What was found
AIRCRAFT 5050, STARTING APU, WE TURNED APU BLEED ON AND AS SOON AS APU PACK AIR CAME ON AND OIL SMELL BURNING FROM COCKPIT VENTS. CORRECTIVE ACTION: REPLACED APU. (LP8139162, 1323700)
- Difficulty date
- November 28, 2025
- Submitted
- December 2, 2025
- Operation
- Air carrier
- Aircraft
- N550DN
- Make and model
- Airbus A321271NX
- Aircraft serial
- 11734
- Aircraft time
- 8,625 hours, 2,083 cycles
- System (JASC)
- 4990 · APU Oil System
- Part
- Oil System
- Condition
- Leaking
- Location
- Apu
- Stage of operation
- IN
- How discovered
- O
- Nature of condition
- K, B
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.