What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Accident occurred while helicopter air ambulance crew was attempting to make a night landing into a lz which was set up along a residential street by the ambulance ground crew. The approach was aborted while on short final due to unfavorable conditions within the lz. During the go-around procedure, wires were observed by the PIC at which time a climbing right turn was initiated. Once the wires were cleared, the a/c spun to the right at least 180 degrees. The PIC then lowered collective power in order to land the a/c within the vacant dirt lot located directly under him. During the attempt to land, the a/c landed approx. 10 degrees right skid low, and approx. 10 degrees nose low. This abrupt landing attitude in conjunction with a rigid rotor system caused a rolling motion (dynamic rollover) which could not be corrected. The a/c subsequently continued in a right roll eventually resting on its right side.
As the FAA filed it
(-23) ACCIDENT OCCURRED WHILE HELICOPTER AIR AMBULANCE CREW WAS ATTEMPTING TO MAKE A NIGHT LANDING INTO A LZ WHICH WAS SET UP ALONG A RESIDENTIAL STREET BY THE AMBULANCE GROUND CREW. THE APPROACH WAS ABORTED WHILE ON SHORT FINAL DUE TO UNFAVORABLE CONDITIONS WITHIN THE LZ. DURING THE GO-AROUND PROCEDURE, WIRES WERE OBSERVED BY THE PIC AT WHICH TIME A CLIMBING RIGHT TURN WAS INITIATED. ONCE THE WIRES WERE CLEARED, THE A/C SPUN TO THE RIGHT AT LEAST 180 DEGREES. THE PIC THEN LOWERED COLLECTIVE POWER IN ORDER TO LAND THE A/C WITHIN THE VACANT DIRT LOT LOCATED DIRECTLY UNDER HIM. DURING THE ATTEMPT TO LAND, THE A/C LANDED APPROX. 10 DEGREES RIGHT SKID LOW, AND APPROX. 10 DEGREES NOSE LOW. THIS ABRUPT LANDING ATTITUDE IN CONJUNCTION WITH A RIGID ROTOR SYSTEM CAUSED A ROLLING MOTION (DYNAMIC ROLLOVER) WHICH COULD NOT BE CORRECTED. THE A/C SUBSEQUENTLY CONTINUED IN A RIGHT ROLL EVENTUALLY RESTING ON ITS RIGHT SIDE.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.