What was found
APU AIR CAUSES SMOKE AND VAPOR TO FILL THE CABIN. FOUND APU OIL COOLER INPUT-OUTPUT LINES O-RINGS DAMAGED. REPLACED APU OIL COOLER LINE O-RINGS PER AMM 49-91-41. A/COK FOR SERVICE.
- Difficulty date
- September 5, 2025
- Submitted
- September 9, 2025
- Operation
- Air carrier
- Aircraft
- N8579Z
- Make and model
- Boeing 7378H4
- Aircraft serial
- 63591
- Aircraft time
- 23,553 hours, 12,211 cycles
- System (JASC)
- 4990 · APU Oil System
- Part
- O-Ring
- Condition
- Leaking
- Location
- Apu Oil Cooler
- Stage of operation
- TX
- How discovered
- O
- Nature of condition
- K, B
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.