# SDR ASAA2019102183042

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 18, 2019
- Submitted: October 22, 2019
- Operation: Air carrier
- Aircraft: [N516AS](https://openairdocs.org/aircraft/N516AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39044
- Aircraft time: 41,202 hours, 12,378 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989083
- Part serial: 2905
- Condition: Inoperative
- Location: Lt Zone Temp
- Part time: 60,599 hours, 35,908 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/ASAA2019102183042

## Discrepancy

DURING RECALL CONT CABIN ZONE TEMP LIGHT ILLUMINATED. LIGHT EXTINGUISHES W/ MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED CONTROL CABIN TRIM AIR MODULATING VALVE REF B737-800 AMM 2161-21-000-801 & 21-61-21-400-801. LEAK & OPS CHECK GOOD. THIS CLEARS MEL 21-21G.

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