Robinson R44 N716JL accident near Talkeetna, Alaska

Probable cause

The pilot's failure to maintain adequate clearance from snow covered terrain during an en route descent in flat light conditions, which resulted in controlled flight into terrain.

NTSB analysis

The pilot reported that he was conducting a passenger flight from a high elevation mountain heliport to the company's base airport. While the passengers were loading at the heliport, the weather deteriorated to 2 statute miles visibility in light snow and the ceiling was about 1000 ft. After the takeoff, the pilot was descending over a glacier and the helicopter unexpectedly skipped on the snow-covered surface of the glacier and it settled into deep snow. The helicopter subsequently rolled onto the right side and the main rotor blades, main rotor transmission and tail boom sustained substantial damage.

The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Text from the NTSB. Open the NTSB docket for ANC20CA023 for the full record.