# SDR DALA2026040602166

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 5, 2026
- Submitted: April 6, 2026
- Operation: Air carrier
- Aircraft: [N373NW](https://openairdocs.org/aircraft/N373NW), registered now
- Make and model: Airbus A320-212
- Registry model: [Airbus A320-212](https://openairdocs.org/model/airbus-industrie-a320-212) (OpenAirDocs)
- Aircraft serial: 1641
- Aircraft time: 69,765 hours, 33,494 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Condition: Odor
- Stage of operation: DE
- 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/DALA2026040602166

## Discrepancy

AT 15000 FEET ON DESCENT DIRTY SOCK SMELL ALL WAY UNTIL SHUTDOWN. FLIGHT ATTENDANT SMELLED IT. FO PUT MASK ON AS PRECAUTION. EMERGENCY DECLARED. C/A: INSPECTED. OIL PRESENT IN APU COMPARTMENT. APU DEFERRED ON LOG 8423667. C/W MSI PREVENTION 2172. A- CREW NOT AVAIL. B- C/W. C- FORM NOT COMPLETED. D- N/A. E/F - APU BELIEVED TO BE CULPRIT. NO PTRACK SPIKES DURING ENGINE RUNS. G/H - N/A. I - C/W. J/K/L - C /W. FILTERS REPLACED. REF A320 AMM 21-21-. LEVEL B CONTAMINATION REMOVAL C/W. REF AMM 21-00.  AIRCRAFT WAS GROUNDED

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