# SDR ASAA2021110836555

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 8, 2021
- Submitted: November 10, 2021
- Operation: Air carrier
- Aircraft: [N486AS](https://openairdocs.org/aircraft/N486AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44107
- Aircraft time: 22,757 hours, 7,260 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 13496
- Condition: Failed
- Location: Left Ecs Bay
- Part time: 39,685 hours, 12,239 cycles
- Stage of operation: TX
- 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/ASAA2021110836555

## Discrepancy

AFTER START RECALL, LEFT PACK ILLUMINATED, RESETS WITH M.C. RESET. GROUNDED - YES. ACCOMPLISHED BITE CK & FOUND TCV FAILED REMOVED & REPLACED L/H PACK TCV REF B737-900 AMM 21-51-10 OPS & LK CK GOOD.  REACCOMP BITE CK NO FAULTS FOUND.

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