# SDR ASAA2019040538890

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 3, 2019
- Submitted: April 5, 2019
- Operation: Air carrier
- Aircraft: [N590AS](https://openairdocs.org/aircraft/N590AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35687
- Aircraft time: 42,775 hours, 12,869 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989083
- Part serial: 369C
- Condition: Failed
- Location: Lt Acm
- Part time: 45,533 hours, 16,258 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/ASAA2019040538890

## Discrepancy

ON TAXI OUT, CONT CAB ZONE TEMP LIGHT DISPLAYED ON MASTER RECALL. RESET WITH MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED FLT DECK TRIM AIR MODULATING VALVE REF B737-800 AMM 21-61-21. 1 MIG-51A INSTL AND REMOVED OPS AND LEAK CK GOOD. PERFORMED CABIN TEMP CONT. AND INDICATION OPERATIONAL TEST REF AMM 21-61-00. OPS CKS GOOD.

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