1. Pilot Exterior Preflight
LT “Rick James” Holt
Preflight

2. Standard stuff…
Check for leaks, open panels and general condition as you approach the plane.

3. HF 1
SRS
Upper Tacan
Tank 5 Drain Mast
Dump Chute
Vortex Generator
ASCL 2
ASCL 1

4. Left Wing
Beaver Tail

5. Beaver Tail – Venting system designed to create a cooling boundary between engine nacelle and fuel tank

6. Flap Position (Degrees)
Left Wing
Fuel Dump Chute
Flap Position (Degrees)

7. Left Wing
Vortex Generator

8. FLAP SKID PAD
Rubbing allowed
FLAP TRACK

9. 7 Static Wicks “any one off edges, or any two- down”

10. Boost Pump Press Switch APU Filter Boost Pump APU Fuel Inlet Line #2
Aileron Trim Cables
Boost Pump Press Switch
APU Filter
Boost Pump
APU Fuel Inlet Line #2
Aileron Push-Pull rod
APU Filter Drain + man shut-off
APU Fuel Drain Valve

11. Wing Deice Hot Air discharge louvers
Scored Surface to prevent cracking
Blade Angle Reference mark

12. Purpose: structural mounting of wing
Centroid Riser
Purpose: structural mounting of wing
Jack Point
Engine Breather
Purpose: escaping air/pressurize oil tank

13. Landing Gear Emergency Extension Cable
Flap Jackscrew
Fuel Dump Chute
Fuel Dump Valve (MDC)
Aileron Push-Pull Rod
Primary and Secondary Popet Lines
Transfer Pump

14. Flap Brake actuation window (Red dot will appear in the window if brake set)
Flap Brake (MDC)
Flap Torque Tube
Landing Light (MEAC)

15. Left Wing
Flap Carriage Access Panels
Check the roll pins for cracks

16. Left Wing
Flap Brake Actuation Indicator
Flap Actuator (Jack Screw)

17. Left Wing
Flap Brake
Check indicator

18. Left Wing Flap Torque Tube Dump Valve Aileron Push Pull Rod
Check for scrapes where there is no roller
Primary / Secondary Bleed Metering Lines

19. Left Wing
Flap Torque Tube
Tank 5 Fuel Vent
Aileron Push Pull Rod

20. Left Wing
Flap Asymmetry Chain
Aileron Trim Cables

21. Left Wing Aileron Trim Cables MLG Manual Uplock Release Cable
Wing Plenum Anti-Ice Exhaust

22. Left Wing APU Fuel Filter APU Fuel Filter Drain Valve
APU Manual Fuel Shutoff Valve

23. Left Wing Hydraulic Fluid Heat Exchanger Lines
Landing Gear / Brake Hydraulic Lines

24. 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

25. Static Discharge Wicks
Left Wing
Static Discharge Wicks
Fuel Tank Vents

26. Left Wing
Fuel Tank Vents

27. Left Wing
Landing Light

28. Left Wing
External Stores Racks
(Wing Pylons)

29. NACA Vent intake for cooling air
Left Wing
NACA Vent intake for cooling air

30. Engine Cowl Panel Latches
Nacelles
EDC Dump Exhaust Door (Engines 2 & 3) check for hinge (1 &4 have no hinge)
Engine Cowl Panel Latches
Oil Cooler Air Scoop

31. Nacelles Oil Cooler / “Piccolo Tubes”
Air Exit Duct look for birds nest
“Gang” Drain
Oil Cooler Flap

32. Nacelles Oil Cooler Inlet
Generator Cooling Air Duct / Shutoff Valve …also used to cool eng mounts

33. Check for proper blade angle (should see three holes)
Nacelles
Island
Forward Spinner
Check for proper blade angle (should see three holes)
Cuff
Aft Spinner

34. Main Mount Wheel Well
General Items:
Chocks
Grounding strap
Tires

35. Bungee Springs – help with freefall extension in flight
Counter Measures (If Installed) should see 1 pin per set of buckets
Brake Fuse cubic inches of fluid actuates shut off
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

36. 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.

37. Main Mount Wheel Well Emergency (Air) Hydraulic Brake Line
Normal Hydraulic Brake Lines

38. 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)

39. MLG Door Actuating Cylinder
Main Mount Wheel Well
MLG Door Actuating Cylinder
Look for Hyd leaks

40. Main Mount Wheel Well
Upper Drag Strut
Bungee Spring
Lower Drag Strut

41. Main Mount Wheel Well
Upper Jury Strut
Gear Pin
Lower Jury Strut

42. Check orange bolts for leaks 7. What does the orange paint mean?
TD AMP
6. What does this do?
Check for excessive fluid/leaks
Check for leaks on the door actuator
Check spring, this can break
Check bolts

43. Bonding Braids(used for grounding) (4)
Manual Landing Gear release cable
Upper Drag Struts
Uplock

44. 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

45. Oleo 4-5” min
Shuttle Valves
Brake Pucks:
8. Bad if ?

46. Main Mount Wheel Well
HRD Pressure Gauges

47. E handle cables (normally covered)
Main Mount Wheel Well
“Pie Pans”
E handle cables (normally covered)

48. Pie Pan(access point to hot section)
Fire Sensing Element
Pie Pan(access point to hot section)
E-Handle + power lever cables inside
Bleed air Valve (SEDC)
Bleed Air plumbing
Hydrostatic Tester case
5. Which nacelle is this?
EDC Plumbing

49. HRD Bottles (500psi Min)
HRD Discharge line

50. E handle cables (covered)
Main Mount Wheel Well
Pie Pans
E handle cables (covered)

51. Nose

52. Sys Cap 15.75 gallon Usable 8.65 foaming space 5.7 unusable 1.4
Oil Tank Access Panel
Sys Cap gallon Usable 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

53. 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

54. View from under the prop aft spinner
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.

55. Blade(Base is scored to prevent cracking)
#4 Prop
Blade(Base is scored to prevent cracking)
Island
Forward Spinner (Continuously Heated during prop deice)
Spinner Skirt
Cuff

56. 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?

57. Bomb Bay Safety Switch / Pin
Nose
Bomb Bay Safety Switch / Pin

58. Air Multiplier Package
Nose
Air Multiplier Package
AMP Oil Level Window

59. Port Heat Exchanger Exhaust
Nose
APU Safety Switch
Port Heat Exchanger Exhaust

60. TAS Probe
Pilot Pitot Tube

61. 10. Limit?

62. Air Multiplier Turbine (Check for cracks, scores, obstructions, missing blades)

64. Hydraulic Fluid Mechanical cut-out
Bomb Bay Safety Pin

65. Port Heat Exchanger Ram Air Inlet / Aux Vent
Nose
Port Heat Exchanger Ram Air Inlet / Aux Vent

66. Nose
TAS Probe
LH Pitot Tube

67. Nose
AIP Countermeasures Dispenser - Nose
(Blankoff Plate shown)

68. NWS Actuator Cables
Nose
Taxi Lights
NWS Actuator Cylinder

69. Nose Wheel Steering Cylinder
Tow Bar Attachment

70. Nose
Aux Vent Valve

71. Nose
Battery

72. Nose
APU Fire Bottle

73. Optical Sensor Converters
Nose
Optical Sensor Converters

74. Stbd Heat Exchanger Ram Air Inlet
Nose
Stbd Heat Exchanger Ram Air Inlet
Ice Detector Probe
Stbd Pitot Tube

75. Atmospheric Vent cabin press control
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

76. Stbd Heat Exchanger Exhaust
Nose
Tie Down Hardpoint
Stbd Heat Exchanger Exhaust
APU Exhaust Door

77. Fuselage
AOA Probe

78. Right Wing

79. Pressure Fueling Connectors
Right Wing
Fueling Panel
Pressure Fueling Connectors

80. Fuselage
Tank 5 Drain Mast

81. Fuselage
HSC
Sono Disable Door

82. Hydraulic Service Center
#2 Hydraulic Quantity Gauge
#1 Hydraulic Quantity Gauge
#2 Hydraulic reservoir
#1 Hydraulic reservoir

83. Hydraulic Service Center
Emergency Air Brake Bottle
Flap Asymmetry Valve

84. Hydraulic Service Center
Emergency Main Landing Gear Release Handle
Landing Gear Control Valve

85. Hydraulic Service Center
Hydraulic Pump

86. Hydraulic Service Center
Hydraulic Pump

87. Hydraulic Service Center

88. Hydraulic Service Center Aileron Boost Package

89. Hydraulic Service Center
Hydraulic Pressure transmitters
Brake Accumulator
Hydraulic Filter

90. Hydraulic Service Center
Hydraulic Pump
Hydraulic Filters
Delta P

91. Hydraulic Service Center
Hydraulic Flap Motor

92. Sonobuoy Safety Switch
Fuselage
Sonobuoy Safety Switch

93. (Access to rudder & aileron booster pkgs)
Empennage
“Hell Hole”
(Access to rudder & aileron booster pkgs)

94. Fuselage Wing length pic AIP Aft Countermeasures Dispenser
(blankoff plate shown)

95. Fuel Cavity Vent
Fuel Cavity Vent
Fuel Cavity Vent
Tank 5 Drain Mast

96. MAD Boom(Look to insure not bent) Crash locator
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

97. Force Link Tab
SRS Antenna
(Ask an O-4)

98. SRS Antenna
Sat com antenna
Head Vent

99. EBB Discharge Port(no leakage allowed)

100. Fuel Tank Vents(nothing should be coming out except air)

101. Fuselage

102. Fuselage
Port Static Ports
(plugs installed)

103. Fuselage
HF Antenna Slip Mark

104. Empennage
HF Antennas
Rudder Trim Tab
Force Link Tab
Elevator Trim Tab

105. Negative Pressure Relief Valve Air Inlet
Fuselage
“Hell Hole”
Negative Pressure Relief Valve Air Inlet

106. The End