984 Auxiliary Power Unit (APU) (ATA 49) service difficulty reports for the Bombardier CRJ (all variants) — 0.6% of all reported difficulties.
Most reported components
- APU 333
- OIL SYSTEM 37
- OIL COOLER 29
- STRUCTURE 28
- O-RING 25
- LINE 25
- HEAT SHIELD 21
- PRESSURE SWITCH 21
- DUCT 20
- FUEL LINE 20
- WARNING SYSTEM 18
- UNKNOWN 16
- FUEL CONTROL 15
- ECU 13
- SOLENOID VALVE 13
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).