# SDR YEN2026F00004

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2026
- Submitted: August 8, 2026
- Operation: Air carrier
- Aircraft: [N4058J](https://openairdocs.org/aircraft/N4058J), 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: 10619
- Aircraft time: 18,811 hours, 2,844 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Odor
- Location: Nr 1
- 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/YEN2026F00004

## Discrepancy

FLT  220, SAN-BOS. FROM TAKEOFF ANDDURING CLIMB WE NOTICED A DIRY SOCK / LOCKER ACRID SMELL . THE SMELL WAS ONLY EVIDENT IN FLIGHT DECK WE COMPLETED THE FUME CHECKLIST.  AFTER ISOLATING PACK 1 THE ODOR GREATLY SUBSIDED ( PACKS ); DEACTIVATED THE AIR CONDITION PACK (10HM) PER AMM TASK 21-51-00-040-002. COMPLIED WITH INFO NOTICE 2015-T015 STEPS 1 AND 2. IDENTIFIED ODOR TO PACK 1. LEVEL A WAS ACCOMPLISHED PER AMM 21-52-00. PACK 1 PLACED MEL 21-52-01A CAT C. MX-4 UPDATED PLACARD INSTALLED. (SUPPLEMENTAL INFORMATION TO FOLLOW)

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