# SDR ASAA2022122641225

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 26, 2022
- Submitted: December 27, 2022
- Operation: Air carrier
- Aircraft: [N477AS](https://openairdocs.org/aircraft/N477AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40716
- Aircraft time: 27,051 hours, 8,393 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Light
- Condition: False Indication
- Location: Air Conditioning
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022122641225

## Discrepancy

ON RECALL MASTER CAUTION AND "AIR CON " LIGHT ILL ZONE TEMP LIGHT ABOVE CONTROLLER CABIN ILLUMINATED LIGHTS EXTINGUISHED OM MASTER CAUTION RESET. GROUNDED - YES. PERFORMED PZTC BITE IAW AMM 21-61-00, ONE HIT FOR FLT DECK TRIM VALVE AT CONTROLLER NR 2 M1443.  PERFORMED PZTC BITE AND TEST PASSED. SUSPECTED INTERMITTEN FAULT.

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