# SDR ASAA2018071425469

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 14, 2018
- Submitted: July 20, 2018
- Operation: Air carrier
- Aircraft: [N431AS](https://openairdocs.org/aircraft/N431AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43255
- Aircraft time: 18,868 hours, 6,230 cycles
- System (JASC): [2161 · Cabin Temperature Controller](https://openairdocs.org/jasc/2161)
- Part: Controller
- Part number: 510901601
- Part serial: 5109016002024
- Condition: Failed
- Location: E&E Bay
- Part time: 7,925 hours, 2,587 cycles
- 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/ASAA2018071425469

## Discrepancy

ZONE TEMP LIGHT ILLUMINATED ON FWD CABIN TEMP CONTROL. EXTINGUISHED ON MASTER RESET. CANNOT CONTROL SUPPLY DUCT TEMP WITH TEMP SELECTOR KNOB. GROUNDED - YES. NR 2 P/Z CONTROLLER LOGGED FWD ZONE CABIN SENSOR FAULT. REF AMM 21-61-10 CLEANED SENSOR, NO HELP. UNABLE TO RESET FAULT. REPLACED NR 2 TEMP CONTROLLER PER AMM 21-61-20. PACK TEMP CONTROLLER BITE TEST PASSED NO FAULTS NOTED PER AMM 21-61-00. CABIN TEMP OPERATIONAL TEST SUCCESSFUL PER AMM 21-61-00.

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