Accident Overview
On a flight from Medan to Banda Aceh, the crew encountered poor weather conditions with limited visibility due to clouds. The crew informed air traffic control that the aircraft was at an altitude of 8,500 feet. Approximately three minutes later, the aircraft struck the slope of Mt Kapur, located about 130 kilometers northwest of Medan. The wreckage was located a few hours later, and all 14 occupants were killed.
Investigation Findings
The official investigation determined the probable cause to be controlled flight into terrain. The crew was flying below the minimum prescribed altitude in poor visibility caused by clouds. Published procedures for the route specified a minimum altitude of 9,500 feet for the first 160 kilometers, followed by 11,500 feet for the remaining distance. At the time of the accident, the sky was overcast from 4,000 to 12,000 feet, and the crew was evidently unaware that their altitude was insufficient.
Operational Context
The aircraft was operating between two cities in a region known for challenging meteorological conditions. The crew's deviation from the established minimum altitude procedures occurred in an environment where cloud cover reduced visual references, likely contributing to their lack of situational awareness regarding terrain proximity.