# SDR AALA202602200401

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 15, 2026
- Submitted: February 20, 2026
- Operation: Air carrier
- Aircraft: [N900UW](https://openairdocs.org/aircraft/N900UW), registered now
- Make and model: Airbus A321-231
- Registry model: [Airbus A321-231](https://openairdocs.org/model/airbus-a321-231) (OpenAirDocs)
- Aircraft serial: 7617
- Aircraft time: 27,172 hours, 10,883 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Heat Exchanger
- Part number: 753D000001
- Part serial: 8121166843
- Condition: Damaged
- Location: Zone 100
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202602200401

## Discrepancy

AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INBOUND INTO FLL DUE TO THE FLIGHT CREW REPORTING A VERY MUSTY ODOR DESCENDING THROUGH 15000 FEET AND IT GOT WORSE UNTIL LANDING.   MAINTENANCE FOUND THE APU LEAKING OIL AND REPLACED IT PER TASK CARD 26L31049003. MAINTENANCE ALSO FOUND THE LT PACK ACM SEZED ALONG WITH DAMAGE TO THE FAN PLENEUM CHAMBER DAMAGED / BROKEN. MAINTENANCE ALSO FOUND BROKEN FINS ON THE MAIN AND PRIMARY HEAT EXCHANGERS. MAINTENANCE REPLACED ACM (AALA202602209074), FAN PLENUM CHAMBER (AALA202602207956), MAIN HEAT EXCHANGER (AALA202602201204), PRIMARY HEAT EXCHANGER (AALA202602200401) AND THE REHEATER (AALA202602202627). A SATISFACTORY LEAK / OPERATIONAL CHECK WITH NO ISSUES OR ODORS NOTED.

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