Additional performance rules for inspections

This regulation sets specific requirements for how inspections must be performed. Anyone conducting an inspection required by Parts 91, 125, or 135 must verify the aircraft meets all airworthiness requirements and follow the approved inspection program procedures when applicable.

For rotorcraft inspections under Part 91, inspectors must examine drive shafts, main rotor transmission gearbox, main rotor and center section, and auxiliary rotors according to the manufacturer's maintenance manual.

Annual and 100-hour inspections require using a checklist that covers the items in Appendix D. Before returning a reciprocating-engine aircraft to service, the inspector must run the engine(s) to verify proper power output, magneto operation, fuel and oil pressure, and temperatures. Turbine aircraft require an engine run after annual, 100-hour, or progressive inspections.

Progressive inspections begin with a complete aircraft inspection, followed by scheduled routine (visual) and detailed (thorough with disassembly) inspections. When away from the normal inspection station, appropriately rated mechanics, repair stations, or manufacturers may perform these inspections using the regular procedures.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*