7,305 Air Conditioning (ATA 21) service difficulty reports for the Boeing 737 (all variants) — 2.8% of all reported difficulties.
Most reported components
- WARNING LIGHT 1,217
- UNKNOWN 1,147
- CONTROL VALVE 785
- CONTROLLER 474
- ACTUATOR 460
- WARNING SYSTEM 359
- MODULATING VALVE 311
- VALVE 278
- FILTER 255
- WARNING MESSAGE 211
- FAN 191
- ACM 164
- A/C PACK 159
- SENSOR 120
- OUTFLOW VALVE 111
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).