Date: May 26, 1991
Time: 2317
Location: Near Ban Nong Rong, Thailand
Operator: Lauda Air
Flight #: 004
Route: Bangkok - Wien, Austria
AC Type: Boeing B-767-3Z9ER
Registration: OE-LAV
cn / ln: 24628/283
Aboard: 223   (passengers:213  crew:10)
Fatalities: 223   (passengers:213  crew:10)
Ground: 0
Summary: Twelve minutes after takeoff the crew received a visual REV ISLN advisory warning which indicated that an additional system failure may cause deployment of the No. 1 engine thrust reverser. No action was taken since the manual indicated "No Action Required". Just before reaching FL 310 during a climb, there was an uncommanded deployment of the No. 1 engine thrust reverser. The aircraft stalled, went into a steep high speed dive, broke apart at 4,000 feet and crashed into the jungle 70 miles northwest of Bangkok. Failure of the reverse thrust isolation valve. Following the accident Boeing made modifications to the thrust reverser system. The aircraft was named Wolfgang Amadeus Mozart.

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