# SDR ASAA2018012823320

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 28, 2018
- Submitted: January 30, 2018
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 41,721 hours, 12,365 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Filter
- Condition: Dirty
- 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/ASAA2018012823320

## Discrepancy

CONTROL CABIN ZONE TEMP ILLUMINATED WITH MASTER CAUTION RECALL AND DOES RESET.  ACFT GROUNDED.  PERFORMED A PACK TEMPERATURE CONTROL BITE PROCEDURE IAW FIM 21-62, TASK 801.  RIGHT PACK/ZONE TEMPERATURE CONTROLLER LOGGED A FLT DECK TRIM VALVE FAULT FOR BITE AND PREFLT. VERIFY PASSED WITH NO FAULTS.  CLEANED FLT DECK TEMP SENSOR AND REPLACED FILTER IAW AMM 21-61-10, AND AMM21-61-06. OPERATED PACKS FOR SEVERAL MINUTES AND PERFORMED BITE PROCEDURE AGAIN WITH NO FAULTS NOTED. SIGNIFICANT SYSTEM GROUND VERIFICATON SUCCESSFUL.

---
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.