446 Fire Protection (ATA 26) service difficulty reports for the Boeing 747 — 1.6% of all reported difficulties.
Most reported components
- FIRE WARNING 80
- SMOKE DETECTOR 57
- CIRCUIT CARD 42
- FIRE LOOP 33
- FIRE DETECTOR 27
- WARNING MESSAGE 17
- EXTINGUISHER 14
- FIRE BOTTLE 13
- WIRE 12
- SMOKE WARNING 11
- SQUIB 11
- WARNING SYSTEM 10
- CONNECTOR 10
- NONE 10
- RELAY 9
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).