# SDR AALA202401237496

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 18, 2024
- Submitted: January 23, 2024
- Operation: Air carrier
- Aircraft: [N755AN](https://openairdocs.org/aircraft/N755AN), registered now
- Make and model: Boeing 777223
- Aircraft serial: 30263
- Aircraft time: 84,641 hours, 10,902 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: RFN4470
- Condition: Inoperative
- Location: Zone 200 - Fuse
- 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/AALA202401237496

## Discrepancy

AIRCRAFT WAS GROUNDED: A SOF EVENT DUE TO DIRTY SOCK SMELL ON DESCENT. **SUPPLEMENTAL FOR (AALA202401197973): REMOVE AND REPLACED OZONE CONVERTER (AALA202401197973) PER AMM 21-73-01; REMOVE AND REPLACED DUAL HEAT EXCHANGER (AALA202401230387) PER AMM 21-52-01; REMOVE AND REPLACED CONDENSER (AALA202401234057) PER AMM 21-52-03 AND REMOVE AND REPLACED (ACM) AIR CYCLE MACHINE (AALA202401237496) PER AMM 21-52-02. RIGHT HAND PACK OPERATIONAL CHECK GOOD. **(CLOSED).

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