# SDR ASAA2014050307681

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 3, 2014
- Submitted: May 6, 2014
- Operation: Air carrier
- Aircraft: [N408AS](https://openairdocs.org/aircraft/N408AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41732
- Aircraft time: 5,521 hours, 1,754 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989084
- Part serial: 19028
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 3,604 hours, 1,139 cycles
- Stage of operation: NR
- 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/ASAA2014050307681

## Discrepancy

LEFT "PACK" LIGHT ILLUMINATES DURING MASTER CAUTION RECALL.  THE LIGHT EXTINGUISHES WHEN MASTER CAUTION SYSTEM IS RESET.  ACFT GROUNDED.  LEFT PACK PRIMARY TEMP CONTROL INOPERATIVE.  R & R LEFT TEMP CONTROL VALVE REF TASK 21-51-10-000-801 AND 21-51-10-400-801.  OPS TEST PASSED AND LEAK CHECK CHECKED GOOD, SAME REF.

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