# SDR ASAA2016093018156

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 30, 2016
- Submitted: October 3, 2016
- Operation: Air carrier
- Aircraft: [N477AS](https://openairdocs.org/aircraft/N477AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40716
- Aircraft time: 5,373 hours, 1,722 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Light
- Condition: Illuminated
- Location: Cabin Temp
- 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/ASAA2016093018156

## Discrepancy

AFT CABIN ZONE TEMP LIGHT ILLUMINATED DURING MASTER RECALL & EXTINGUISHED WITH MASTER RECALL RESET. GROUNDED - YES. PERFORMED PACK/ZONE TEMPERATURE CONTROLLER BITE TEST IAW AMM 21-61-00, NR 1 TEMP CONTROLLER SHOWS PREVIOUS FLIGHT "ZONE TRIM VALVE" FAULT. RAN "VERIFY" TEST ON NR 1 CONTROLLER NUMEROUS TIMES, NO FAULTS NOTED. GROUND FUNCTIONAL TESTS NORMAL. OK FOR CONTINUED SERVICE.

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