# SDR ASAA2014031607210

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2014
- Submitted: March 18, 2014
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 29,862 hours, 8,792 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 11664
- Condition: Failed
- Location: A/C Bay
- Part time: 16,245 hours, 4,801 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/ASAA2014031607210

## Discrepancy

CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED DURING RECALL AND EXTINGUISHED ON RESET.  ACFT GROUNDED.  ACCOMPLISHED PACK/ ZONE TEMP CONTROLLER BITE TEST.  FLIGHT DECK TRIM VALVE LIGHT ILLUMINATED ON RT PACK / ZONE TEMP CONTROLLER.  REPLACED CONTROL COMPT TRIM AIR MODULATING VALVE.  OPS NORMAL, NO LEAKS NOTED.

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