# SDR DALA2025010200024

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 2, 2025
- Submitted: January 3, 2025
- Operation: Air carrier
- Aircraft: [N522DA](https://openairdocs.org/aircraft/N522DA), 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: 11154
- Aircraft time: 8,801 hours, 2,119 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Check Valve
- Condition: Failed
- Location: Lt A/C Pack
- Stage of operation: IN
- How discovered: 9
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2025010200024

## Discrepancy

AIRCRAFT 5022, STRONG FUMES "DIRTY SOCK" IN COCKPIT AND CABIN DESCENDING THROUGH 11,000: PILOTS DOWNED OXYGEN AND ACCOMPLISHED SMOKE & FUMES QRH. FUMES SOMEWHAT CLEARED PRIOR TO LANDING. TAXIED TO GATE. CORRECTIVE ACTION: REPLACED LEFT PACK CHECK VALVE, AND NBR 1 AND 2 ENGINES LB30 SEALS. (LP 6961867, 0738408)

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