# SDR ASAA2023102945886

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 2023
- Submitted: October 30, 2023
- Operation: Air carrier
- Aircraft: [N413AS](https://openairdocs.org/aircraft/N413AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35205
- Aircraft time: 39,612 hours, 12,424 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: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023102945886

## Discrepancy

FWD AND CONT CAB TEMPERATURE CONTROL IS EXTREMELY ERRATIC AND VERY DIFFICULT TO CONTROL FOR ENTIRE FLIGHT. GROUNDED - YES. FOUND CONTROL CABIN SENSOR DIRTY & SENSOR FILTER & CABIN SENSOR, CLEANED FILTER & REMOVED SENSOR BUILD UP FOR DUST, BOTH RH & LR PZTC BITE NO FAULT, CONTROL TEMP & FWD CABIN TEMP NORMAL FIM 21-61 TASK 861.

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