# SDR AALA202111040609

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 28, 2021
- Submitted: November 4, 2021
- Operation: Air carrier
- Aircraft: [N122NN](https://openairdocs.org/aircraft/N122NN), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6252
- Aircraft time: 23,268 hours, 6,786 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Cooling Fan
- Condition: Leaking
- Location: Apu
- Component: Apu, Hnywl, 1319A
- Component part number: 38007081
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202111040609

## Discrepancy

AIRCRAFT WAS GROUNDED: FUME EVENT OCCURRED PASSING FL 180 250 KNOTS AND CONTINUED TO 12,000. SEEMED TO CLEAR BUT STARTED AGAIN ON DESCENT TO LANDING. MAINTENANCE ISOLATED SOURCE OF ODOR TO THE APU. **SUPPLEMENTAL REPORT FOR AALA202111010609: MAINTENANCE FOUND THE APU OIL COOLING FAN LEAKING DUE TO A BROKEN SEAL. REPLACED SEAL AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 49-52-51** (CLOSED)

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