# SDR ASAA2017120422776

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 4, 2017
- Submitted: December 6, 2017
- Operation: Air carrier
- Aircraft: [N493AS](https://openairdocs.org/aircraft/N493AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41727
- Aircraft time: 6,470 hours, 2,189 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Module
- Part number: 693732478
- Part serial: D01935
- Condition: Failed
- Location: Cabin Temp
- Part time: 75,324 hours, 40,125 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017120422776

## Discrepancy

FLIGHT DECK VERY COLD EVEN WITH CONT CAB TEMP CONTROL AT FULL HOT. ONLY WAY TO GET HEAT IS ALL CONTROLLERS TO OFF. GROUNDED - YES. VERIFIED FAULT WITH CONT CAB IN FULL WARM, DUCT TEMP FOR CONT CAB GOES TO ALMOST 0 DEGREE FULL COLD AIR BLOWING FROM OUTLETS. INSPECTED AND FOUND CABIN SELECTOR RHEOSTAT FAULTY. RMVD AND INSTALLED NEW P5-17 PNL. REF B737-900 AMM 21-61-07. ACCOMPLISHED SYS OPS TEST REF AMM 21-61-07. NO FAULTS FOUND SYS CKS NORMAL.

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