# SDR AALA202111100391

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 27, 2021
- Submitted: November 10, 2021
- Operation: Air carrier
- Aircraft: [N191UW](https://openairdocs.org/aircraft/N191UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 1447
- Aircraft time: 66,975 hours, 25,420 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Oil Cooler
- Part number: 1604941
- Part serial: 2448
- Condition: Leaking
- Location: Apu
- Part time: 29,969 hours, 15,259 cycles
- Component: Apu, Hnywl, 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/AALA202111100391

## Discrepancy

AIRCRAFT WAS GROUNDED: DURING DESCENT AT IDLE POWER STRONG OILY SMELL AT COCKPIT AND AFT CABIN BELOW 10,000" ISOLATED SOURCE OF ODOR TO THE APU DUE TO FINDING OIL IN THE APU INLET OPENING.  REPLACED APU OIL COOLER AND APU OIL COOLING FAN (AALA202111101776) PER AMM 49-91-44. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.

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