341 Hydraulic Power (ATA 29) service difficulty reports for the Airbus A321 (all variants) — 0.9% of all reported difficulties.
Most reported components
- HYDRAULIC LINE 65
- PUMP 45
- PRESSURE SWITCH 27
- LINE 21
- HYDRAULIC SYSTEM 15
- UNKNOWN 12
- SWITCH 10
- HOSE 8
- ACCUMULATOR 8
- PACKING 8
- NONE 8
- DRAIN VALVE 7
- PTU 7
- O-RING 7
- VALVE 7
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).