# SDR ASAA12511539

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 10, 2012
- Submitted: May 14, 2012
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 19,841 hours, 5,974 cycles
- Engine: Cfmint CFM567B273
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 9171
- Condition: Failed
- Location: Cabin Temp
- Part time: 19,876 hours, 6,340 cycles
- Stage of operation: IN
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA12511539

## Discrepancy

ZONE TEMP CONTROL FAULTED THE FLT DECK TRIM VALVE.  ACFT GROUNDED. ACCOMPLISHED FIM 21-62-00-810-832.  R & R CONTROL CABIN ZONE TRIM AIR MODULATING VALVE REF MM 21-61-21-400-801 THRU STEP F. (4) . LEAK & OPS CHECKED GOOD 
MM 21-61-21-400-801 COMPLETED.

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