# SDR UIEA2020041300747

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 12, 2020
- Submitted: April 13, 2020
- Operation: Air carrier
- Aircraft: [N1489A](https://openairdocs.org/aircraft/N1489A), registered now
- Make and model: Boeing 767-31K
- Registry model: [Boeing 767-31K](https://openairdocs.org/model/boeing-767-31k) (OpenAirDocs)
- Aircraft serial: 27206
- Aircraft time: 106,993 hours, 21,091 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3987865
- Part serial: 7512
- Condition: Malfunctioned
- Location: Cabin Temp
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2020041300747

## Discrepancy

AFT TRIM VALVE INOP(<P>TRANSFERRED TO DMI #126981 IAW MEL 21-61-04-02 , CAT 'C'.<BR DATA-MCE-BOGUS="1" /></P><P>LP <SPAN>822015: </SPAN><SPAN>BIT ZONE TEMP CONTROLLER AND RECEIVED AFT ZONE TRIM VALVE FAULT. CHECKED CONTINUITY FROM D7702 C13 AND C15 TO DXO PIN 1&2. CONTINUITY CHECK GOOD. PER FIM 21-61 FT 912 , REMOVED AND REPLACED TRIM AIR MODULATING VALVE IAW AMM 21-61-07. OPS CHECK GOOD. DMI 126981 CLOSED.</SPAN></P>)

---
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.