Unfallbericht:The aircraft was descending from FL410 with the throttles at idle. As power was added at FL295 the left engine surged and exceeded maximum EGT. Eighteen seconds later the right engine surged and exceeded its maximum EGT. The left and right engines were shut down at FL200 and FL177 respectively. The engines were successfully restarted about FL150. The inability of the engines to accelerate after the manually induced surge was due to contaminated fuel nozzles which significantly reduced combustion chamber efficiencies & which resulted in a subidle stall. On March 31, 1986 this same aircraft (N609UA) again suffered a double engine flameout.
|Datum:||19 AUG 1983|
|Fluggesellschaft:||United Air Lines|
|Baujahr:|| 1982-07-19 (1 year 1 months)|
|Triebwerk:|| 2 Pratt & Whitney JT9D-7R4D|
|Besatzung:||Todesopfer: 0 / Insassen: 8|
|Fluggäste:||Todesopfer: 0 / Insassen: 197|
|Gesamt:||Todesopfer: 0 / Insassen: 205 |
|Sachschaden:|| nicht beschädigt|
|Unfallort:||74 km (46.3 Meilen) W of Denver, CO (USA)
|Flugphase:|| Während des Fluges (ENR)|
|Betriebsart:||Inländischer planmäßiger Passagierflug|
|Flug von:||Los Angeles International Airport, CA (LAX/KLAX), USA|
|Flug nach:||Denver-Stapleton International Airport, CO (DEN/KDEN), USA|
PROBABLE CAUSE: "Fuel system, nozzle..contamination".
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 Los Angeles International Airport, CA to Denver-Stapleton International Airport, CO as the crow flies is 1356 km (848 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.