# SDR ASAA2015072912630

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 29, 2015
- Submitted: August 4, 2015
- Operation: Air carrier
- Aircraft: [N516AS](https://openairdocs.org/aircraft/N516AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39044
- Aircraft time: 25,184 hours, 7,785 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 11208
- Condition: Malfunctioned
- Location: A/C Bay
- Part time: 25,721 hours, 8,151 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/ASAA2015072912630

## Discrepancy

FWD CABIN ZONE TEMP LIGHT ILLUMINATED WITH RECALL, EXTINGUISHES WITH MASTER CAUTION RESET.   ACFT GROUNDED.  REPLACED THE FWD CABIN ZONE TRIM AIR MODULATING VALVE IAW AMM 21-61-21-00-801 AND AMM 21-61-21-400-801.  BITE CHECK OF THE PACK/ZONE TEMPERATURE CONTROLLERS PASSES WITHOUT FAULTS.  THE NEW VALVE LEAK CHECKED GOOD.

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