Beech K35 N803R accident near Longmont, Colorado

Probable cause

A total loss of engine power for reasons that could not be determined because a postaccident examination of the airplane revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation.

NTSB analysis

After returning to the airport from a local orientation flight, the airline transport pilot completed two touch-and-go landings. During the initial climb after the second touch-and-go, the engine began running roughly and then experienced a total loss of power about 300 ft above ground level; the pilot did not notice anything unusual with the instruments. He descended for a forced landing, flared the airplane, and then landed hard in a field, which resulted in substantial damage to the fuselage and wings.

A postaccident examination of the engine and airframe revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation. Thus, the reason for the total loss of engine power could not be determined.

Text from the NTSB. Open the NTSB docket for CEN18LA076 for the full record.