# SDR ASAA2012090592830

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 5, 2012
- Submitted: September 7, 2012
- Operation: Air carrier
- Aircraft: [N534AS](https://openairdocs.org/aircraft/N534AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35202
- Aircraft time: 6,624 hours, 2,046 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 2248
- Condition: Failed
- Location: A/C Bay
- Part time: 57,145 hours, 32,363 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/ASAA2012090592830

## Discrepancy

RIGHT PACK LIGHT ILLUMINATED AFTER ENGINE START ON RECALL.  BITE CHECK OF NR 2 PACK ZONE TEMP CONTROLLER REVEALED TCV FAULT-THIS PACK.  VERIFIED THAT TCV, V141, IS INOP AND REPLACED TEMP CONTROL VALVE, REF MM 21-51-10. TCV INSTALLATION TEST NORMAL IAW MM 21-51-10.

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