# SDR ASAA2013010293593

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 2, 2013
- Submitted: January 4, 2013
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 10,448 hours, 3,253 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 11435
- Condition: Malfunctioned
- Location: Lt Acm
- Part time: 9,720 hours, 3,005 cycles
- Stage of operation: TX
- 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/ASAA2013010293593

## Discrepancy

LEFT PACK LIGHT ILLUMINATES ON RECALL AND EXTINGUISHES WITH MASTER CAUTION RESET.  LEFT PACK ZONE TEMP CONTROLLER BITE LOGGED TCV FAULT, REF FIM 21-62, TASK 801.  REPLACED LEFT TEMP CONTROL VALVE IAW AMM TASK 21-51-10-000-801 AND 21-51-10--400-801.  LT PACK/ ZONE TEMP CONTROLLER BITE PASSED.

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