# SDR ASAA2020061642799

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 14, 2020
- Submitted: June 16, 2020
- Operation: Air carrier
- Aircraft: [N442AS](https://openairdocs.org/aircraft/N442AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43293
- Aircraft time: 25,435 hours, 8,168 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Controller
- Condition: Malfunctioned
- Location: Cockpit Temp
- Stage of operation: DE
- 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/ASAA2020061642799

## Discrepancy

ON RECALL, AT TOP OF DESCENT, CONT CAB ZONE TEMP ILLUMINATED,  RESET WITH PUSHING MASTER CAUTION.  GROUNDED - YES.  VERIFIED FAULT, ACCOMPLISHED A PACK/ ZONE TEMP CONTROL BITE, BOTH CONTROLLERS SHOW TRIM VALVE FOR FLT DECK FAULT.  ACCOMPLISHED A CONTROLLER RESET. REPLACED ALL 3 TEMP SENSORS FILTERS WITH NEW ONES.  ACCOMPLISHED A  PACK/ ZONE TEMP CONTROL. BITE AGAIN NO FAULTS. ACCOMPLISHED CABIN SELECTOR TEST, TEST PASSED,  NO FAULTS. IAW AMM 21-61-06-400-801, 21-61-00-700-806-002, & 21-61-07-400-803-003.

---
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.