Kathmandu, April 14 -- A relatively inexperienced co-pilot was at the controls when a Summit Air plane started to skid during its attempt to take off at Lukla airport, causing it to lose control and run into an exterior fence colliding with two parked helicopters, three officials familiar with the preliminary probe told the Post.

Two policemen and the co-pilot, Sujit Dhungana, were killed when the 19-seater aircraft crashed on Sunday morning. The incident is the first recorded accident in Nepal's civil aviation history in which an aircraft killed personnel on the ground.

Aviation authorities investigating into the crash told the Post that the co-pilot who was commanding the LET L-410 flight taking off from what has been dubbed one of th...