HSL 41 Preflight
Preflight “Gouge”
• This is a guide to assist you in you preflight
and identification of components.
• This is not a substitute of NATOPS.
OBJECTIVES
• Preflight Requirements
• What to look for
• CAUTIONS, WARNINGS, & NOTES
BEFORE YOU START...
• Thoroughly check the ADB
(Aircraft Discrepancy Book)
• Are the Daily and
Turnaround Inspections
properly completed and up
to date?
• Fuel Samples?
Oil Consumption?
• Are there any gripes that
catch your eye?
NATOPS CHAPTER 7
• 7.2 PREFLIGHT
– Prior to flight, the pilot in command shall
ensure that a complete visual check of the
helicopter has been conducted.
– The aircrew preflight inspection may be divided
among pilot, ATO, and Sensor Operator.
PREFLIGHT YOUR
EQUIPMENT
• Flight Suit (dog tags?)
– Make sure you are FOD free
• Helmet
– Lip light? Clean Visors?
• Gloves
– No holes
• Flashlight
NATOPS CHECKLIST
• Use NATOPS checklist items as a minimum.
– Preflight with other HACs and ask questions!
– Talk to other pilots, aircrew, and maintainers for
what they look for.
• Perform a daily and turnaround to see what our
maintainers are looking for.
• Inspect with extra concern areas that have
recently been worked on or that have
outstanding or recurring gripes in the ADB.
GETTING STARTED
• Initial walk around
– Look at the aircraft for anything that looks out of
place.
– “Man, that just ain’t right!”
• Are tie downs, plugs, and covers still installed?
• Leakage
– Is there any noticeable oil or fuel on the ground?
– Is fluid running down the side, underside, or tail?
WHEN IN DOUBT
• If something doesn’t look right, ask!
• To call a troubleshooter use (DEMOT): Make a “T”
signal with both hands followed by a number.
T-1 = AD, T-2 = AE, T-3 = AM, T-4 = AO, T-5 = AT
AD
AE
AM
AO
AT
DOWNING AN AIRCRAFT
• If you don’t feel it is safe, don’t fly it!
• Maintenance Control can tell you if a gripe
is up or down by checking the MIM’s
(Maintenance Instruction Manuals).
• QA is always there to help.
– Make sure the question is answered to your
satisfaction!
PREFLIGHT…..
NATOPS ITEMS
ADDITIONAL ITEMS
Seat Harness
ELT
Seat Track
FLIR HCU
Flight Controls
Wave Guide
Bottles
Selector Valve
WPS- Select A or B
Radar Pressure Pop out
Nose Bay
Door Seal
TACAN Antenna
KIT 1C
Mount
Windshield Wipers
Temperature Sensors
UHF 2
Laser Enable/
Disable, Gimble Switch
Displacement Gyros NSIU
Pitot Tube
ECA
FLIR Turret
Unit
AFCS
RADOME
ESM ACU
Turn Rate Gyros
Ground
AAR-47
Data Link Antenna
Search/Hover Lights
ESM
Antenna
RADALT Antennas
Drive Shaft Covers
Electrical Equipment
Compartment
Water wash
Static
Ports
WOW
Door
Switch
Gravity
Refuel
SO Window Sonobuoy
Launcher
Engine
Exhaust
APU
Exhaust
ESM
Antenna
Pylons and
Pressure
Stores
Refuel
Avionics Cooling
Exhaust
Position
Light
Ext ICS
Arm Panel
Fire Extinguisher
Thermal Plug
Anticollision
Light
Sonobuoy
Antenna
Check all underside panels are secure.
Strut
Grounding Wire
(Hidden)
Brake Lines
Brake PUK Indicators
Tire Condition
Lock Lever in unlocked
position. Check up in locked
position.
Strut Condition
Grounding Wire
Tire Condition
Shimmy Dampner
Tail Grounding Wire
Slip Marks
Tail Probe
Lower
Anti-collision Light
UHF/TACAN
Antenna
Block I, UHF/VHF/TACAN
Antenna
Data Link
Antenna
Pylon Fold Hinges
Lockpin
Keeper
Oil Cap
IGB Cowling
Cap Lock
Oil Level
Stab Lockpins
Keeper
Tail Bumper
Stabilator
Isolator
Mount
Position
Sensor
Arm
Actuator
Arm/Rod
Forward Spar Web
Forward Spar
Anti Collision Light
Position Light
AAR-47
Stab Position Link
Stab Actuator
Static Wicks
De-Ice Harness
Pitch Change
Links
Bonding Wire
Indexer
Retracted
Pitch Change Shaft
Pitch Beam
Tail Rotor Blades
TGB Oil Cap
Balancing
Weight Location
TGB Cowling
Pitch Beam
Retainer Nut
Tail Rotor
Spring
Cylinders
Anti-collision
Light (Note: screw
installed in top of
upper light,
not installed
on lower light, to
allow water to drain)
Blade
Boot
Tail Rotor
Quadrant
Flexible
“Thomas”
Coupling
Tail Rotor
Servo
Number 6
Driveshaft
Centering
Springs
Cable and Pulley
(each side of Quadrant)
Hydraulic Lines
Tail Rotor - Cont.
Pitch Beam
Retainer Nut
Index Actuator
Indexer
shown in
extended
position.
Check retracted
Pitch Change
Beam
Blade De-ice
Connector
Pitch Change
Shaft
Chip Detector Retaining Ring
Abrasion strips and de-ice boots
TGB Oil Level
T/R Tip Cap
Disconnect Jaws
Tail Driveshaft
Disconnect Spring
Thomas Coupling
Viscous Damper
Underside of blades
4
5 6
Critical Fasteners
Transition Section
Tail Cone
(Thermal Barrier removed)
Accumulator
Dump Valve
Tail Strut
APU Accumulator
ECS Duct
Looking forward, above fuel cell
Premature Breakaway Indicator
Fuel Lines &
Breakaway valves
Dehydrator Kit
Doppler Antenna
(under platform)
Ice Detector
(hidden)
ECS
Exhaust
Rescue
Hoist
ECS
Intake
Avionics Cooling
Inlet
Mirror
HF
Antenna
Cabin Door
MAD Reeling
Machine and
Towed Body
Pylon and
Stores
External Power
Receptacle Access
Float bag
Fairing
Main Landing Gear
Drag Beam
Sono Launcher Bottle
RAST Backup
Messenger Cable
Distributor Lock
First Aid
Kit
Crash Axe
Hoist
Pendant
APU Pump
Handle
Fire
Extinguisher RAST
Equipment
Sono Launcher
Selector Valve
APU Accumulator
Pump (manual)
Cabin
HIFR Pressure
HIFR Go-No-Go Gauge
Filter
APU Accumulator
Pressure Gauge
ECS Duct
APU Pump Handle
APU Accumulator
Nitrogen Charge
APU ESU
APU Accumulator
Min 2650 PSI
Winterization Kit
Xsmn PDI
Hover Grip
Rescue Station
Hoist Shear Cover
RAST Manual
Release
RAST Machine
ICS cord
Fire Extinguisher
Hoist Pendant
RAST Reeling
Machine
First Aid Kit
Ratchet
Canteen
NATOPS
Hydraulics Bay - cont.
Yaw Trim
Servo
Back-up
Hydraulic
Pump
Collective
Trim Servo
Roll Trim
Servo
Pitch
Bias
Actuator
(PBA)
Pitch Trim
Servo
Avionics
Cooling
Inlet
Pressure
Reducer
Failure Indicator
Hydraulics Bay - cont.
SAS
Actuator
Boost
Servo
SAS
Retaining
Nut
Redundant
Link
Forward
Hydraulics Bay - cont.
Torque Shaft Lever
Upper Support
Bearings (under
boots)
Hydraulics Bay - Cont.
Back-up Pump Motor
No. 1
Transfer
Module
Lateral
Primary
Servo
Aft
Primary
Servo
Blade Fold
Transducers
Forward
Primary Servo
Imperfect
Threads
Mixing
Assembly/Unit
Hydraulics Bay - Cont.
#2 AC Generator
“Coffee Can”
Hydraulic Reservoir
Accessory
Module
#2 Hydraulic
Pump
Quick Disconnects
Hydraulic
Selector Valve
Filter Bypass
Popout Buttons
Bleed valve
Check for:
Mated
white paint
stripe
Temperature
Dots
Hydraulic
Transfer
Module
Load Demand Spindle
(LDS) Cable
Roll pin
and safety
wire
Main Rotor Head
Hydraulic Damper Hose
BIFILAR
Absorber
Weight
Blade
Lockpin
Pullers
Pitch Lock
Motor
(pins, 2 per
blade, shown
retracted into
housing)
Pitch
Horn
Pitch
Lockpin
PCR
Elastomeric
Bearing
Damper
Pitch Change Rod (PCR)
Droop Stop
Droop Stop
Heater Connector
Thrust
Elastomeric
Bearing
(viewed through
hub cutouts with
mirror)
Main Rotor Head - cont.
Anti-flap Cam
Spherical
Elastomeric
Bearing
(backside
viewed
through hub
cutouts
using mirror
BIM Indicator
Pitch Lock Pins
Main Rotor Blade
Elastomeric Bearing
BIFILAR
Absorber
Weight
Balance Weight
Attachment Arm
Blade Fold Lock Pins
Top of Blades
Anti-Flap Stop
BIM Indicator
Blade Fold Motor
Main Rotor
Hub Assembly
Damper
Anti-Flap Stop
Pitch Change Horn
Pitch Lock Actuator
Droop Stop
Heated Droop
Stop Harness
PCRs
Accumulator Pressure
1200 PSI minimum
Lower Pressure Plate
Rotating Scissors
Swashplate
Forward Xmsn/Rotor
Oil Filler Cap
Xmsn Dip Stick
Gust Lock Indexer
Rotor Brake Disc
Aft Xmsn/Rotor
Pitch Control Rod
New with
elastomeric bearing
OLD Pitch
Control Rod
Transmission Oil Cooler Access
Rotor Brake
Scissors
Indexer / Gust Lock
Spark Shield
Brake Disk
Rotor Brake
Accumulator
No. 1
Driveshaft
Fuel Lines
(Crossfeed)
APU AIR
SOURCE
Crossbleed Air Lines
Wear Indicator Pins
Driveshaft
Flexible
Couplings
Fuel Selector
Cables
(from Cockpit)
Fuel Selector
Valve
XMSN
Oil Cooler
Blower / Fan
Fire
Extinguisher
Line
Transmission (XMSN) Oil Lines
Engine Compartment
Fire Detector
(1 of 2)
Starter Oil
Reservoir
Cap
Starter
Fire
Extinguisher
Port (1 of 3)
Bleed Air
(crossbleed)
Hydro Mechanical Unit
(HMU)
Power Available Spindle
(PAS) Rotary Input
Load Demand Spindle
(LDS) Rotary Input
Engine Compartment - cont.
Fuel Line
Oil Filter
HMU
Fuel Oil
Heat Exchanger
Overspeed &
Drain Valve
Fire
Extinguisher
Port (2 of 3)
Bleed Air Clamp
(Inlet Anti-ice)
Filter
Popout
Button
Fuel
Filter
Fuel Pressure Switch
Engine Compartment - cont.
History Recorder
Fire Detector
Fire
Extinguisher
Port (3 of 3)
Oil Cap
Mount Strut
Inlet Particle Separator
(IPS)
Fire Detector
(2 of 2)
Electrical Control Unit
(ECU)
Engine Compartment - cont.
Combustion
Section
Mount
Struts
Deswirl Duct Clamp
Engine Compartment - cont.
Viewed from port side
IPS Blower
Check pins
(1 of 2, the other is
out of view behind
bleed air line)
Bleed air
(anti-ice)
HMU Variable
Geometry (VG)
servo
High Speed
Shaft
Input
Module
Gimbal
Oil Filler Cap
Oil Level
Variable Geometry Vane Links and Pins
5th State Bleed Air Port
Engine Anti-Ice &
Start Bleed Valve
Fire Detector
ECU
DECU
Inlet
Missing Deswirl Vanes
APU
Oil cap
Bleed air
APU
Generator
Combustor
Bleed air
Exhaust
Pipe
Starter
Fire Detector
(1 of 1)
Inlet Screen
Heat
Exchanger
Plenum
Camber
Combustion Section
Air Cycle
Machine
Air Inlet
Oil Cap/Level
J-Tube
(Hidden)
Water
Separator
Modulating Valve
Hydraulic
Starter
Fuel Control
Generator
Thomas Coupling (Hidden)
ECS Compartment
Forward
Air Cycle
Machine
Number 2
Driveshaft
Modulating J-tube
Valve
J-tube clamp
Fire
Extinguisher
Line
Tail Drive Shaft
Thomas Couplings
Fire Bottles
12
Upper UHF/VHF
Antenna
ELT Antenna
L
A
T
C
H
E
S
Outside Air
Temperature (OAT)
Sensors
Antennas
“Disco-ball”
ALQ-144
IR Jammer
Mount
TACAN
Antenna
“Fisheyes”
AAR-47
Missile Detectors
Forward
Datalink
ESM
Lower
IFF
Cargo Hook
RAST Probe
ADF
port
Main RAST
Probe light
Radome
Starboard
Mainmount
Hover/Rescue
Light
Chaff/Flare
ALE-39
Dispenser Mount
Pilot & ATO
compasses
AFT
Datalink Flux-valves
Sonobuoy
Tail RAST
Probe electrical
Sonobuoy connector
UHF/VHF/TACAN
Doppler
Fuel Dump
Pipe
Antennas - cont.
Rotor Head
Light
Upper
“Disco-ball”
ALQ-144
IR Jammer
Mount
Cut outs for
ALQ-144
Electrical
Wires
UHF/VHF/IFF
GPS
Emergency
Locator
Transmitter
(ELT)
HF
Longwire