53 Pneumatic (ATA 36) service difficulty reports for the Boeing 747 — 0.2% of all reported difficulties.
Most reported components
- CONTROLLER 10
- SHUTOFF VALVE 8
- WARNING LIGHT 4
- DUCT 4
- VALVE 4
- SEAL 2
- SENSOR 2
- UNKNOWN 2
- PNEUMATIC SYSTEM 2
- CONNECTOR 2
- WIRE 1
- PRESSURE SWITCH 1
- RELIEF VALVE 1
- B-NUT 1
- PRIORITY VALVE 1
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).