# SDR ASAA2015060611978

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2015
- Submitted: June 8, 2015
- Operation: Air carrier
- Aircraft: [N516AS](https://openairdocs.org/aircraft/N516AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39044
- Aircraft time: 24,599 hours, 7,585 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989083
- Part serial: 7082
- Condition: Malfunctioned
- Location: A/C Bay
- Part time: 40,810 hours, 15,615 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/ASAA2015060611978

## Discrepancy

FWD CABIN ZONE TEMP LIGHT ILLUMINATED ON RECALL, EXT ON MAST CAUTION RESET.  ACFT GROUNDED. VERIFIED ZONE TRIM FAULT ON THE NR 2 ZONE TEMP CONTROLLER.  REPLACED THE FORWARD CABIN ZONE TRIM MODULATING VALVE IAW AMM'S 21-61-21-000-801 AND 21-61-21-400-801. VALVE OP CHECKED GOOD.

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