100 Hour Inspection Checklist

Use the 100-Hour Inspection Checklist for a deep assessment of single-engine airplane components from fuselage, to landing gear and engines.

100 Hour Inspection Checklist



Fuel System

1. Is the fuel strainer checked for internal cleanliness, security, leaks, and safety?


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2. Are the drain valve and control verified for proper rigging, operation, leaks, and security?


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3. Are the fuel tank sump drains examined for water and sediment, leaks, security, and proper safety?


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4. Are the quick-drain valves checked for proper operation?


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5. Is the underside of the wings inspected for any evidence of fuel leaks?


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6. Are the fuel tank filler cap placards verified for legibility?


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7. Are the caps inspected for leaks, and is security ensured?


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8. Are the fuel vents checked for obstructions, leaks, security, and proper position of the vent behind the wing strut?


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9. Are the fuel selector valve or shut-off valve checked for proper operation, security, leaks, and positive detent positions, and are legibility and correct indexing of the placard ensured?


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10. Are all fuel lines inspected for security, chafing, leaks, cracks, dents, kinks, and corrosion?


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11. Are fuel line and selector valve drains verified for leaks, and is safetying ensured?


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12. Are the fuel quantity gauges (direct-reading), electrical fuel quantity gauges, and fuel quantity electrical transmitters examined for security, correct indication, defective wiring, cracked glass, legibility, and leaks?


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13. Is the proper operation of the engine primer verified for proper operation and leaks?


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Landing Gear

1. Are the brakes checked for proper operation, sponginess, and failure to hold pressure, and is the fluid level adequate?


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2. Are the master cylinders, brake lines, and hoses inspected for security, leaks, cracks, dents, and chafing?


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3. Are the brake linings verified for wear, cleanliness, chips, cracks, and security?


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4. Are the brake disks checked for scoring, warping, and excessive wear, and ensure there are no loose or broken brake clips?


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5. Are the wheel and brake assembly inspected for cracks, dents, corrosion, leaks, loose bolts, defective paint, freedom of moving parts, and excessive wear?


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6. Are the axles checked for security, cleanliness, cracks, bends, and defective threads?


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7. Are the axle nuts properly adjusted and safe?


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8. Are the wheel bearings removed at tire rotation or replacement and is an inspection of cleanliness, rust, cracks, pits, scoring, brinelling, discoloration, excessive wear, and lubrication ensured?


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9. Is the main landing gear spring inspected for security, cracks, bends, deep scratches, dents, chipped or peeling paint, and loose brake lines?


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10. Are the tires verified for proper inflation, sufficient tread, cleanliness, cuts, blisters, breaks, and uneven wear?


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11. Is wheel alignment checked if tires show uneven wear?


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12. Is the tailwheel checked for lubrication, security, and cracks?


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13. Are tires checked for proper inflation, cuts, sufficient tread, breaks, and blisters?


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14. Are the tailwheel spring, steering, and anti-swivel mechanism checked for security?


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15. Is the parking brake inspected for proper operation, correct adjustment, security, and excessive wear, and ensured it fully releases?


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16. Are the P Ponk attach bolts checked for security and integrity?


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17. Is the retractable landing gear tested for physical retraction, both under normal retraction conditions and during emergency gear-down procedures?


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18. Are the retractable landing gear lights checked?


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19. Is the "in transit" light for the retractable landing gear verified?


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20. Is the gear horn on the throttle operational as intended?


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21. Is the oil in both the gearbox and the hydraulic reservoir for the retractable landing gear system verified?


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Airframe

1. Are the pitot and static ports inspected for obstructions?


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2. Are the pitot and static lines checked for security, cracks, kinks, chafing, and any signs of moisture?


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3. Is the alignment of the pitot tube checked?


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4. Is the aircraft exterior inspected for cracks, metal distortion, broken spot welds, loose or missing rivets, screws, bolts, corrosion, condition of paint, and any other apparent damage or defects and empennage tips for damage?


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5. Is the aircraft structure examined for corrosion, cracks, metal distortion, loose or missing rivets, screws, and bolts, as well as evidence of excessive loads?


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6. Are the windows and windshield inspected for cleanliness, proper attachment, sealing, crazing, cracks, deep scratches, and discoloration?


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7. Are the door, window hinges, and latches checked for lubrication, alignment, proper operation, cracks, distortion, binding, and security?


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8. Are the seats verified for ease of movement, positive locking, and security?


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9. Are the seat stops looked at?


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10. Is the seat upholstery verified for rips, tears, holes, and cleanliness?


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11. Is the seat structure verified for cracks, bends, and corrosion?


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12. Are the seat rails checked for security, cracks, and damage?


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13. Are the safety belts examined for security and proper latching, and checked for cuts, tears, fraying, and broken stitching?


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14. Are the attaching parts checked for cracks, deformed metal, and excessive wear?


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15. Is the control column checked for security, binding, cracks, looseness, and restricted travel?


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16. Are the bearings, sprockets, and pulleys verified for cleanliness, lubrication, binding, security, and excessive wear?


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17. Are the cables and chains checked for security, cleanliness, corrosion, fraying, binding, broken links, and misalignment?


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18. Are the turnbuckles properly safe?


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19. Are the bell cranks inspected for cracks, distortion, and binding?


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20. Are the control wheels verified for alignment, binding, security, a bent tube, and excessive wear?


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21. Is the control lock operating properly and readily available?


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22. Are instruments examined for cracked glass, security, proper operation, cleanliness, and legibility of markings?


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23. Are the gyro instrument air filters checked?


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24. Is the magnetic compass checked for security, fluid discoloration, leaks, and lighting, and is proper operation ensured?


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25. Is the compass card legible?


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26. Are the instrument wiring and plumbing examined for security, chafing, leaks, cracks, kinks, defective insulation, and loose terminals, and is it ensured there is no interference with control column travel?


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27. Is the instrument panel checked for security, deteriorated shock mounts, cracks, damaged decorative cover, and legibility of all decals and labeling?


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28. Are defrosting, heating and ventilating systems checked for proper operation, security, chafing, and deterioration?


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29. Are the controls rigged, free from binding, and securely fastened?


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30. Are the ram air inlets checked for obstructions?


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31. Is the cabin upholstery and trim checked for cleanliness, rips, tears, and holes, and ensuring they are securely attached?


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32. Are the sun visors checked for security and proper operation?


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33. Is the area beneath the floor inspected for cleanliness, chafing, and security of lines, hoses, and electrical wires?


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34. Are the control cables checked for any signs of fouling?


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35. Is the proper operation and security of the stall warning horn verified?


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36. Are the electrical switches, circuit breakers, and fuses checked for security, proper functioning, and the legibility of placards?


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37. Are spare fuses available?


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38. Are the instruments and cabin lights checked for proper operation, security, and cleanliness?


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39. Is the instrument light rheostat verified?


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40. Are the radios and radio controls checked?


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41. Is the battery verified for servicing, security, and corroded terminals?


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42. Are the battery cables checked for the condition of terminals, security, and any defective insulation?


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43. Is the battery box examined for cracks, corrosion, damaged mounting, and brackets?


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44. Is the vent line checked for corrosion, security, and obstructions?


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45. Is the firewall inspected for proper sealing, security of grommets and shields, checked for cracks, dents, wrinkles, loose or missing rivets, screws, or bolts, and looked for evidence of excessive loads?


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46. Are the radio antennas verified for cleanliness, security, proper connections, corrosion, and cracked housings?


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47. Are the navigation lights, landing lights, flash beacons, and strobes inspected for proper operation, security, cleanliness, and cracked glass?


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48. Are the pitot heaters verified?


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49. Are the attachment and security of the door stewards checked?


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Aileron Control System

1. Is the correct direction of movement of the ailerons verified when operated from the cabin?


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2. Are pulleys inspected for security, cleanliness, binding, misalignment, cracks, cracked or deformed pulley brackets, and chipped or broken flanges?


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3. Are cables checked for cleanliness, security of terminals, corrosion, fraying, correct tension, and safety of turnbuckles?


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4. Are bell cranks and push-pull rods verified for cleanliness, lubrication, security, binding, cracks, and distortion?


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5. Are the fairleads and cable guards inspected for security and signs of excessive wear?


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6. Is the aileron system checked for correct rigging and proper travel?


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7. Are the ailerons verified for security of attachment, smooth operation, security of balance weights, cracks, corrosion, and skin or structural damage?


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Flap Control System

1. Are the pulleys inspected for security, cleanliness, binding, misalignment, cracks, cracked or deformed pulley brackets, and chipped or broken flanges?


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2. Are cables verified for cleanliness, security of terminals, corrosion, fraying, correct tension, and safety of turnbuckles?


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3. Are bell cranks and push-pull rods checked for cleanliness, lubrication, security, binding, cracks, and distortion?


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4. Are fair leads and cable guards checked for security and excessive wear?


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5. Is the flap system examined for correct rigging and proper travel?


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6. Is the flap control lever checked for security, proper operation of latch, lubrication, and binding?


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7. Are flaps inspected for the security of attachment, smooth operation, binding rollers, cracked, bent, or loose tracks, corrosion, and skin or structural damage?


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Elevator Control System

1. Is the direction of movement for the elevators assessed for security, cleanliness, binding, misalignment, cracks, cracked or deformed pulley brackets, and chipped or broken flanges?


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2. Are the cables in the elevator system checked for cleanliness, security of terminals, corrosion, fraying, correct tension, and safetying of turnbuckles?


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3. Are the bell cranks and push-pull rods inspected for cleanliness, lubrication, security, binding, cracks, and distortion?


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4. Are fairleads and cable guards in the elevator system checked for security and excessive wear?


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5. Is the elevator system inspected to ensure correct rigging and proper travel?


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6. Are the elevators verified for security of attachment, smooth operation, security of balance weights, cracks, corrosion, and skin of structural damage?


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Stabilizer Trim Control System

1. Are pulleys and sprockets inspected for security, cleanliness, binding, misalignment, cracks, cracked or deformed brackets, and chipped or broken flanges or teeth?


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2. Are cables and chains checked for cleanliness, security of terminals, corrosion, fraying, correct tension, broken or damaged links, and safetying of turnbuckle?


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3. Are fairleads, cable guards, and chain guards verified for security and excessive wear?


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4. Is the trim control wheel checked for lubrication, cleanliness, security, binding, and operation of friction stop and position indicator?


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5. Is the indicator inspected for correct indexing and legible markings?


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6. Are stabilizer actuators inspected for security, cleanliness, lubrication, proper operation, corrosion, cracks, and excessive wear?


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7. Is the trim control system checked for correct rigging and proper travel?


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8. Is the movable stabilizer verified for security of attachment, smooth operation, cracks, corrosion, and skin or structural damage?


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Rudder Control System

1. Is the rudder examined for the correct direction of movement when operated from the cabin?


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2. Is the rudder pedal assembly inspected for binding, cleanliness, lubrication, security, cracks, bent linkage, and excessive wear?


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3. Are the pulleys checked for security, cleanliness, binding, misalignment, cracks, cracked or deformed pulley brackets, and chipped or broken flanges?


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4. Are the cables inspected for cleanliness, security of terminals, corrosion, fraying, correct tension on “closed” systems, and safetying of turnbuckles?


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5. Are fairleads and cable guards inspected for security and excessive wear?


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6. Is the rudder system inspected to ensure correct rigging and proper travel?


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7. Is the rudder inspected for security of attachment, smooth operation, security of balance weight, cracks, corrosion, and skin or structural damage?


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Emergency Locator Transmitter

1. Is the ELT checked for proper function?


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2. Do the remote “on” and “reset” buttons work correctly?


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3. Are the battery replacement dates of both the ELT and the remote switch verified?


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4. Is FAR 91.207(d) compliance ensured?


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Engine Run-Up

1. Are the engine temperatures and pressures inspected?


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2. Is the Static RPM verified?


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3. Is the magneto drop noted during inspection, paying particular attention to any differences between the drop on the two magnetos?


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4. What are the readings during the inspection :Left


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5. What are the readings during the inspection :Right


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6. What are the readings during the inspection : Difference


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7. Is the engine response to changes in power checked?


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8. Are any unusual engine noises inspected?


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9. Is the propeller response through pitch range checked?


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10. Is the fuel tank selector or shut-off valve operated on each tank and off positions long enough to ensure the valve functions properly?


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11. Are the idling speed and mixture checked?


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12. Is the proper idle cut-off checked?


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13. Is the generator warning light or ammeter looked at?


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14. Is the suction gauge inspected?


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15. Is the fuel flow indicator functioning properly?


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16. Is the magneto switch shut off at idle?


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Engine Compartment

1. Is the oil cooler checked for security, leaks, and obstructed air passages?


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2. Is the induction air filter examined?


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3. Is the entire engine assembly looked at?


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4. Is the induction air box inspected for internal cleanliness, cracks, and security?


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5. Are the doors checked for operation and sealing?


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6. Is the security and proper operation of the controls inspected?


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7. Are the cold and hot air flexible hoses checked for security, kinks, holes, chafing, and burnt spots?


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8. Is the engine baffle examined for security, sealing, cracks, metal deformation, and the attachment of sealing strips?


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9. Are the cylinders inspected for security, cracks, and broken cooling fins? Are the rocker box covers checked?


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10. Are the push rod housings inspected for security, oil leaks, cracks, and dents?


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11. Are the crankcase, oil pan, and accessory section checked for security, oil leaks, and proper safetying?


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12. Is the front crankshaft seal checked for any signs of oil leakage?


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13. Is the oil filter checked? Is there a new filter installed, if needed?


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14. Are all lines and hoses inspected for security, leaks, deteriorated hoses, and loose or corroded clamps?


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15. Are the drain lines and hoses examined for security, leaks, and any signs of chafing?


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16. Is the intake system checked thoroughly for security, leaks, deteriorated hoses, loose or corroded clamps, and any signs of chafing?


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17. Is the exhaust system inspected for security, leaks, cracks, burned-out spots, and internal flame arrester cones?


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18. Is the ignition harness examined for security, chafing, burning, defective insulation, and loose or broken terminals?


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19. Are the spark plugs checked for the proper gap, cleanliness, and evidence of reliable operation?


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20. Are the crankcase and vacuum system breather lines checked for security, obstructions, corrosion, cracks, and chafing?


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21. Are all electrical wiring in the engine compartment inspected for security, chafing, defective insulation, and loose or broken terminals?


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22. Is the vacuum pump checked for security, oil leaks, and proper safety?


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23. Is the vacuum relief valve inspected for security, cleanliness of the inlet filter, and corrosion, and is safetying ensured?


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24. Are the engine, propeller controls, and linkage checked for security, proper rigging, binding, excessive wear, cracks, misalignment, corrosion, safetying, and chafing?


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25. Are the engine shock mounts checked for security, safety, and deterioration?


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26. Is the engine mount checked for cracks, corrosion, dents, bends, and evidence of overheating?


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27. Are the ground straps looked at for security, corrosion, fraying of braided straps, and cracking of metal straps?


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28. Are the cabin heater valve and door checked for proper operation, sealing, cracks, and deformation?


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29. Are the controls inspected for security, binding, proper rigging, and alignment?


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30. Is the starter checked for security, and oil leaks, and are tight electrical connections ensured?


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31. Is the engagement lever verified for proper rigging and return spring tension?


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32. Is the alternator inspected for security, and any oil leaks if the generator is fastened to the accessory case?


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33. Are the drive belts checked for cuts, fraying, and excessive wear?


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34. Is the security of all electrical connections ensured?


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35. Is the carburetor inspected for security, cracks, corrosion, fuel leaks, and cleanliness of the inlet screen, also is proper safetying ensured?


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36. Is the engine cowling examined for cleanliness, proper fit, security, cracks, dents, cuts, tears, loose or broken hinges, defective latches or fasteners, and deteriorated paint?


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37. Are the cowl flaps checked for their condition and operation, including cleanliness, proper fit, security, cracks, dents, cuts, tears, loose or broken hinges, and deteriorated paint?


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38. Are the controls securely fastened, properly rigged, and free from any binding?


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39. Are all compressions checked?


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Magnetos

1. Are the breaker points examined for security, pits, burns, and carbon deposits?


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2. Are cam followers lubricated?


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3. Are the ventilator screens checked for cleanliness and security?


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4. Are the magnetos correctly timed to the engine and securely attached?


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Propeller

1. Are the constant-speed propellers inspected for nicks, cracks, corrosion, bends, dents, loose nuts and bolts, oil leaks, freedom of blade movement, excessive looseness of blades, security, and proper safety?


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2. Is the governor checked for security, safety, cracks, and oil leaks?


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3. Is the control verified for correct rigging, security, no binding, and proper safety?


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4. Are the spinner and spinner bulkhead inspected for cracks, dents, alignment, security, and the condition of the paint?


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Checklist by GoAudits.com – Please note that this checklist is intended as an example. We do not guarantee compliance with the laws applicable to your territory or industry. You should seek professional advice to determine how this checklist should be adapted to your workplace or jurisdiction.

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