Service difficulty reports

This regulation requires Part 135 operators (commuter and on-demand air carriers) to report specific mechanical failures, malfunctions, and defects to the FAA. The rule lists 16 specific reportable events, including in-flight fires, engine shutdowns, structural damage requiring major repair, brake failures while moving on the ground, and any situation requiring emergency action in flight.

Reports must cover each 24-hour period (starting at 0900 local time) and be submitted to the FAA in Oklahoma City within 96 hours. Operators must also report any other failure they believe endangered or could endanger safe operations, even if not specifically listed.

The regulation defines "during flight" as wheels-up to wheels-down. Reports must include aircraft identification, the nature of the problem, parts involved, and apparent cause—even if complete information isn't yet available. Additional information must be submitted as supplements when it becomes available. This system helps the FAA identify safety trends across the industry.

*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.*