# SDR ASAA20181227550

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 24, 2018
- Submitted: December 27, 2018
- Operation: Air carrier
- Aircraft: [N564AS](https://openairdocs.org/aircraft/N564AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35103
- Aircraft time: 46,484 hours, 14,027 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 10179
- Condition: Faulted
- Location: Right Ecs Bay
- Part time: 41,807 hours, 12,628 cycles
- Stage of operation: NR
- 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/ASAA20181227550

## Discrepancy

RT PACK LIGHT COMES ON W/ RECALL EXTINGUISHES WITH RESET. GROUNDED - YES. PERFORMED BITE CHECK OF #2 PACK/ZONE TEMP CTRL SHOWS "TCV-THIS PACK" LAST FLIGHT, REF B737-800 FIM 21-62 TASK 801. FAULT CLEARS. RE-PERFORMED RH PACK TEMP CONTROL BITE PROCEDURE, CONFIRMED NO FAULTS ACTIVE ON RH TEMP CONTROLLER. DUE TO HISTORY AND PREVIOUS TROUBLESHOOTING REMOVED AND REPLACED TEMP CONTROL VALVE REF B737-800 AMM 21-51-10. LEAK CHECK GOOD. PERFORMED BITE PROCEDURE; NO FAULTS NOTED. GROUND VERIFICATION SUCCESSFUL.

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