Incident Overview
A training flight operating between Phuket and Ranong ended when the aircraft collided with mountainous terrain during its descent. The accident occurred 48 kilometers south of Ranong Airport as the crew attempted to land in adverse weather conditions.
Sequence of Events
The flight was part of a training mission from Phuket. While descending toward Ranong, the crew lost situational awareness regarding their altitude. The aircraft struck the slope of a mountain before reaching the airport. Both pilots on board were killed.
Official Findings
The investigation determined that the crew failed to conduct the required approach briefing prior to takeoff. This oversight left them with insufficient time en route to properly execute procedures and cross-check distance and altitude parameters during the flight. Additionally, the instructor misinterpreted the Ranong DME distance, leading the trainee pilot to descend below the minimum sector altitude while operating in unfavorable weather conditions.