# SDR ASAA2021121536929

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 15, 2021
- Submitted: December 21, 2021
- Operation: Air carrier
- Aircraft: [N462AS](https://openairdocs.org/aircraft/N462AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36362
- Aircraft time: 28,160 hours, 9,041 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: TX
- 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/ASAA2021121536929

## Discrepancy

ON TAXI OUT CONT CABIN ZONE TEMP LIGHT ILLUMINATED. EXTINGUISHED WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED PACK ZONE TEMPERATURE CONTROLLER BITE TEST PER B737-900 AMM 21-61-00-700-806-002. RH PZTC FAULTED IN PREVIOUS FLIGHT 4 LEGS AGO CONT CABIN TRIM VALVE CURRENT 3 LEGS ON FAULT AND FAULT RESET, OPERATED A/C PRESS FOR 5 MINUTES PER AMM 21-60-00-700-807-002 AFTER REACCOMPLISHED PZTC BITE AND NO FAULTS NOTED.

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