Accident
Last updated: 18 December 2014
Status:Schlussbericht
Datum:Sonntag 26 Mai 1991
Zeit:23:17
Flugzeugtyp:Silhouette image of generic B763 model; specific model in this crash may look slightly different
Boeing 767-3Z9ER
Fluggesellschaft:Lauda Air
Kennzeichen: OE-LAV
Werknummer: 24628/283
Baujahr: 1989-09-26 (1 year 8 months)
Betriebsstunden:7429
Anzahl Zyklen der Zelle:1132
Triebwerk: 2 Pratt & Whitney PW4060
Besatzung:Todesopfer: 10 / Insassen: 10
Fluggäste:Todesopfer: 213 / Insassen: 213
Gesamt:Todesopfer: 223 / Insassen: 223
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:5,6 km (3.5 Meilen) NNE of Phu Toey (   Thailand) show on map
Flugphase: Während des Fluges (ENR)
Betriebsart:Internationaler Linienflug
Flug von:Bangkok-Don Muang International Airport (BKK/VTBD), Thailand
Flug nach:Wien-Schwechat International Airport (VIE/LOWW), Österreich
Flugnummer: 004
Unfallbericht:
Lauda Air Flight NG004 was a scheduled service from Hong Kong (HKG) back to Vienna (VIE), Austria. An intermediate stop was made in Bangkok (BKK), Thailand. The flight departed Bangkok at 23:02 hours. Some five minutes after takeoff the pilot-in-command stated "that keeps coming on," referring to a REV ISLN advisory warning. This indication appears when a fault has been detected in the thrust reverser system. The crew discussed the REV ISLN indication for about four and one-half minutes. The co-pilot read information from the Airplane Quick Reference Handbook as follows: "Additional systems failures may cause in- flight deployment" and "Expect normal reverser operation after landing." The pilot-in-command remarked "....its not just on, its coming on and off," he said, "...its just an advisory thing...," and shortly thereafter stated, "could be some moisture in there or something." At 23:12, the co-pilot advised the pilot-in-command that there was need for, "a little bit of rudder trim to the left." Fifteen minutes and one second into the flight the co-pilot exclaimed, "ah reverser's deployed," accompanied by sound similar to airframe shuddering, sounds of metallic snaps and the pilot-in-command stating "here wait a minute." With the deployment of the nr.1 engine thrust reverser, engine thrust was reduced to idle. Aerodynamic effects of the reverser plume in-flight during the engine run down to idle resulted in a 25 percent lift loss across the wing. The airplane stalled and entered an uncontrolled descent. Buffeting, maneuvering overload, and excessive speed caused pieces of the rudder and the left elevator to separate. This was followed by the down-and-aft separation of most of the right horizontal stabilizer from maneuvering overloads, as the crew attempted to control the airplane and arrest the high-speed descent. A torsional overload then caused the separation of the vertical and left horizontal stabilizers. The loss of the tail resulted in a sharp nose-over of the airplane, producing excessive negative loading of the wing. A downward wing failure was probably followed by the breakup of the fuselage. The complete breakup of the tail, wing, and fuselage occurred in a matter of seconds. The wreckage fell in mountainous jungle terrain.

PROBALE CAUSE: "The Accident Investigation Committee of the Government of Thailand determines the probable cause of this accident to be uncommanded in-flight deployment of the left engine thrust reverser, which resulted in loss of flight path control. The specific cause of the thrust reverser deployment has not been positively identified."

Informationsquelle:
» Aviation Week & Space Technology 03.06.1991 (32), 10.06.91 (28-30)


Sicherheitsempfehlungen
The Thai Aircraft Accident Investigation Committee recommended that the United States FAA examine the certification philosophy of all airplane certificated with ground only engine thrust reverser systems to provide appropriate design safeguards to prevent in-flight deployment.

The Aircraft Accident Investigation Committee also recommends that the FAA revise the certification standards for current and future airplane flight recorders intended for use in accident investigation to protect and preserve the recorded information from the conditions of prolonged thermal exposure that can be expected in accidents which occur in locations that are inaccessible for fire fighting efforts.

Fotos

photo of Boeing 767-3Z9ER OE-LAV
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Map
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 Bangkok-Don Muang International Airport to Wien-Schwechat International Airport as the crow flies is 8375 km (5235 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.
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