# SDR ASAA2015050111587

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 1, 2015
- Submitted: May 4, 2015
- Operation: Air carrier
- Aircraft: [N462AS](https://openairdocs.org/aircraft/N462AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36362
- Aircraft time: 3,904 hours, 1,287 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989084
- Part serial: 21524
- Condition: Malfunctioned
- Location: A/C Bay
- Part time: 3,904 hours, 1,287 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/ASAA2015050111587

## Discrepancy

AFTER ENGINE START, UPON MASTER RECALL, FWD CABIN ZONE TEMP LIGHT COMES ON.  FLIGHT CREW ENROUTE MEL.  ACFT GROUNDED.  ZONE TEMP CONTROLLER NR 2 FAULTED: FWD CABIN TRIM MODULATION VALVE.  REF, AMM 21-61-00.  REPLACED FWD CABIN TRIM MOD VALVE WITH NEW. REF: AMM 21-61-21.  ZONE TEMP CONTROLLER BIT TEST GOOD.

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