336 Flight Controls (ATA 27) service difficulty reports for the Boeing 747 — 1.2% of all reported difficulties.
Most reported components
- UNKNOWN 41
- ACTUATOR 32
- PDU 28
- FLAP 16
- TRANSMITTER 14
- FLAP SYSTEM 11
- CONTROL CABLE 11
- MOTOR 10
- CONTROL UNIT 9
- WARNING MESSAGE 9
- WIRE 8
- RVDT 8
- TRANSMISSION 6
- WARNING SYSTEM 6
- COVER 6
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).