# SDR SCNA20251021398

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 16, 2025
- Submitted: October 21, 2025
- Operation: Air carrier
- Aircraft: [N831SY](https://openairdocs.org/aircraft/N831SY), registered now
- Make and model: Boeing 737-83N
- Registry model: [Boeing 737-83N](https://openairdocs.org/model/boeing-737-83n) (OpenAirDocs)
- Aircraft serial: 28249
- Aircraft time: 69,292 hours, 31,074 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/SCNA20251021398

## Discrepancy

A/C PACKS EMIT SMELLY SOCK SMELL ON DESCENT ON BOTH LEGS THRU APPROX 15000".  PERFORMED GROUND PACK RUN TEST. COULD NOT DUPLICATE ON GROUND. BOTH PACKS OPERATE NORMALLY. I REF AMM 21-51-00

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