# SDR DALA2025072805619

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 27, 2025
- Submitted: July 28, 2025
- Operation: Air carrier
- Aircraft: [N505DZ](https://openairdocs.org/aircraft/N505DZ), registered now
- Make and model: Airbus A321-271NX
- Registry model: [Airbus A321-271NX](https://openairdocs.org/model/airbus-s-a-s-a321-271nx) (OpenAirDocs)
- Aircraft serial: 10935
- Aircraft time: 12,340 hours, 2,991 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: O-Ring
- Condition: Leaking
- Location: Apu Oil Cooler
- Stage of operation: IN
- How discovered: O
- Nature of condition: K, B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2025072805619

## Discrepancy

AIRCRAFT 5005, ODOR IN CABIN & COCKPIT MORE PREVALENT AFTER APU BLEED FLIGHT ATTENDANT DESCRIBED AS " METALLIC". CORRECTIVE ACTION: FOUND LEAK COMING FROM INPUT LINE OFF OF OIL COOLER. REPLACED O-RING SEALS PER A321 AMM 49-91. PERFORMED LEVEL B REMOVAL OF ECS IN REF TO A321 AMM 21-00. REPLACED RECIRCULATING FILTERS PER A321 AMM 21-21. (LP 6995576)

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