# SDR GTIA2025091139073

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 10, 2025
- Submitted: September 11, 2025
- Operation: Air carrier
- Aircraft: [N663NK](https://openairdocs.org/aircraft/N663NK), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 6994
- Aircraft time: 31,920 hours, 14,241 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Odor
- Location: Cabin
- 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/GTIA2025091139073

## Discrepancy

DIRTY SOCK SMELL ON TAKE OFF, PACK 1 OFF AND SMELL DISSIPATED. DESCRIPTION OF ODOR/FUMES: PERSISTENT, MUSTY DRY SMELL. APPARENT CABIN SOURCE: UNKNOWN. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED. -REF TSM 05-50-00-810-831A . APU VERIFIED NO LEAKS. PRE-CONDITIONED A/C WITH APU, NO SMELL NOTED. ISOALTED PACK 1 AND 2, NO SMELL NOTED. RAN BOTH ENGINES AND ISOLATED BLEED PACK 1 AND PACK 2, NO SMELL NOTED. ALL STEPS ACCOMPLISHED WITH AEROTRACER ON BOARD. REF AMM 21-61-00-49-00-00. SMELL COULD NOT BE DUPLICATED. A/C OK FOR SVC.

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