707 Auxiliary Power Unit (APU) (ATA 49) service difficulty reports for the Boeing 757 — 0.7% of all reported difficulties.
Most reported components
- APU 157
- STARTER 36
- ECU 30
- STRAP 20
- OIL SYSTEM 19
- DUCT 18
- VALVE 17
- ACTUATOR 17
- EXCITER 16
- SWITCH 15
- SENSOR 15
- SKIN 15
- CONTROLLER 13
- UNKNOWN 12
- RELAY 11
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).