# SDR ASAA2020103033447

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 30, 2020
- Submitted: November 3, 2020
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 47,453 hours, 14,362 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 9881
- Condition: Inoperative
- Location: Left Ecs Bay
- Part time: 47,457 hours, 14,364 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/ASAA2020103033447

## Discrepancy

ZONE TEMP ANNUNCIATOR LIGHTS UP (ABOVE CONT CAB) ON MASTER RECALL, BUT TURNS OFF WHEN MASTER CAUTION IS RESET.  GROUNDED-YES.  REPLACED CONTROL CABIN TCV, PER B737-800 AMM 21-61-21-000-801, GREEN GO LIGHT ILLUMINATED.

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