# SDR ASAA2016111818733

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 18, 2016
- Submitted: November 21, 2016
- Operation: Air carrier
- Aircraft: [N481AS](https://openairdocs.org/aircraft/N481AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44106
- Aircraft time: 5,191 hours, 1,707 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 24802
- Condition: Failed
- Location: Ac Bay
- Part time: 5,190 hours, 1,706 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2016111818733

## Discrepancy

IN FLIGHT, WHILE ACCOMPLISHING THE 'AFTER TAKEOFF' CHECKLIST, THE LEFT PACK LIGHT WAS ILLUMINATED. GROUNDED - YES. PER CREW LEFT PACK TEMP CLIMBED TO 53 DEGREES CELSIUS, THEN LEFT PACK TRIPPED OFF, TRIP RESET NO HELP. ACCOMPLISHED PACK TEMP CONTROL BITE ON BOTH CONTROLLERS, ZONE TEMP CONTROLLER 1 FAULTED "TEMP CONT VALVE", TEMP CONTROL VALVE NEEDS REPLACED L/T PACK, REF FIM 21-62 TASK 801. REPLACED LEFT TEMP CONTROL VALVE, OPS AND LEAK CHECK GOOD, REF AMM 21-51-10. BITE CHECK COMPLETED, NO DEFECTS NOTED, REF AMM 21-61-00.

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