# SDR ASAA2021110536526

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 5, 2021
- Submitted: November 9, 2021
- Operation: Air carrier
- Aircraft: [N419AS](https://openairdocs.org/aircraft/N419AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41734
- Aircraft time: 32,025 hours, 10,299 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021110536526

## Discrepancy

ON MASTER CAUTION RECALL, CONT CAB ZONE TEMP LIGHT ILLUMINATES. EXTINGUISHES ON MASTER CAUTION RESET. GROUNDED - YES. REF B737-900 FIM 21-62 TASK 848, #2 PZTC FREV FLT LOGGED FLT DECK TRIM VLV FAULT, FAULT RESETTABLE. BOTH PZTC'S BITE VERIFY TESTED GOOD W/O CURRENT FAULTS. VERIFIED BOTH PACKS OPS CHECKED NORMAL ON GND W/O FAULT LIGHTS.

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