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Accident description
Last updated: 10 October 2015
Date:Monday 21 July 1997
Type:Learjet 31
Operator:Singapore Airlines
Registration: 9V-ATD
C/n / msn: 31-033B
First flight: 1993
Engines: 2 Garrett TFE731-2-3B
Crew:Fatalities: 2 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 2 / Occupants: 2
Airplane damage: Damaged beyond repair
Location:48 km (30 mls) S of Ranong (   Thailand)
Phase: En route (ENR)
Departure airport:Phuket International Airport (HKT/VTSP), Thailand
Destination airport:Ranong Airport (UNN/VTSR), Thailand
The Learjet crew consisted of an instructor and a trainee pilot. For the short flight from Phuket to Ranong the crew were supposed to carry out the approach briefing before takeoff. They failed to do so, which left them little time en route to carry out the procedure and cross-checking the distance and altitude during the flight. The instructor misinterpreted the Ranong DME distance and caused the trainee pilot to descend below minimum sector altitude in unfavourable weather conditions. The aircraft consequently flew into high terrain.

Navigational error
Controlled Flight Into Terrain (CFIT) - Mountain

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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 Phuket International Airport to Ranong Airport as the crow flies is 186 km (117 miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs 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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