# SDR F3LA202603240391

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 21, 2026
- Submitted: March 24, 2026
- Operation: Air carrier
- Aircraft: [N621FR](https://openairdocs.org/aircraft/N621FR), 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: 11437
- Aircraft time: 7,275 hours, 3,228 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Heat Exchanger
- Part number: 754D000001
- Part serial: 8121275475
- Condition: Odor
- Location: Nr 1
- Part time: 7,277 hours, 3,229 cycles
- 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/F3LA202603240391

## Discrepancy

AIRCRAFT GROUNDED.  ODOR EVENT DURING DESCENT.  DURING FLT TO DTW USED ELIMINATION OF ODOR CHECKLIST DURING DESCENT WITH FLT CREW USING O2 MASK.  AFTER DETECTING ODOR, AFTER PACK 1 WAS OFF FOR 5-10 MINS, DURING APPROACH & LANDING, ODOR DISSIPATED. DURING TAXI, PACK 1 ON & STRONG ODOR OF DIRTY SOCKS, IN COCKPIT & CABIN. PACK 1 OFF & ODOR DISSIPATED,  DURING POST FLT, 1ST OFF NOTICED STRONG ACRID ODOR, PLASTIC ODOR FROM INTERIOR OF FRONT OF ENG 1, NO ODOR FROM NR 2. BOTH ENGS, NORMAL INDS, ALL PHASES OF FLT & TAXI.  ACFT RFS.  PACK 1 REQUIRES DEFERRAL. PLACED ON MEL 21-52-01B, PLACARDS INSTALLED. ACFT OK FOR SERVICE. R & R PACK 1, TESTED, NO DISCREPANCIES NOTED IAW AMM 21-52-41-000-001-A & 21-52-41-400-001-A.

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