20200201002999A

Accident · Substantial damage

FAA accident report · Hiller UH-12E · Dinosaur, CO · February 1, 2020

Date
February 1, 2020 · 14:00 local
Place
Dinosaur, CO
Phase of flight
Cruise/Level Flight
Operating rules
Air taxi and commuter (Part 135)
Operator
DQMA
Damage
Substantial damage
Aircraft
N7173S
NTSB investigation
NTSBCEN20LA073
Reported as
Hiller UH-12E
Reported engine
Allison 250-C20 series
People aboard
3
Fatal injuries
0
Other injuries
0
Pilot’s certificate
Commercial pilot
Pilot’s flight hours
15,300 total

From the FAA’s Accident/Incident Data System (AIDS), through its Aviation Safety Information Portal, as reported. The NTSB investigates accidents separately, and its record of an accident is the fuller one. The aircraft is matched to the registry by N-number and event date, checked against the reported make and model; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

What happened

The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.

Pilot and two passengers departed from the pilot?s home heading to one of the passenger?s ranch. Enroute and at about 700 ft AGL, the pilot heard a loud grinding sound and immediately lost engine power. The pilot initiated an auto-rotation to the ground and landed in approximately 24 inches of snow. During landing, the rear skids touched the snow first and because of the slope of the ground under the snow, the front skids dropped about 12 inches which forced the tail boom up into the turning main rotor blades.

The helicopter is currently in an area that's inaccessible to investigators. NTSB, airframe, and engine investigators will conduct their investigation in late may 2020 to determine the probable cause.

As the FAA filed it

PILOT AND TWO PASSENGERS DEPARTED FROM THE PILOT?S HOME HEADING TO ONE OF THE PASSENGER?S RANCH. ENROUTE AND AT ABOUT 700 FT AGL, THE PILOT HEARD A LOUD GRINDING SOUND AND IMMEDIATELY LOST ENGINE POWER. THE PILOT INITIATED AN AUTO-ROTATION TO THE GROUND AND LANDED IN APPROXIMATELY 24 INCHES OF SNOW. DURING LANDING, THE REAR SKIDS TOUCHED THE SNOW FIRST AND BECAUSE OF THE SLOPE OF THE GROUND UNDER THE SNOW, THE FRONT SKIDS DROPPED ABOUT 12 INCHES WHICH FORCED THE TAIL BOOM UP INTO THE TURNING MAIN ROTOR BLADES.

THE HELICOPTER IS CURRENTLY IN AN AREA THAT'S INACCESSIBLE TO INVESTIGATORS. NTSB, AIRFRAME, AND ENGINE INVESTIGATORS WILL CONDUCT THEIR INVESTIGATION IN LATE MAY 2020 TO DETERMINE THE PROBABLE CAUSE.

NTSB investigation

The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.