# SDR ASAA2023033142662

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 31, 2023
- Submitted: April 3, 2023
- Operation: Air carrier
- Aircraft: [N469AS](https://openairdocs.org/aircraft/N469AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41702
- Aircraft time: 32,490 hours, 10,329 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989083
- Part serial: 12096
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 46,517 hours, 16,196 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/ASAA2023033142662

## Discrepancy

CONT CAB ZONE TEMP ILLUMINATED AFTER ENGINE START. MASTER CAUTION RECALL AND EXTINGUISHES UPON MASTER CAUTION RESET. GROUNDED - YES. REMOVED AND REPLACED FLIGHT DECK ZONE TRIM VALVE WITH SERVICEABLE UNIT IN REF TO B737-900 AMM 21-61-21.

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