Last updated: 22 February 2017
Narrative:The flight from Taipei to about 300 nmi northwest of San Francisco was uneventful and the airplane was flying at about 41,000 feet mean sea level when the No. 4 engine lost power. During the attempt to recover and restore normal power on the No. 4 engine, the airplane rolled to the right, nosed over, and entered an uncontrollable descent. The captain was unable to restore the airplane to stable flight until it had descended to 9,500 feet. After the captain stabilized the airplane, he elected to divert to San Francisco International Airport, where a safe landing was made. Although the airplane suffered major structural damage during the upset, descent, and subsequent recovery, only two persons among the 274 passengers and crew on board were injured seriously.
The maximum vertical acceleration forces recorded during the descent were 4.8Gs and 5.1Gs as the airplane descended through 30,552 feet and 19,083 feet, respectively.
Probable Cause:PROBABLE CAUSE: "The captainís preoccupation with an inflight malfunction and his failure to monitor properly the airplaneís flight instruments which resulted in his losing control of the airplane. Contributing to the accident was the captainís over-reliance on the autopilot after the loss of thrust on the no. 4 engine."
Forced landing on runway
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not
display the exact flight path.
Distance from Taipei-Chiang Kai Shek International Airport to Los Angeles International Airport, CA as the crow flies is 10856 km (6785 miles).