# SDR AALA202605052817

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 1, 2026
- Submitted: May 5, 2026
- Operation: Air carrier
- Aircraft: [N177US](https://openairdocs.org/aircraft/N177US), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 1517
- Aircraft time: 78,565 hours, 30,563 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Lubrication Unit
- Condition: Leaking
- Location: Apu
- Component: Apu, Hnywl
- Stage of operation: CL
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202605052817

## Discrepancy

AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORT THAT THERE WAS A PLASTIC BURNING ODOR COMING FROM ROWS 11 TO 30. MOST PROMINENT DURING TAKEOFF AND DESCENT.  MAINTENANCE FOUND THE APU LEAKING AND REPLACED THE FCU PER AMM 49-32-11 AND THE LUBE MODULE PER AMM 49-91-45.

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