# SDR AALA202110295198

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 26, 2021
- Submitted: October 29, 2021
- Operation: Air carrier
- Aircraft: [N552UW](https://openairdocs.org/aircraft/N552UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 4957
- Aircraft time: 32,283 hours, 12,115 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Cooling Fan
- Part number: 361614011
- Part serial: P1669C
- Condition: Leaking
- Location: Apu
- Stage of operation: CL
- How discovered: 9
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202110295198

## Discrepancy

AIRCRAFT WAS GROUND: MOLD SMELL COMING FROM PACKS DURING CLIMB AND DESCENT. FOUND APU OIL COOLING FAN LEAKING, REPLACED COOLING FAN AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 49-52-51. NO ODORS NOTED.

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