# SDR IPXA2026033140569

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2026
- Submitted: March 31, 2026
- Operation: Air carrier
- Aircraft: [N426UP](https://openairdocs.org/aircraft/N426UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 25457
- Aircraft time: 33,011 hours, 22,219 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Ecs
- Condition: Odor
- Stage of operation: CL
- 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/IPXA2026033140569

## Discrepancy

STRONG WET SOCK ODOR EMANATED FROM ECS SYSTEM AT V1 SPEED TAKEOFF. ODOR INCREASED EVEN GREATER AT 10K ACCELERATION. (SEE ATTACHMENT FOR THE REST OF THE WRITE UP) ACCOMPLISHED FIM 21-00-00/301. INSPECTED APU, LEFT AND RIGHT PACK BLEED DUCTS FOR POSSIBLE OIL CONTAMINATION, NO LEAKS OR WETTING NOTED. ALL APU, LEFT AND RIGHT PACKS DUCTS ARE DRY. INSPECTED BOTH LEFT AND RIGHT PRIMARY AND SECONDARY HEAT EXCHANGERS, NO DEFECTS NOTED. ACCOMPLISHED ENG RUN AT DIFFERENT POWER SETTINGS REF AMM 71-00-00/201 WITH INDIVIDUAL L AND R PACKS OPERATION REF AMM 21-00-01/201. NO FOUL SMELL OR ODOR NOTED AT THIS TIME.

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