# SDR ASAA2016100118153

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 1, 2016
- Submitted: October 3, 2016
- Operation: Air carrier
- Aircraft: [N477AS](https://openairdocs.org/aircraft/N477AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40716
- Aircraft time: 5,384 hours, 1,724 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989084
- Part serial: 24422
- Condition: Faulted
- Location: Cabin Temp
- Part time: 5,384 hours, 1,724 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/ASAA2016100118153

## Discrepancy

DURING MASTER CAUTION RECALL, AFT CABIN ZONE TEMP LIGHT ILLUMINATED.  ACFT GROUNDED. LT PACK ZONE TEMP CONTROLLER BITE TEST IAW AMM TASK 21-61-00-700-806-002 SHOWS "AFT CABIN TRIM VALVE ZONE TCV (V145) FAIL. REMOVED AND REPLACED AFT CABIN ZONE TRIM VALVE IAW AMM TASK 21-61-21, LEAK & OPS CHECKED NORMAL. ACCOMPLISHED GROUND VERIFICATION TEST IAW AMM TASK 21-61-00.

---
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.