# SDR ASAA2017101222193

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 12, 2017
- Submitted: October 16, 2017
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 28,587 hours, 8,501 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 10398
- Condition: Faulted
- Location: Lt A/C Pack
- Part time: 36,324 hours, 11,058 cycles
- Stage of operation: CR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017101222193

## Discrepancy

LEFT PACK LIGHT ILLUMINATED IN FLIGHT AND EXTINGUISHED.  ACFT GROUNDED.  PERFORMED A PACK ZONE TEMERATURE CONTROL BITE TEST IAW AMM 21-61-00-700-806-002,  FAULTED LEFT PACK TCV. REMOVED LEFT PACK TCV IAW AMM 21-51-10-000-801, AND INSTALLED IAW AMM 21-51-10-400-801.  GROUND VERIFICATION TEST PERFORMED IAW AMM 21-51-10-860-006, AND AMM 21-61-00-700-806-002.  ALL TESTS PASSED.

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