# SDR ASAA2023042543039

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 25, 2023
- Submitted: May 1, 2023
- Operation: Air carrier
- Aircraft: [N491AS](https://openairdocs.org/aircraft/N491AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44109
- Aircraft time: 27,857 hours, 8,711 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Acm
- Part number: 22064002
- Part serial: 11957
- Condition: Faulty
- Location: Right Ecs Bay
- Part time: 27,887 hours, 8,725 cycles
- Stage of operation: IN
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023042543039

## Discrepancy

DURING OPERATION OF R/H PACK. PACK TRIP OFF LIGHT ILLUMINATES AND WILL NOT RESET. GROUNDED - YES. ACCOMP PZTC BITE CK R/H PACK TCV FAULTED. REF B737-FIM 21-62 TASK 801. RMVD/RPLCD R/H PACK TCV LK CK GOOD BUT R/H PACK DISCHARGE TEMP CLIMBS TO 90 DEG C AND PACK TRIPS OFF REF B737-900 AMM 21-51-10. TCV FAULT CLEARED BUT NOTICED NO AIR BEING DRAWN DOWN RAM AIR INLET AND ACM MAKING BAD SOUND. CONFIRMED ACM IS SEIZED, UNABLE TO TURN IMPELLER. RMVD/RPLCD ACM REF AMM 21-51-04-400-802-002. NO FAULTS NOTED.

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