# SDR YENA2025082600879

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 25, 2025
- Submitted: August 26, 2025
- Operation: Air carrier
- Aircraft: [N2142J](https://openairdocs.org/aircraft/N2142J), 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: 10254
- Aircraft time: 15,881 hours, 2,956 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Odor
- Location: Nr 2
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/YENA2025082600879

## Discrepancy

FLT 2104, BOS-BOS.  IMMEDIATALLY AFTER TAKE OFF,  THE FLIGHT SMELLED ABNORMAL FUMES.  CONTACTED DX MTC TO DISCUSS,  MTC ADVISES TO SWITCH PACKS ON - OFF TO ISOLATE.   DETERMINED IT WAS FROM PACK 2.   AIR RETURN DUE TO ETOPS RESTRICTION,   COMPLIED WITH INGO NOTICE 2017-T015L, PILOT DID NOT SUBMIT SMART SHEET. TREATED ODOR EVENT AS A CLASS 3 & PERFORMED LEVEL C DECON OF  ECS SYSTEM W ENGINE BLEED. APU WAS USED FOR SECOND DECON. PER AMM 21-00-00-615-804-A OP TO SUBTASK 21-00-00-860132-C.), CONTINUED TO RUN BOTH PACKS AFTER REINSTALLATION OF DUCTING BETWEEN CONDESOR AND CHECK VALVE FOR PACK 1 AND 2 WITH APCU BLEED & ENG 2 BLEED PER AMM 21-00-00-615-804-A—NO ODOR PRESENT THROUGHOUT CABIN AND COCKPIT AT THIS TIME.

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