# SDR DALA2026080804585

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 7, 2026
- Submitted: August 8, 2026
- Operation: Air carrier
- Aircraft: [N501DA](https://openairdocs.org/aircraft/N501DA), 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: 10437
- Aircraft time: 18,625 hours, 4,510 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Oil System
- Condition: Leaking
- Location: Apu
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2026080804585

## Discrepancy

A MODERATELY STRONG OIL / MUSTY ODOR. ODOR PERSISTED UNTIL DESELECTING PACK 1.  AT THAT POINT ODOR REDUCED BUT WAS STILL PRESENT. AFTER LANDING SELECTING APU BLEED RESULTED IN STRONGER ODOR.  NO ODOR IN CABIN.  REMOVED LT & RT ENG SPINNER COVERS FOUND EVIDENCE OF OIL BUT NOT FROM THE WEEP HOLES. CLEANED AREA & REINSTALLED COVER PER AMM 72-11. B. FOUND OIL AT APU IGV ACTUATOR DRAIN AND INSIDE INTAKE PLENUM. DEFERRED APU PER MEL 4910-01A, (LP 9183682, 9183685 - AIRCRAFT WAS GROUNDED)

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