# SDR AALA202608129232

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 23, 2026
- Submitted: August 12, 2026
- Operation: Air carrier
- Aircraft: [N908AA](https://openairdocs.org/aircraft/N908AA), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7775
- Aircraft time: 27,680 hours, 10,999 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Tube
- Condition: Coked
- Location: Apu
- Component: Apu, Honeywell, 1319A
- Component part number: 38007081
- Stage of operation: DE
- 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/AALA202608129232

## Discrepancy

AIRCRAFT WAS GROUNDED: ON DESCENT, FLIGHT ATTENDANTS REPORTED A STRONG ODOR IN THE AFT HALF OF THE CABIN. IT WAS LIKENED TO THE ODOR OF EXHAUST. IT DISSIPATED AFTER LANDING. NO ODORS WERE SMELLED IN THE FLIGHT DECK OR FORWARD HALF OF CABIN.  MAINTENANCE FOUND THE APU FCU AND LUBE MODULE LEAKING OIL OUT OF THE AFT BELLOW DRAIN PORT ALONG WITH EVIDENCE OF COKING IN THE APU GEABOX VENT TUBE AND THE AIR OIL SEPARATOR - MAINTENANCE REPLACED THE FCU PER AMM 49-32-11 - THE LUBE MODULE WAS REPLACED PER AMM 49-91-45 *AALA202608124014* - THE APU GEARBOX VENT TUBE WAS REPLACED PER AMM 49-26-55 *AALA202608129232* AND THE AIR OIL SEPARATOR WAS REPLACED PER AMM 49-26-54 *AALA202608127582* - A DECONTAMINATION OF THE ENVIRONMANTAL CONTROL SYSTEM WAS ACCOMPLISHED PER JOB CARD 26L00021014 WITH NO LEAKS OR ODORS NOTED

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