# SDR ASAA2022111740843

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 17, 2022
- Submitted: November 21, 2022
- Operation: Air carrier
- Aircraft: [N508AS](https://openairdocs.org/aircraft/N508AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35691
- Aircraft time: 51,697 hours, 15,194 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 10415
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 50,364 hours, 15,175 cycles
- Stage of operation: TX
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022111740843

## Discrepancy

AFTER START ZONE TEMP CONT CAB LIGHT ILLUMINATED. EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED THE CONTROL CABIN TAV V143 REF B737-800 AMM 21-61-21, PERFORMED REPAIR CONFIRMATION OPS CHECK SUCCESSFUL, ETOPS SUCCESSFUL GROUND VERIFICATION.

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