887 Hydraulic Power (ATA 29) service difficulty reports for the Boeing 737 (all variants) — 0.3% of all reported difficulties.
Most reported components
- PUMP 339
- HYDRAULIC LINE 55
- HYDRAULIC SYSTEM 51
- FILTER 44
- LINE 43
- MODULE 29
- O-RING 28
- HOSE 25
- TRANSMITTER 22
- CONNECTOR 18
- UNKNOWN 17
- PRESSURE SWITCH 13
- RESERVOIR 13
- PACKING 12
- FUSE 10
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).