334 Pneumatic (ATA 36) service difficulty reports for the Boeing 727 — 0.6% of all reported difficulties.
Most reported components
- CLAMP 104
- DUCT 96
- VALVE 20
- SHUTOFF VALVE 7
- COUPLING 6
- GASKET 6
- CLAMPS 6
- REGULATOR 5
- LINE 5
- SENSE LINE 3
- FLEX LINE 3
- CHECK VALVE 3
- MODULATING VALVE 3
- WARNING LIGHT 3
- 13TH STAGE VALVE 3
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).