44 Engine Oil (ATA 79) service difficulty reports for the Boeing 747 — 0.2% of all reported difficulties.
Most reported components
- TRANSMITTER 7
- PRESSURE SWITCH 4
- O-RING 3
- WIRE 3
- CONNECTOR 3
- OIL SYSTEM 3
- MANIFOLD 2
- UNKNOWN 2
- NONE 2
- OIL FILTER LIGHT 1
- SWITCH 1
- WARNING SYSTEM 1
- #4 ENG 1
- FILTER 1
- INDICATOR 1
Report counts reflect fleet size and reporting activity, not relative safety or reliability. Source: FAA Service Difficulty Reporting System (public domain).