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Pilot Exterior Preflight
LT “Rick James” Holt
Preflight
Standard stuff…
Check for leaks, open panels and general
condition as you approach the plane.
2
HF 1
SRS
Upper Tacan
Tank 5 Drain
Mast
Vortex
Generator
Dump Chute
ASCL 2
ASCL 1
3
Left Wing
Beaver Tail
4
Beaver Tail – Venting system designed to create a cooling boundary
between engine nacelle and fuel tank
5
Left Wing
Fuel Dump Chute
Flap Position (Degrees)
6
Left Wing
Vortex Generator
7
FLAP SKID PAD
Rubbing allowed
FLAP TRACK
8
7 Static Wicks “any one off
edges, or any two- down”
9
Aileron
Trim
Cables
Aileron
Push-Pull
rod
Boost
Pump
Press
Switch
APU Filter
Boost
Pump
APU Fuel Inlet Line
#2
APU Filter Drain + man shut-off
APU Fuel Drain Valve
10
Wing Deice Hot Air
discharge louvers
Scored Surface to
prevent cracking
Blade Angle Reference
mark
11
Centroid Riser
Purpose: structural mounting of
wing
Jack Point
Engine Breather
Purpose: escaping
air/pressurize oil tank
12
Landing Gear
Emergency
Extension Cable
Flap Jackscrew
Aileron Push-Pull
Rod
Fuel Dump
Chute
Fuel
Dump
Valve
(MDC)
Transfer
Pump
Primary and
Secondary Popet
Lines
13
Flap Brake
actuation
window (Red dot
will appear in the
window if brake
set)
Flap Brake
(MDC)
Flap Torque Tube
Landing Light (MEAC)
14
Left Wing
Flap Carriage
Access Panels
Check the roll pins
for cracks
15
Left Wing
Flap Brake
Actuation Indicator
Flap Actuator
(Jack Screw)
16
Left Wing
Flap Brake
Check indicator
17
Left Wing
Flap Torque Tube
Dump Valve
Aileron Push Pull Rod
Check for scrapes
where there is no roller
Primary / Secondary Bleed Metering Lines
18
Left Wing
Flap Torque Tube
Tank 5 Fuel Vent
Aileron Push Pull Rod
19
Left Wing
Flap Asymmetry Chain
Aileron Trim Cables
20
Left Wing
Aileron Trim Cables
MLG Manual Uplock
Release Cable
Wing Plenum AntiIce Exhaust
21
Left Wing
APU Fuel Filter
APU Fuel Filter
Drain Valve
APU Manual Fuel
Shutoff Valve
22
Left Wing
Hydraulic Fluid Heat
Exchanger Lines
Landing Gear / Brake
Hydraulic Lines
23
Vents are covered with flame arrestors
Outboard Fuel Tank Vent
Inboard Fuel Tank Vent
Two #5 vent lines are interconnected and plumbed into this vent
24
Left Wing
Static Discharge Wicks
Fuel Tank Vents
25
Left Wing
Fuel Tank Vents
26
Left Wing
Landing Light
27
Left Wing
External Stores Racks
(Wing Pylons)
28
Left Wing
NACA Vent intake
for cooling air
29
Nacelles
EDC Dump Exhaust
Door (Engines 2 & 3)
check for hinge (1 &4
have no hinge)
Engine Cowl
Panel Latches
Oil Cooler Air
Scoop
30
Nacelles
Oil Cooler /
“Piccolo Tubes”
Air Exit Duct look
for birds nest
“Gang” Drain
Oil Cooler Flap
31
Nacelles
Oil Cooler Inlet
Generator Cooling Air Duct
/ Shutoff Valve …also used
to cool eng mounts
32
Nacelles
Island
Forward Spinner
Check for proper blade
angle (should see three
holes)
Cuff
Aft Spinner
33
Main Mount Wheel Well
General Items:
-Chocks
-Grounding strap
-Tires
34
Bungee Springs –
help with freefall
extension in flight
Brake Fuse 30
cubic inches of fluid
actuates shut off
Counter Measures (If Installed)
should see 1 pin per set of
buckets
Mechanical Down Lock Linkage
Lower drag strut
Look For:
Uneven Tread Wear Max
Tread Wear: When tread
pattern is worn to the bottom
of the tread groove
Flat Spotting: due to
prolonged standing
Sidewall conditions: Look for
cracks, cuts, abrasions,
bulges, gouges, cord plies
Enough tread for bounce
flight?
Fire Shield
Emergency Brake Line
Normal Brake Lines
35
Main Mount Wheel Well
Shuttle Valve
Brake Pucks (1,2,3 rule)
1. No ONE flush
2. No 2 side by side not fluxing
3. No THREE total not fluxing with brake
actuation.
36
Main Mount Wheel Well
Emergency (Air)
Hydraulic Brake Line
Normal Hydraulic
Brake Lines
37
Main Mount Wheel Well
Scissor Switch
(Weight On Wheels)
Brake Fuses check the
arrow going down toward
the deck
Automatic Safety Downlock
Linkage (Mechanical Downlock)
38
Main Mount Wheel Well
MLG Door Actuating
Cylinder
Look for Hyd leaks
39
Main Mount Wheel Well
Upper Drag Strut
Bungee Spring
Lower Drag Strut
40
Main Mount Wheel Well
Upper Jury Strut
Gear Pin
Lower Jury Strut
41
TD AMP
6. What does this
do?
Check for
excessive
fluid/leaks
Check orange
bolts for leaks
7. What does the
orange paint
mean?
Check for leaks
on the door
actuator
Check spring, this
can break
Check bolts
42
Bonding Braids(used
for grounding) (4)
Manual Landing Gear
release cable
Upper Drag
Struts
Uplock
43
Mechanical Gear
Release Cable
Swivel Joint
Gear Actuator(Behind):
Look for any hyd. fluid,
downing discrepancy
Down Lock Switch
Jury Strut
Bungee Spring
Lower Drag Strut
44
Oleo 4-5” min
Shuttle Valves
Brake Pucks:
8. Bad if ?
45
Main Mount Wheel Well
HRD Pressure Gauges
46
Main Mount
Wheel Well
“Pie Pans”
E handle cables
(normally covered)
47
Pie Pan(access
point to hot
section)
Bleed air Valve
(SEDC)
Fire Sensing
Element
E-Handle + power
lever cables
inside
Bleed Air
plumbing
EDC Plumbing
Hydrostatic Tester
case
5. Which nacelle
is this?
48
HRD Bottles (500psi Min)
HRD Discharge line
49
Main Mount Wheel Well
Pie Pans
E handle cables
(covered)
50
Nose
51
Oil Tank Access Panel
Sys Cap 15.75 gallon
Usable 8.65
foaming
space 5.7 unusable 1.4
NACA Vent
EDC Dump
Door(Sealed Shut
on 1&4)
Make sure it is secure, a common
access point for maintainers
Lab Seal- during
engine shutdown,
ports engine oil
Gang Drain, outboard engines don’t have
engine breather, use gang drain
Heat Exchanger intake vent
52
5th Stage
Discharge Port
3. Purpose?
“A” panel, make sure it is secure, a
common access point for maintainers
Lab Seal Vent (eng oil)
Oil Cooler Intake
Oil Cooler Exhaust/Door
Gang Drain
53
View from under the prop aft spinner.
It is normal to have the “X” safety
wire, also ok if it is around the
perimeter. Drain Plug for the prop
control.
54
#4 Prop
Blade(Base is scored to
prevent cracking)
Island
Forward Spinner
(Continuously
Heated during prop
deice)
Spinner Skirt
Cuff
55
Oil Cooler
Generator Cooling Door (Mechanical Function of the E-Handle) 4. Question, is
there one on #1 engine, and if so, what is the function?
56
Nose
Bomb Bay Safety
Switch / Pin
57
Nose
Air Multiplier Package
AMP Oil Level Window
58
Nose
APU Safety Switch
Port Heat Exchanger
Exhaust
59
TAS Probe
Pilot Pitot Tube
60
10. Limit?
61
Air Multiplier Turbine
(Check for cracks,
scores, obstructions,
missing blades)
62
63
Bomb Bay Safety
Pin
Hydraulic Fluid
Mechanical cut-out
64
Nose
Port Heat Exchanger Ram
Air Inlet / Aux Vent
65
Nose
TAS Probe
LH Pitot Tube
66
Nose
AIP Countermeasures
Dispenser - Nose
(Blankoff Plate shown)
67
NWS Actuator Cables
Nose
Taxi Lights
NWS Actuator Cylinder
68
Nose
Nose Wheel Steering Cylinder
Tow Bar Attachment
69
Nose
Aux Vent Valve
70
Nose
Battery
71
Nose
APU Fire Bottle
72
Nose
Optical Sensor
Converters
73
Nose
Stbd Heat Exchanger
Ram Air Inlet
Ice Detector Probe
Stbd Pitot Tube
74
UHF-1
Satcom(Batwing)
Atmospheric Vent cabin
press control
Check for no tape
SRS
ALE 47 “Bug-eye”
(OSC)
Icing probe
Copilot Pitot Tube
APU Intake Door
SRS
75
Nose
Tie Down Hardpoint
Stbd Heat Exchanger Exhaust
APU Exhaust Door
76
Fuselage
AOA
Probe
77
Right Wing
78
Right Wing
Fueling
Panel
Pressure Fueling
Connectors
79
Fuselage
Tank 5 Drain Mast
80
Fuselage
HSC
Sono Disable Door
81
Hydraulic Service Center
#2 Hydraulic Quantity
Gauge
#1 Hydraulic Quantity
Gauge
#2 Hydraulic reservoir
#1 Hydraulic reservoir
82
Hydraulic Service Center
Emergency Air
Brake Bottle
Flap Asymmetry
Valve
83
Hydraulic Service Center
Emergency Main
Landing Gear
Release Handle
Landing Gear
Control Valve
84
Hydraulic Service Center
Hydraulic Pump
85
Hydraulic Service Center
Hydraulic Pump
86
Hydraulic Service Center
87
Hydraulic Service Center
Aileron Boost Package
88
Hydraulic Service Center
Hydraulic Pressure
transmitters
Brake
Accumulator
Hydraulic Filter
89
Hydraulic Service Center
Hydraulic Filters
Hydraulic Pump
Delta P
90
Hydraulic Service Center
Hydraulic Flap
Motor
91
Fuselage
Sonobuoy Safety Switch
92
Empennage
“Hell Hole”
(Access to rudder &
aileron booster pkgs)
93
Fuselage
Wing length pic
AIP Aft
Countermeasures
Dispenser
(blankoff plate shown)
94
Fuel Cavity Vent
Fuel Cavity Vent
Fuel Cavity Vent
Tank 5 Drain Mast
95
VHF Upper
(imbedded)
UHF-2 Upper
HF-1
VOR Loop
MAD Boom(Look to
insure not bent)
Crash locator
SU-164/AAR-47 Optical
Sensor-Converter for
MWS
HF-2
Flux Valve
9. Purpose?
UHF-2 Lower
96
Force Link Tab
SRS Antenna
(Ask an O-4)
97
Sat com antenna
SRS Antenna
Head Vent
98
EBB Discharge Port(no
leakage allowed)
99
Fuel Tank
Vents(nothing should
be coming out except
air)
100
Fuselage
101
Fuselage
Port Static Ports
(plugs installed)
102
Fuselage
HF Antenna Slip Mark
103
Empennage
HF Antennas
Rudder Trim Tab
Elevator Trim Tab
Force Link Tab
104
Fuselage
“Hell Hole”
Negative Pressure
Relief Valve Air Inlet
105
The End
106