Incident Overview
On March 25, 2012, at 1044 Taipei local time, a Boeing 747-400 aircraft, registered as B-16411 and operated by EVA Airways Corporation as passenger flight BR702, experienced a malfunction of the left outflow valve and an abnormal cabin altitude during enroute climb. The flight crew initiated a return to Taoyuan International Airport, where the aircraft landed without further incident.
Investigation
The Aviation Safety Council (ASC) of Taiwan conducted an investigation into the incident. The final report, numbered ASC-AOR-13-03-001, was published in Chinese and is available for download on the ASC website at www.asc.gov.tw. The report details the findings of the investigation, but no probable cause was stated in the source material.
Aircraft and Flight Information
The involved aircraft was a Boeing 747-400, registration B-16411. The flight was a scheduled passenger service operated by EVA Airways. The incident occurred during the climb phase of the flight, and no further details were provided regarding occupants, injuries, or damage.