# SDR AALA202602037475

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 30, 2026
- Submitted: February 3, 2026
- Operation: Air carrier
- Aircraft: [N781AN](https://openairdocs.org/aircraft/N781AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 29586
- Aircraft time: 98,516 hours, 12,315 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Heat Exchanger
- Part number: 8102102
- Part serial: 200102075
- Condition: Contaminated
- Location: Zone 100
- Part time: 11,857 hours, 1,532 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/AALA202602037475

## Discrepancy

AIRCRAFT WAS GROUNDED: CREW NOTICED STRONG WET SUCK ODOR BEGAN AT 9000K ON DESCENT FROM REAR TO FRONT. *REMOVED AND REPLACED LEFT HAND (AALA202601307475) AND RIGHT HAND (AALA202602038634) HEAT EXCHANGERS, PER JOB CARD 72L00021001. REMOVED AND REPLACED RIGHT HAND ACM-AIR CYCLE MACHINE (AALA202602036015), PER AMM 21-52-02.

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