# SDR ASAA2020110733531

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 7, 2020
- Submitted: November 13, 2020
- Operation: Air carrier
- Aircraft: [N534AS](https://openairdocs.org/aircraft/N534AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35202
- Aircraft time: 37,369 hours, 10,777 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3966081
- Part serial: 4925
- Condition: Failed
- Location: Lt Flow
- Part time: 35,009 hours, 10,116 cycles
- Stage of operation: CR
- 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/ASAA2020110733531

## Discrepancy

AT CRUISE LEFT "PACK" LIGHT ILLUMINATES ON RECALL AND EXTINGUISHES ON MASTER CAUTION RESET.  QRH COMPLIED WITH, NO NOTICEABLE CHANGE IN CABIN PRESSURE, ENGINE AND WING ANTI-ICE WERE OFF.  GROUNDED-YES.  REMOVED AND REPLACED LT FLOW CONTROL VALVE, REF B737-800 AMM 21-51-01.  OPERATIONS CHECK NORMAL, REF AMM 21-61-00 PACK/ZONE TEMP CONTROL BITE TEST PASSED.  GROUND VERIFICATION NORMAL.

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