# SDR UIEA2016042000253

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 18, 2016
- Submitted: April 22, 2016
- Operation: Air carrier
- Aircraft: [N640GT](https://openairdocs.org/aircraft/N640GT), registered now
- Make and model: Boeing 767-3S1
- Registry model: [Boeing 767-3S1](https://openairdocs.org/model/boeing-767-3s1) (OpenAirDocs)
- Aircraft serial: 25221
- Aircraft time: 80,065 hours, 16,924 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Cabin Pressure
- Condition: Failed
- Stage of operation: DE
- How discovered: O
- Nature of condition: P
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2016042000253

## Discrepancy

PRESSURIZATION APPEARS TO HAVE FAILED ON DESCENT THROUGH 3,000 FT.  OUTFLOW VLV OPENED FULLY & REMAINED FULL OPEN NO EICAS OR STATUS MSGS & NO FAULTS FOUND.  PERFORMED BITE TEST CPC 1 & 2 IAW AMM 21-31-00, NO DEFECTS NOTED.  ALSO PERFORMED MANUAL MODE CONTROL TEST IAW AMM 21-31-00 WITH ALL OPERATIONS NORMAL.  ALSO VISUALLY INSPECTED OUTFLOW VLV FROM GND OK.  REQUESTED PRESS SYS VERIFICATION FLIGHT.  FLIGHT CREW INFORMED VERIFICATION FLIGHT SUCCESSFUL, ALL NORMAL.

---
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.