# SDR ASAA2022020137318

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2022
- Submitted: February 3, 2022
- Operation: Air carrier
- Aircraft: [N581AS](https://openairdocs.org/aircraft/N581AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35188
- Aircraft time: 51,945 hours, 15,422 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 9171
- Condition: Inoperative
- Location: Left Ecs Bay
- Part time: 48,184 hours, 14,433 cycles
- Stage of operation: TO
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022020137318

## Discrepancy

LEFT PACK LIGHT ILLUMINATED AFTER TAKEOFF LIGHT EXTINGUISHES WHEN MASTER CAUTION SYSTEM IS RESET. GROUNDED - YES. REMOVED AND REPLACED L/H PACK TEMP CONTROL VALVE ASSY. REF B737-800 AMM 21-51-10. GRD VERIFICATION TESTS SATISFACTORY.

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