1,943 Air Conditioning (ATA 21) service difficulty reports for the Boeing 757 — 2% of all reported difficulties.
Most reported components
- UNKNOWN 438
- FAN 265
- CONTROLLER 144
- DUCT 95
- A/C PACK 73
- ACM 72
- FILTER 68
- ODOR 63
- CONTROL VALVE 61
- COOLING FAN 55
- VALVE 51
- SENSOR 43
- OUTFLOW VALVE 42
- CLAMP 24
- HEAT EXCHANGER 24
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).