# SDR DALA2021061403223

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 11, 2021
- Submitted: June 14, 2021
- Operation: Air carrier
- Aircraft: [N352DN](https://openairdocs.org/aircraft/N352DN), registered now
- Make and model: Airbus A321-211
- Registry model: [Airbus A321-211](https://openairdocs.org/model/airbus-a321-211) (OpenAirDocs)
- Aircraft serial: 8283
- Aircraft time: 8,086 hours, 3,585 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: O-Ring
- Condition: Leaking
- Location: Apu Oil System
- Stage of operation: NR
- 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/DALA2021061403223

## Discrepancy

NOTICED A OILY SOCK SMELL AFTER TURNING ON APU AND BLEED AIR. REFERENCE ORIG LOG 1835280 FOR REPAIR. REMOVED APU FUEL CONTROL. REMOVED AND REPLACED APU OIL COOLING FAN ASSY O RING ON FAN MOUNTING FLANGE AND 2 NEW O RINGS ON TRANSFER TUBE. REMOVED AND REPLACED APU FUEL CONTROL UNIT.

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