# SDR ASAA2018061925135

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 19, 2018
- Submitted: June 20, 2018
- Operation: Air carrier
- Aircraft: [N491AS](https://openairdocs.org/aircraft/N491AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44109
- Aircraft time: 10,405 hours, 3,517 cycles
- System (JASC): [2163 · Cabin Temperature Sensor](https://openairdocs.org/jasc/2163)
- Part: Sensor
- Part number: 6240181
- Condition: Dirty
- Location: Cabin Temp
- Stage of operation: NR
- 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/ASAA2018061925135

## Discrepancy

FWD AND AFT TEMP CONTROLLERS APPEAR TO NEED SOME CALIBRATION WHEN OPERATED IN AUTO, WITH FWD AND AFT TEMP CONTROLLERS SET AT 9 AND 9:30 RESPECTIVELY THE CABIN TEMP IS ABOUT NORMAL (USUALLY THEY WOULD BE AT APPROXIMATELY THE 12 OCLOCK POSITION FOR THE SAME RESULT. GROUNDED - YES. CLEANED FWD AND AFT CABIN TEMP SENSOR PER AMM 21-61-06 OPS CHECK GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.