What was found
AIRCRAFT WAS GROUNDED: SOF EVENT AFTER TAKEOFF, THEN DISSIPATED MIC 1580902. MAINTENANCE DETERMINED APU WAS SOURCE OF ODOR AND REPLACED APU IAW J/C 26L31049003.
- Difficulty date
- October 6, 2025
- Submitted
- October 10, 2025
- Operation
- Air carrier
- Aircraft
- N521UW
- Make and model
- Airbus A321231
- Aircraft serial
- 3944
- Aircraft time
- 52,598 hours, 20,179 cycles
- System (JASC)
- 4920 · APU Core Engine
- Part
- Apu
- Part number
- 38007081WGEN
- Part serial
- P3760
- Condition
- Odor
- Location
- Zone 100
- Part time
- 42,735 hours, 20,000 cycles
- Stage of operation
- CL
- How discovered
- O
- Nature of condition
- B
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.