# SDR ASAA0852825

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 21, 2008
- Submitted: April 23, 2008
- Operation: Air carrier
- Aircraft: [N577AS](https://openairdocs.org/aircraft/N577AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35186
- Aircraft time: 4,403 hours, 1,315 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 9406
- Condition: Malfunctioned
- Location: Cabin Temp
- Part time: 4,403 hours, 1,315 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0852825

## Discrepancy

CABIN TEMPERATURE ZONE CONTROL ANNUNCIATED.  REPLACED TEMPERATURE TRIM MODULATING VALVE.

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