What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) While flying power line patrol at an altitude of 11,000 to about 12,000 feet asl (400 ft. AGL) encountered a down draft which exceeded the performance capability of the helicopter. Subsequently the aircraft came in hard contact with the snow covered ground.
As the FAA filed it
(-23) WHILE FLYING POWER LINE PATROL AT AN ALTITUDE OF 11,000 TO ABOUT 12,000 FEET ASL (400 FT. AGL) ENCOUNTERED A DOWN DRAFT WHICH EXCEEDED THE PERFORMANCE CAPABILITY OF THE HELICOPTER. SUBSEQUENTLY THE AIRCRAFT CAME IN HARD CONTACT WITH THE SNOW COVERED GROUND.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.