# SDR ASAA2020031832456

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 16, 2020
- Submitted: March 18, 2020
- Operation: Air carrier
- Aircraft: [N492AS](https://openairdocs.org/aircraft/N492AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44110
- Aircraft time: 17,053 hours, 5,517 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020031832456

## Discrepancy

CONT CAB ZONE TEMP LIGHT ON RECALL, RESET WITH MASTER CAUTION RESET. GROUNDED - YES. REF B737-900 FIM 21-62 TASK 842 #2 PZTC PREV FLT LOGGED "FLIGHT DECK TRIM VALVE" FAULT, FAULT RESETTABLE. VERIFIED BOTH PACKS OPS CHECKED NORMAL IN ALL TEMP RANGE W/O FAULTS. 1&2 PZTC BITE TEST GOOD W/O FAULTS.

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