# SDR GTIA2025072839020

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 26, 2025
- Submitted: July 28, 2025
- Operation: Air carrier
- Aircraft: [N729NK](https://openairdocs.org/aircraft/N729NK), 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: 11908
- Aircraft time: 3,241 hours, 1,358 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Odor
- Location: Zone 100
- 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/GTIA2025072839020

## Discrepancy

BAD ODOR COMING FROM PACKS THROUGHOUT FLIGHT, BECAME WORSE DURING DESCENT (MUSTY DIRTY SOCKS ) SWITCHED OFF PACK 1 AND SMELL WENT AWAY. DESCRIPTION OF ODOR/FUMES: PERSISTENT, DIRTY SOCKS SMELL. APPARENT CABIN SOURCE: CABIN AIR SUPPLY VENTS. FWD CABIN AND FLIGHT DECK. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-C/W TSM 05-50-00-810-831-A FOUND ENG 1 PACK 1 TO BE CAUSE. PERFORMED DECONTAMINATION LEVEL A OF PACK 1 ENG 1 IAW AMM 21-00-00-615-802-A. NO ODORS OR FUME NOTED DURING DECONTAMINATION. A/C OK FOR SVC AT THIS TIME INSPECTION ENG 1 & 2 OIL LEVEL IAW AMM 12-13-79. OIL LEVEL GOOD.

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