139 Navigation (ATA 34) service difficulty reports for the Boeing 747 — 0.5% of all reported difficulties.
Most reported components
- FMC 17
- ADC 15
- COMPUTER 10
- CONTROL PANEL 7
- PITOT TUBE 6
- ANTENNA 5
- CDU 5
- TRANSCEIVER 5
- SCANNER 5
- INDICATOR 4
- RADAR 4
- TRANSPONDER 4
- AOA 4
- SENSOR 3
- DRIVE ASSY 3
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).