also provides residual aircraft pressurization to be evacuated before unlocking the door.
System is made as such as if aircraft pressurization is greater than 6 PSI ?P from inside, door opening is not possible.
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52.42 SERVICE DOOR
Hold Open Device
When fully opened, the service door is held against the fuselage by a hook spring-loaded, located to the right of the door.
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52.42 SERVICE DOOR
Hold Open Device
The hold-open device is composed of:
- a hook retractable in the aircraft structure,
- a spring loaded to erect the hook,
- a rod,
- a lever.
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52.42 SERVICE DOOR
Hold Open Device
When the door is closed, the lever is pushed by the door mounted support. The hook is stored in the aircraft structure.
As the door is open, the lever returns to its rest position. The hook erects.
It can catch the external lever, now in vertical position (open position).
To disengage the service door, the lever has to be pushed. The door is then free to be closed.
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52.42 SERVICE DOOR
Viewer Inboard and Outboard
These view ports are fitted on the service door:
- One view port is located on the service door outer skin,
- Two view ports are located on the service door inner skin adjacent to the two latch-locks.
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52.42 SERVICE DOOR
Viewer Inboard and Outboard
The view ports allow inspection of latch-locks position by means of flags attached to structure and bearing the words LOCKED and UNLKD.
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52.42 SERVICE DOOR
Microswitches
The system consists of:
- two service shoot bolt position microswitches (8 WS, 10 WS).
- one service door latch lock position microswitch (36 WS), each one sensing the fully locked position of the door shoot bolts and of the
latch-lock.
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52.42 SERVICE DOOR
Microswitches
Microswitches provide an alerting signal if the door is not secured closed.
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52.42 SERVICE DOOR
Microswitches
On ground, with the service door open, the microswitches system, which monitors the alarm, can be tested. "SVCE OK" green light illuminates on
25 VU when the electrical continuity is correct.
The amber "UNLK" light extinguishes when the microswitches are in locked position.
In addition, the view ports permit the flight attendant to check the latchlock pins status (seen in the door internal mechanism).
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52.31 CARGO COMPARTMENT DOOR
System Description
The cargo door is located on the fuselage left forward side. It gives a large access to the forward cargo compartment for an easy luggage loading.
The cargo door is an outward opening, non plug type door hinged at its upper edge giving a net clear opening of 1.30 m (51") wide by 1.57 m (62")
high. The door is actuated by an electrical actuator.
A hold open strut maintains the cargo door in the open position. It also protects the door from wind gusts.
The cargo door is unlocked by two mechanical levers and operated from a panel located outside the aircraft.
Note: Cargo door opening / closing operation from inside the aircraft is optional.
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52.31 CARGO COMPARTMENT DOOR
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System Operation
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52.31 CARGO COMPARTMENT DOOR
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Exercises
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52.31 CARGO COMPARTMENT DOOR
MW52.31_.04.E1L2
Exercises Level 2
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52.31 CARGO COMPARTMENT DOOR
MW52.31_.04.E1L2
Exercises Level 2
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52.31 CARGO COMPARTMENT DOOR
Door Structure
A cargo door is provided for access to the forward cargo compartment and is an outward opening type (not plug type). The door is located on the
left side of the fuselage between "FR 14" and "FR 17" and between "STR 6" and "STR 15".
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52.31 CARGO COMPARTMENT DOOR
Door Structure
The outer skin is provided with cutouts for the vent door, the handle box, view ports and access panels.
In ATR 42 version, a wing scan light is also provided on the outer skin of the door, above the vent door.
The door is structural, carrying both hoop and shear loads. Hoop loads are carried by the hinge at the upper edge and by three hooks at the lower
edge, while the shear loads are carried by shear fittings at the forward, aft and top side of the door and by latch mechanism hooks at the bottom.
The cargo compartment door is hinged on upper side (two adjacent continuous hinge sections) and opens outwards and upwards with a nominal
travel of 87° (3° of overtravel allowed).
The door is provided with a pressure seal (terylene reinforced silicone rubber bulb type seal) attached to the door periphery with a rolled section
retainer.
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52.31 CARGO COMPARTMENT DOOR
Door Internal Mechanism
A cargo door is provided on the forward left part of the aircraft.
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52.31 CARGO COMPARTMENT DOOR
Door Internal Mechanism
Two separate and independent mechanical systems are located inside the door structure to latch and lock the door. This is to prevent its
accidental opening in flight.
The latching action is performed by three hooks (installed on lower side of the door) that engage the latch spool fitting installed on the relative
jamb.
The hooks are driven by the internal latching mechanism which is operated by the lower handle.
The locking action is performed by three locking pins machined to engage with the latching hooks in the closed position, thus preventing hooks
unlatched rotation. The locking pins are driven by the internal locking mechanism which is operated by the upper handle.
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52.31 CARGO COMPARTMENT DOOR
Vent Door
A vent door is installed on the cargo door outer skin, on the left of the handles.
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52.31 CARGO COMPARTMENT DOOR
Vent Door
The vent door is hinged on its lower side and opens inwards.
It is driven by the locking mechanism and its purpose is to show, when is not in fully closed position, a failure in the locking system and to prevent
pressurization of the cabin increasing to an unsafe level if the cargo door is not fully latched and locked.
The vent door also allows residual aircraft pressurization to be evacuated before unlocking the door.
The system is made as such that if aircraft pressurization is greater than 6 PSI ?S from inside, door opening is not possible.
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52.31 CARGO COMPARTMENT DOOR
Cargo Door Actuator
The door is actuated by an electrical linear actuator installed between the jamb and door upper forward side door opening (FR14 to FR15).
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52.31 CARGO COMPARTMENT DOOR
Cargo Door Actuator
The cargo door electrical motor is supplied with 28 VDC GND HDLG Bus.
The cargo door actuator is a screw jack type. It comprises:
- a DC electrical motor with brake,
- a reduction gear assembly including a torque limiter,
- a screw jack assembly.
The electrical motor turns in the two directions.
The brake installed in the motor is electromagnetic. At rest, the brake is engaged, to avoid the motor turning. As soon as the motor is electrically
supplied, the brake is disengaged. The brake ensures that the cargo door remains open.
A jack can be operated manually in case of motor or command circuit failure. A worm screw jack is operated, through the reduction gear assembly
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52.31 CARGO COMPARTMENT DOOR
Cargo Door Actuator
and the cargo door.
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52.31 CARGO COMPARTMENT DOOR
Hold Open Structure
A folding rod is installed between the door and fuselage to hold the door in the correct open position.
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52.31 CARGO COMPARTMENT DOOR
Hold Open Structure
The hold-open strut is provided with two proximity switches (prevention of cargo door actuator working when strut is in the extended position) and
relevant wiring.
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52.31 CARGO COMPARTMENT DOOR
Microswitches
Proximity switches are provided to detect fully engaged/disengaged position and latched position. They are located on the lower part of the door,
near relevant hooks.
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52.31 CARGO COMPARTMENT DOOR
Microswitches
The system is supplied by 28 VDC GND / HDLG Bus via corresponding circuit breakers and consists of the following components:
- three proximity switches (18 MP, 19 MP, 20 MP) each one sensing the fully engaged position of relevant hook,
- three proximity switches (15 MP, 16 MP, 17 MP) each one sensing the fully disengaged position of relevant hook,
- a proximity switches 22 MP sensing the latched position of the forward latchlock.
The system allows to start door opening after unlocking / unlatching operations and door closing.
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52.31 CARGO COMPARTMENT DOOR
Microswitches
The cargo door is now ready to be operated. The green "Cargo Door Armed" light, on 5001 VU, is illuminated. All the hooks are open. The
proximity switches 15 MP, 16 MP and 17 MP are activated and 12 MP opened.
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52.31 CARGO COMPARTMENT DOOR
Viewer Inboard and Outboard
View ports are located on the lower side of the outer door skin to inspect all three latchlock pins from outside.
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52.31 CARGO COMPARTMENT DOOR
Viewer Inboard and Outboard
The three cargo door view ports show if the three locking pins are engaged with the latching hooks in closed position (locked position), or not
(unlocked position).
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52.41 FORWARD COMPARTMENT DOOR
System Description
The forward avionic compartment door is located on the NLG wheel well upper bulkhead between FR 1 and FR 3.
It is a plug type, hinged on its forward side by two conventional hinges, opening upwards and forwards and has a lock on its aft side.
A microswitch is located on the fuselage in correspondence with the lock to provide a signal alert to the crew if the door is not fully locked.
MW52.41_.01.S1L1
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52.41 FORWARD COMPARTMENT DOOR
MW52.41_.02.S2L2
System Operation
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52.41 FORWARD COMPARTMENT DOOR
MW52.41_.03.E1L1
Exercises
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52.41 FORWARD COMPARTMENT DOOR
MW52.41_.03.E1L1
Exercises
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52.41 FORWARD COMPARTMENT DOOR
MW52.41_.04.E1L2
Exercises Level 2
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52.41 TAIL CONE ACCESS DOOR
System Description
The aft avionic compartment door is located on the rear fuselage between FR 45 and FR 46.
It is a non-plug type hinged on the left side by means of two piano hinges and has two latches on the right side.
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52.41 TAIL CONE ACCESS DOOR
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System Operation
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52.41 TAIL CONE ACCESS DOOR
MW52.41_.07.E1L1
Exercises
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52.41 TAIL CONE ACCESS DOOR
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Exercises
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52.41 TAIL CONE ACCESS DOOR
MW52.41_.08.E1L2
Exercises Level 2
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52.70 DOOR WARNING
System Description
The doors warning and indicating system gives indications of correct locking of doors by means of warning amber lights located on overhead panel
25 VU. A test pushbutton is used to verify correct operation of the system. Doors status is also displayed on System Display CABIN page of the
MFD.
The following lists are controlled on 25 VU overhead panel and on the SD/CABIN of the MFD:
- CABIN (Passenger / crew door),
- CARGO DOOR,
- FWD COMPT (Fwd avionic compt door),
- EMERGENCY HATCH,
- SERVICE DOOR.
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52.70 DOOR WARNING
System Description
The door alert amber lights illuminate, the associated door label is displayed in amber and the CCAS is activated when the associated door is not
detected locked by the microswitches.
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52.70 DOOR WARNING
System Operation
Cabin door and service door microswitches can be tested on DOORS panel.
The eventual failure of proximity switches on emer hatch and cargo doors are detected and memorized by MFC which allows to locate rapidly from
the 702VM panel each proximity switch through a corresponding failure code.
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52.70 DOOR WARNING
System Operation
When the service door is open, it is possible to check it, by pressing SW TEST pushbutton.
In this condition, (if all microswitches are correct) the unlocked (true) position of the 3 microswitches is connected in series. Green "SVCE OK"
legend appears on DOORS panel.
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52.70 DOOR WARNING
System Operation
When the cabin door is open, it is possible to check it, by pressing SW TEST pushbutton.
In this condition, (if all microswitches are correct) the unlocked (true) position of the 4 microswitches is connected in series. Green "CAB OK"
legend appears on DOORS panel.
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52.70 DOOR WARNING
MW52.70_.03.E1L1
Exercises
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52.70 DOOR WARNING
MW52.70_.04.E1L2
Exercises Level 2
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52.70 DOOR WARNING
MW52.70_.04.E1L2
Exercises Level 2
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52.CI CONTROLS AND INDICATORS
Doors Overhead Panel
Doors system indications are located on Doors Panel and on Multi Function displays (Cabin SD page).
When all doors are closed all lights are extinguished on DOORS panel.
Green symbols are displayed on MFD.
SW - TEST pushbutton
Enables to test the microswitches system on cabin and service door. This test has to be performed on ground, doors open.
CAB OK green light
The light illuminates when depressing TEST pushbutton on ground, only if cabin door is open and if associated microswitches are in unlocked
position.
SVCE OK green light
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52.CI CONTROLS AND INDICATORS
Doors Overhead Panel
The light illuminates when depressing TEST pushbutton on ground, only if service door is open and if associated microswitches are in unlocked
position.
CABIN UNLK amber light:
CCAS is activated when cabin door is not seen locked (one or more microswitches in unlocked position). Doors are monitored through MFC.
Amber "CABIN" label is displayed on MFD.
CARGO UNLK amber light:
CCAS is activated when cargo door is not seen locked (one or more proximity switches in unlocked position). Doors are monitored through MFC.
Amber "CARGO" label is displayed on MFD.
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52.CI CONTROLS AND INDICATORS
Doors Overhead Panel
EMER UNLK amber light:
CCAS is activated when cockpit emergency exit hatch is not seen locked (microswitch or proximity switch in unlocked position). Doors are
monitored through MFC.
Amber "EMER" label is displayed on MFD.
SVCE UNLK amber light:
CCAS is activated when service door is not seen locked (one or more microswitches in unlocked position). Doors are monitored through MFC.
Amber "SVCE" label is displayed on MFD.
FWD COMPT UNLK amber light:
CCAS is activated when forward compartment door is not seen locked (microswitch in unlocked position). Doors are monitored through MFC.
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52.CI CONTROLS AND INDICATORS
Doors Overhead Panel
Amber "FWD COMPT" label is displayed on MFD.
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52.CI CONTROLS AND INDICATORS
Maintenance Panel
Doors system recorded failure indication are given on RH Maintenance Panel.
- MFC bite loaded indicates that door proximity switches failures are recorded in the MFC memory.
- Failures codes can be read by MCDU.
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52.CI CONTROLS AND INDICATORS
Cargo Door Panel
The cargo door panel is located near cargo door, outside the aircraft.
"Cargo door armed" green light
Is ON when Actuator Selector Switch working conditions are met. These conditions are:
- Panel cover opened,
- Door unlocked by operating handle: all hooks are disengaged (and FWD latchlock is unfastened).
"Cargo door latched" blue light
Is ON when all doors hooks and latchlocks are fully engaged.
Ground handling bus "ON BAT" red light
Is ON when Ground Handling Bus is directly supplied by Hot Main Bat Bus.
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52.CI CONTROLS AND INDICATORS
Cargo Door Panel
Note: This light shows that the main battery is emptying even if the BAT toggle switch is in OFF position (visible even when the panel cover is
closed).
Actuator selection switch
Is used to operate the door (opening or closing) when the "SELECT ARMED" green light is on.
Panel cover switch
Connects the Ground Handling Bus on line when the panel cover is opened.
Cargo bay light switch
Allows activation of the cargo bay light from outside.
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52.00 GENERAL
Safety and Precautions
Warning:
Opening a pressure sealed door when the aircraft if fully or partially pressurized will cause explosive decompression, death or injury to personnel
and damage to the aircraft.
Warning:
- The operations should be accomplished by standing in front of the door and avoiding to put the fingers between door and fuselage cutout the
initial extension travel, because an inadvertent actuation of the close position from aircraft inside, can injury to outboard operator hands.
- Beware with springs fitted on passenger door in case of removal or installation action.
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52.00 GENERAL
Maintenance Operations
This module presents the various tasks programmed regarding the Doors System, according to their periodicity (A: A check, C: C check, LC: Line
Check, WY: Weekly, MEL: Minimum Equipment List, DY: Daily Check).
The contained information in the following tables results from the maintenance planning program, based on Maintenance Review Board Report
document (MRBR). ATR defines a standard document MPD (Maintenance Planning Document) where the maintenance programmed tasks are
identifies.
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Table of contents
52.00 GENERAL .............................................................................................................................................................................................................................................................
2
Presentation .............................................................................................................................................................................................................................................................
2
Cockpit Panels .........................................................................................................................................................................................................................................................
12
Cockpit Displays ......................................................................................................................................................................................................................................................
14
Interfaces ................................................................................................................................................................................................................................................................
15
Exercises ................................................................................................................................................................................................................................................................
17
52.11 PASSENGER AND CREW DOORS .....................................................................................................................................................................................................................
24
System Description ..................................................................................................................................................................................................................................................
24
System Operation ....................................................................................................................................................................................................................................................
29
Exercises ................................................................................................................................................................................................................................................................
30
Exercises Level 2 .....................................................................................................................................................................................................................................................
32
Entry Door ................................................................................................................................................................................................................................................................
34
Door Internal Mechanism .........................................................................................................................................................................................................................................
38
Vent Door ................................................................................................................................................................................................................................................................
40
Folding Step and Light .............................................................................................................................................................................................................................................
42
Balance Mechanism .................................................................................................................................................................................................................................................
45
Handrails ................................................................................................................................................................................................................................................................
47
Viewer Inboard and Outboard ..................................................................................................................................................................................................................................
49
Microswitches ..........................................................................................................................................................................................................................................................
51
52.21 PASSENGER COMPARTMENT EMERGENCY EXIT .........................................................................................................................................................................................
54
System Description ..................................................................................................................................................................................................................................................
54
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System Operation ....................................................................................................................................................................................................................................................
56
Exercises ................................................................................................................................................................................................................................................................
57
Exercises Level 2 .....................................................................................................................................................................................................................................................
59
52.22 FLIGHT COMPARTMENT OVERHEAD HATCH ..................................................................................................................................................................................................
61
System Description ..................................................................................................................................................................................................................................................
61
System Operation ....................................................................................................................................................................................................................................................
63
Exercises ................................................................................................................................................................................................................................................................
65
Exercises Level 2 .....................................................................................................................................................................................................................................................
67
Microswitches ..........................................................................................................................................................................................................................................................
68
52.42 FLIGHT COMPARTMENT COMMUNICATION DOOR ........................................................................................................................................................................................
71
System Description ..................................................................................................................................................................................................................................................
71
System Operation ....................................................................................................................................................................................................................................................
72
Exercises ................................................................................................................................................................................................................................................................
73
Exercises Level 2 .....................................................................................................................................................................................................................................................
75
52.42 SERVICE DOORS ................................................................................................................................................................................................................................................
76
System Description ..................................................................................................................................................................................................................................................
76
System Operation ....................................................................................................................................................................................................................................................
77
Exercises ................................................................................................................................................................................................................................................................
78
Exercises Level 2 .....................................................................................................................................................................................................................................................
79
52.42 SERVICE DOOR ...................................................................................................................................................................................................................................................
81
Door Structure ..........................................................................................................................................................................................................................................................
81
Door Internal Mechanism .........................................................................................................................................................................................................................................
83
Vent Door ................................................................................................................................................................................................................................................................
85
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Hold Open Device ....................................................................................................................................................................................................................................................
87
Viewer Inboard and Outboard ..................................................................................................................................................................................................................................
90
Microswitches ..........................................................................................................................................................................................................................................................
92
52.31 CARGO COMPARTMENT DOOR ........................................................................................................................................................................................................................
95
System Description ..................................................................................................................................................................................................................................................
95
System Operation ....................................................................................................................................................................................................................................................
96
Exercises ................................................................................................................................................................................................................................................................
97
Exercises Level 2 .....................................................................................................................................................................................................................................................
98
Door Structure ..........................................................................................................................................................................................................................................................
100
Door Internal Mechanism .........................................................................................................................................................................................................................................
102
Vent Door ................................................................................................................................................................................................................................................................
104
Cargo Door Actuator ................................................................................................................................................................................................................................................
106
Hold Open Structure ................................................................................................................................................................................................................................................
109
Microswitches ..........................................................................................................................................................................................................................................................
111
Viewer Inboard and Outboard ..................................................................................................................................................................................................................................
114
52.41 FORWARD COMPARTMENT DOOR ...................................................................................................................................................................................................................
116
System Description ..................................................................................................................................................................................................................................................
116
System Operation ....................................................................................................................................................................................................................................................
117
Exercises ................................................................................................................................................................................................................................................................
118
Exercises Level 2 .....................................................................................................................................................................................................................................................
120
52.41 TAIL CONE ACCESS DOOR ................................................................................................................................................................................................................................
121
System Description ..................................................................................................................................................................................................................................................
121
System Operation ....................................................................................................................................................................................................................................................
122
Copyright © 2011-2012 - ATR Training Centre - All right reserved For Training Only
Exercises ................................................................................................................................................................................................................................................................
123
Exercises Level 2 .....................................................................................................................................................................................................................................................
125
52.70 DOOR WARNING .................................................................................................................................................................................................................................................
126
System Description ..................................................................................................................................................................................................................................................
126
System Operation ....................................................................................................................................................................................................................................................
128
Exercises ................................................................................................................................................................................................................................................................
131
Exercises Level 2 .....................................................................................................................................................................................................................................................
132
52.CI CONTROLS AND INDICATORS ...........................................................................................................................................................................................................................
134
Doors Overhead Panel ............................................................................................................................................................................................................................................
134
Maintenance Panel ..................................................................................................................................................................................................................................................
138
Cargo Door Panel ....................................................................................................................................................................................................................................................
139
52.00 GENERAL .............................................................................................................................................................................................................................................................
141
Safety and Precautions ............................................................................................................................................................................................................................................
141
Maintenance Operations ..........................................................................................................................................................................................................................................
142
Copyright © 2011-2012 - ATR Training Centre - All right reserved For Training Only