323 Auxiliary Power Unit (APU) (ATA 49) service difficulty reports for the Boeing 777 (all variants) — 1.2% of all reported difficulties.
Most reported components
- APU 83
- STARTER 27
- CONTROLLER 23
- SENSOR 17
- ENGINE 12
- BATTERY 10
- VALVE 10
- ACTUATOR 7
- UNKNOWN 7
- CHARGER 6
- DUCT 6
- CHECK VALVE 5
- SEAL 5
- MOTOR 5
- OIL SYSTEM 5
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).