# SDR UIEA2020090251870

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 24, 2020
- Submitted: September 2, 2020
- Operation: Air carrier
- Aircraft: [N1487A](https://openairdocs.org/aircraft/N1487A), registered now
- Make and model: Boeing 767-31K
- Registry model: [Boeing 767-31K](https://openairdocs.org/model/boeing-767-31k) (OpenAirDocs)
- Aircraft serial: 28865
- Aircraft time: 88,121 hours, 18,162 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3987865
- Part serial: 9284
- Condition: Malfunctioned
- Location: Cabin Temp
- Stage of operation: TX
- 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/UIEA2020090251870

## Discrepancy

AFT CABIN ZONE TEMPERATURE VALVE INOPERABLE.  PERFORMED ZONE TEMPERATURE CONTROLLER BITE IAW AMM 21-61-03.  FOUND AFT ZONE TRIM VALVE FAULT.  TRANSFERRED TO MDDR 133363 PER MEL 21-61-04-02, CAT C, DUE 03 SEP 20 18:47Z DC, PLACARDS INSTALLED.  CB'S COLLARED.  LP 1274161 ITEM 5: REMOVED AND REPLACED TRIM AIR MODULATING VALVE AFT V3, OPERATIONS CHECK NORMAL IAW AMM 21-61-07, THIS CLEARS MDDR # 133363.

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