# SDR GTIA2025121839209

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 16, 2025
- Submitted: December 19, 2025
- Operation: Air carrier
- Aircraft: [N718NK](https://openairdocs.org/aircraft/N718NK), 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: 11872
- Aircraft time: 5,847 hours, 2,376 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Ecs
- Condition: Contaminated
- 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/GTIA2025121839209

## Discrepancy

STRONG SOCK ODOR DURING TAKEOFF.  PACK 1 REMOVED, ODOR DESCRIPTION OF ODOR/FUMES: PERSISTENT,  HYDRAULIC & MUSTY DRY ODOR.  APPARENT CABIN SOURCE: CABIN AIR SUPPLY VENTS. FLIGHT DECK & FWD CABIN. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQURIED. R & R CABIN RECIRCULATION FILTER CARTRIDGES IAW AMM 21-21-41.  PERFORMED LEVEL A DECONTAMINATION OF (ECS) IAW AMM 21-00-00-615-802-A. OPS CHKS GOOD.  NO ODORS FOUND.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.