# SDR ASAA2013051994859

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 19, 2013
- Submitted: May 23, 2013
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 12,011 hours, 3,673 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 1480
- Condition: Malfunctioned
- Location: Lt A/C Pack
- Part time: 65,994 hours, 37,579 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/ASAA2013051994859

## Discrepancy

LT PACK LIGHT ILLUMINATED ON MASTER CAUTION RECALL.  LIGHT EXTINGUISHES WHEN RESET.  ACFT GROUNDED.  NR 1 ZONE TEMP CONTROLLER SHOWS SEVERAL LT TCV FAULTS.  REPLACED LT TCV (V139) REF AMM 21-61-21, BITE TEST OPS CK NORMAL REF AMM TASK 21-61-00, AND GROUND VERIFICATION TEST SUCCESSFUL.

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