# SDR ASAA2017032720304

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 27, 2017
- Submitted: April 3, 2017
- Operation: Air carrier
- Aircraft: [N471AS](https://openairdocs.org/aircraft/N471AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41703
- Aircraft time: 9,837 hours, 3,271 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989083
- Part serial: 5296
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 55,466 hours, 21,120 cycles
- Stage of operation: NR
- 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/ASAA2017032720304

## Discrepancy

CONTROL CABIN ZONE TEMP ILLUMINATDED ON RECALL.  ACFT GROUNDED.   REMOVED & REPLACED THE CONTROL CABIN TRIM AIR VALVE, IAW AMM 21-61-21 & 401. LEAK & OPS CHECKED GOOD.

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