Thailand

The crew was completing a local training mission at Nakhon Ratchasima AFB. After takeoff, in unknown circumstances, the single engine aircraft crashed in Nong Phai Lom, near the airport. Both pilots were killed.

Crashed in unknown circumstances. There were no casualties.

The crew was engaged in a local post maintenance test flight at Bangkok-Don Mueang Airport. After takeoff, while in initial climb, the crew encountered technical problems with the left main gear. After being cleared by ATC, the crew decided to return for an emergency landing and made a turn then completed a belly landing. The aircraft came to rest on the main runway and was damaged beyond repair. Both pilots escaped uninjured.

During the days prior to the accident, various problems with the pitch-trim system and the horizontal stabilizers were noticed and reported. Repairs were conducted by technicians from the Royal Thai Air Force but apparently, not according to the Boeing published procedures, so a Boeing engineer was dispatched in Thailand to proceed to controls and tests. On approach to Muang Khon Kaen Airport, the aircraft started to pitch up and down then stalled. The crew increased engine power and regained control for few seconds when the aircraft stalled a second time few seconds later. The crew elected to regain control and to reduce the rate of descent when the aircraft entered an uncontrolled descent and crashed in a rice paddy field located few km from the airport. The aircraft was destroyed and all six occupants were killed. The aircraft has the dual registration 33-333 (military) and HS-TGQ (civil).

After landing at Bangkok-Don Mueang Airport, the aircraft went out of control, veered off runway to the left, struck a fence and crossed a drainage ditch before coming to rest. There were no casualties.

Lauda Air Flight 004 (NG004) was a scheduled passenger flight from Hong Kong to Vienna, Austria with an en route stop in Bangkok, Thailand. The flight departed Bangkok at 1602 hours on May 26, 1991 for the final flight sector to Vienna Austria. All pre-flight, ground, and flight operations appear routine until five minutes and forty five seconds after the cockpit voice recorder (CVR) recorded the sounds of engine power being advanced for takeoff. At this point a discussion ensued between the crew members regarding an event later identified as a crew alert associated with a thrust reverser isolation valve. The crew discussed this alert for some four and one half minutes. The Quick Reference Handbook (QRH) was consulted to determine appropriate crew actions in response to the alert. No actions were required, and none were identified as being taken. Ten minutes and twenty seconds into the flight the co-pilot advised the pilot-in-command of the need for rudder trim to the left. The pilot-in-command acknowledged the co-pilot's statement. Fifteen minutes and one second into the flight, the co-pilot stated "ah reverser's deployed." Sounds similar to airframe shuddering were then heard on the CVR. Twenty nine seconds later the CVR recording ended with multiple sounds thought to be structural breakup. Flight conditions were recovered from non-volatile memory in the left engine electronic engine control (EEC). At the suspected point of reverser deployment, the EEC readout indicated that the airplane was at an approximate altitude of 24,700 feet, a speed of Mach 0.78, and developing climb power. The airplane crashed in mountainous jungle terrain at 14 degrees 44 minutes North latitude and 99 degrees 27 minutes East longitude at approximately 1617 hours. Night time visual meteorological conditions prevailed. All 223 occupants were killed.

Crashed in unknown circumstances, injuring both pilots.

On final approach to Koh Samui Airport runway 35, the aircraft entered an area of heavy rain falls. As the crew was unable to locate the runway, the captain decided to initiate a go-around procedure. With flaps fully extended, the crew increased power and started to gain height when the aircraft rolled to the left to an angle of 75° then entered an uncontrolled descent and crashed at a speed of 147 knots about 5 km short of runway threshold. The aircraft disintegrated on impact and all 38 occupants were killed.

Crashed on Mt Hew while engaged in a spraying mission. The pilot, sole on board, was killed.

While completing a spraying mission, the pilot lost control of the airplane that crashed in a lychee plantation located in Doi Pun, in the region of Chiang Mai. The aircraft was destroyed and the pilot was injured.