Air Conditioning & Pressurization
1. When are the RAM air doors full open:
A. On the ground
B. *On the ground or during slow flights with the flaps extended
C. On the ground or during slow flights with the flaps retracted
2. The purpose of the recirculation fan is:
A. to increase the use of bleed air
B. to heat the cargo compartment
C. *to reduce the air conditioning system pack load and the engine bleed air demand
3. The pressurization AUTO system consists of:
A. two controllers operating at the same time
B. One main controller and one alternate
C. *two identical controllers alternately use as primary for each new flight
4. Air conditioning for the flight deck is supply by:
A. the right pack
B. *the Left pack
C. the mix manifold
5. What does illumination of the amber OFF SCHEDULE DESCENT light indicate?
A. The cabin pressurization controller is unable to maintain pressurization
B. The cabin pressurization controller has failed and has switched automatically to ALTN
C. *The aeroplane has descended before reaching the planned cruise altitude, set in the
flight altitude indicator
6. The cabin will be pressurised automatically to approximately 0,1 psid on the ground
when:
A. *engine thrust is increased for take-off
B. when the PSEU is activated
C. all doors are closed for departure
7. Which fault condition can be reset by means of the TRIP RESET switch?
A. *BLEED TRIP OFF
B. *PACK TRIP OFF
C. *ZONE TEMP
D. WING BODY OVERHEAT
8. Suppose the aeroplane is at cruise altitude and the pressurization system is working in
AUTO mode. When the aeroplane now would start to climb and the FLT ALT is not
adjusted accordingly, the differential might increase to the maximum value of:
A. 7.9 psid
B. *8.35 psid
C. 9.1 psid
9. Cabin pressurization AUTO mode is active. The AUTO FAIL light will illuminate when:
A. *cabin altitude exceeds 15,800 ft
B. the rate of cabin pressure change exceeds 1000 sea level ft/min
C. the pressurization mode selector is moved to ALTN
10. When both the AUTO FAIL light and the ALTN light illuminate:
A. pressurization control has automatically switched to standby mode
B. *pressurization control has automatically switched to the other automatic controller
C. pressurization control has automatically switched to manual mode
11. With all Temperature Control Selectors positioned OFF ____. (select all that apply)
A. *The packs will operate in the fixed cabin temperature mode.
B. The pack control valve will be selected off automatically
C. *The right pack will produce 18°C air
D. The left pack will produce 18°C air
12. Illumination of the CONT CAB ZONE TEMP light indicates: (select all that apply)
A. *The associated trim air modulating valve has closed automatically
B. Failure of a single controller
C. *A zone over-temp
D. *Failure of the primary and secondary controllers
13. When will a pack automatically go to high flow? (select all that apply)
A. With one pack operating, in flight with flaps extended.
B. *With one pack operating, in flight with flaps retracted
C. With both packs operating and controller senses need for additional air flow
D. *When operating one pack from APU, with both engine BLEED Air switches OFF
14. If bleed air from the engines is unavailable, the APU is capable of supplying bleed air for
two packs on the ground, and one pack in flight
A. *True
B. False
15. With PACK light illuninated, the TRIP RESET button will reset the pack valve after the
condition is corrected.
A. *True
B. False
16. Cargo heat is controlled from the flight deck
A. True
B. *False
17. The mix manifold receives air from: (select all that apply)
A. The ram air inlet
B. *The left pack
C. *The right pack
D. *The recirculation fans
18. FWD SUPPLY DUCT temperature indicates the temperature from ___.
A. The outlet temperature of the right pack
B. The flight deck
C. The forward passenger zone
D. *The duct temperature leading to the forward passenger zone.
19. Alternate equipment cooling operates automatically on all B737NG aircraft
A. True
B. *False
20. The PACK light in flight indicates?
A. *Pack over-temperature
B. Failure of a single controller
C. *Failure of both pack controllers
D. Pack over-pressure
21. The equipment cooling system contains ___ fans.
A. 4 fans, all supply
B. 4 fans, 2 supply and 2 exhaust
C. 2 fans, 1 supply and 1 exhaust
D. 2 fans, all exhaust
22. An equipment cooling OFF light indicates low airflow in the associated fan
A. *True
B. False
23. Which relief valve prevents ambient pressure from exceeding cabin pressure by an
excessive amount?
A. Overboard exhaust valve
B. *Negative pressure relief valve
C. Positive pressure relief valve
D. Cabin outflow valve
24. How many DC motors are able to control the outflow valve?
A. 1
B. 2
C. *3
D. 4
25. When does the cruise phase of the pressurization system start?
A. Once both main landing gear are in the air
B. *When the aircraft is within 0,25 psi of the selected FLT ALT.
C. When the aircraft is reaches the selected FLT ALT
D. If the aircraft descends prior to reaching the selected FLT ALT
26. What warnings will occur if the cabin altitude exceeds 10000 feet?
A. *The cabin altitude warning horn sounds
B. the AUTO FAIL light illuminates
C. The OFF SCHED DESCENT light illuminates.
27. What are the indications of a single auto controller failure?
A. *AUTO FAIL and ALTN lights illuminated
B. MANUAL light illuminated
C. ALTN light illuminated
D. AUTO FAIL light illuminated
28. Regarding the cabin pressurization panel, the green MANUAL light illuminates when:
A. Cabin pressure is lost
B. Both auto pressure controllers have failed
C. *The pressurization mode selector is positioned to MAN position only
D. The AC-driven outflow valve has failed, use of DC-driven valve is then only possible
manually
29. What is the normal cabin differential pressure when flying above 37000ft?
A. 9,1 psid
B. 7,45 psid
C. *8,35 psid
30. The air conditioning of the passenger cabin is normally accomplished by:
A. *Combining excess air from the left pack, air from the right pack and air from the
recirculation system in the mix manifold. Mixed air is then distributed to the passenger
cabin
B. A ground air conditioning source connected to the mix manifold
C. Conbining air from the right pack and air from the recirculation system in the mix
manifold. Mixed air is then distributed to the passenger cabin
D. Combining excess air from the left pack and air from the right pack in the mix
manifold. Mixed air is then distributed to the passenger cabin.
31. Regarding pack temperature control: if a primary pack control fails, the affected pack is
controlled by:
A. The primary pack control in the opposite controller
B. *The standby pack control in the opposite controller
C. The standby pack control in the affected pack
32. How is the forward cargo compartment heated?
A. *By air circulated from the equipment cooling system and/or passenger cabin
B. By air circulated from the flight deck only
C. By air circulated from the passenger cabin only
D. By air circulated from the equipment cooling system and/or flightdeck
33. The automatic cabin pressure controllers receive barometric corrected altitudes from:
A. *The Air Data Inertial Reference Units (ADIRUs)
B. The first officers altimeter
C. The captains BARO reference selector
D. The captains altimeter
34. Regarding the cabin pressurization panel: With illumination of the AUTO FAIL light, the
pressure control automatically transfers to:
A. The other pack controller
B. *The other auto controller (ALTN MODE)
C. The standby pack control of the affected pressure controller
35. When illuminated, the amber AUTO FAIL light on the cabin pressurization panel
indicates: (there are no other indications)
A. Pressurization control will switch to the alternate mode in 120 seconds
B. The pressurization mode selector must be positioned to ALTN to control
pressurization
C. *A dual pressurization controller failure is detected
D. The aircraft has descended before reaching the planned cruise altitude as set in the
FLT ALT indicator
36. Both air conditioning PACK switches are positioned to AUTO
A. With one pack operating, operating pack regulates to high flow
B. With both packs operating, each pack regulates to high flow
C. With both packs operating, one pack regulates to high and the other to low flow
D. *With one pack operating, operating pack regulates to high flow when in flight with
flaps up
37. While in cruise, you experience a failure of both the AUTO and ALTN modes. To make
the cabin altitude decrease
A. Turn OFF one pack
B. *Close the outflow valve
C. Turn OFF two packs
D. Open the outflow valve
38. During normal operation and in flight. What will be the reaction of the isolation valve
when one pack trips off?
A. It closes to isolate the problem
B. It opens to balance the load of the remaining pack over both engines
C. *There is no reaction of the isolation valve
39. Regarding the cabin pressurization panel: When will the amber AUTO FAIL light
illuminate?
A. *When there is a loss of DC power or a controller or outflow valve control fault
B. When there is excessive cabin differential pressure or a cabin pressurization panel
failure
C. Only when both pressurization controllers fail
D. Only when a pressurization controller fails
40. Aborting climb after takeoff and returning to the departure airport. Do you have to select
the airport's landing altitude on the cabin pressurization panel?
A. True
B. *False
41. The overboard exhaust valve serves as an exhaust for:
A. Air circulated around the forward cargo compartment
B. *The E&E compartment while on the ground and in flight with low differential
pressure
C. The recirculation fan
42. The cockpit can receive conditioned air from:
A. The left air conditioning pack through the mix manifold only
B. *The left and/or right air conditioning pack through the mix manifold
C. The right air conditioning pack through the mix manifold only
D. The left air conditioning pack only
43. Above which cabin altitude shall the intermittent cabin altitude warning horn sound?
A. 14000 feet
B. 8000 feet
C. 17000 feet
D. *10000 feet
44. Under normal circumstances, conditioned air from the right pack:
A. *Flows to the passenger cabin through the mix manifold
B. Flows to the cockpit and passenger cabin through the mix manifold
C. Flows directly to the passenger cabin
45. The APU is capable of supplying bleed air:
A. *On the ground: for two packs; in flight: for one pack
B. On the ground: for two packs; in flight: for two packs
C. On the ground: for one pack in HIGH and other pack in AUTO; in flight: for two
packs
46. Regarding pack temperature control: if both the primary and standby pack controllers fail
on the same pack:
A. The affected pack will be shut down whereby the cabin pressure will gradually
decrease to a level where adequate pressure can be sustained by the remaining pack
(FL 250)
B. *The pack will continue to operate without control unless excessive temperatures
cause the pack to trip off
C. The affected pack will be shut down automatically since no controller commands are
being received
47. What does an amber ZONE TEMP annunciation indicate? (Not on recall)
A. The temperature controller has failed and the zone temperature is now being
controlled by remaining controller
B. *The air in the related zone supply duct overheats
C. The ambient temperature in the related zone is too high
D. The trim air system is malfunctioning causing the zone temperature controller to revert
to standby pack temperatures
48. In flight, with both air conditioning packs serviceable and the recirculation fan switches
positioned to AUTO, the left circulation fan will stop operating when:
A. *Left or right pack is switched to HIGH
B. The right pack is switched to HIGH
C. The left pack is switched to HIGH
D. Both packs are switched to HIGH
49. TRIM AIR is added to air from the mix manifold to:
A. reduce pack demand
B. help maintain a constant cabin pressure
C. *control zone temperature
D. control pack temperature
50. Failure of the primary flight deck temperature control will cause an automatic switch to
the back-up control.
A. *True
B. False
51. A zone supply duct overheat will result in:
A. the closing of the associated Trim Air Modulating Valve
B. the illumination of the associated amber ZONE TEMP Light.
C. *both the closing of the associated Trim Air Modulating Valve and the illumination of
the associated ZONE TEMP Light
D. the opening of the associated Trim Air Modulating Valve after the TRIP RESET
Switch is pushed
52. If any individual zone is switched OFF, the Temperature Selector setting will be ignored
by the temperature control system
A. *True
B. False
53. How is the forward cargo compartment heated
A. *By air circulated from the equipment cooling system and/or passenger cabin
B. By air circulated from the equipment cooling system and/or flightdeck
C. By air circulated from the passenger cabin only
D. By air circulated from the flightdeck only