Pilot Debrief

BELL 206B near Rocky Mount, MO — 2010-08-13

Final reportCEN10LA477
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Date
2010-08-13
Location
Rocky Mount, MO, USA
Aircraft
BELL 206B
Registration
N54BE
Category
Helicopter
Highest injury
None
Fatalities
0
Phase of flight
Landing

Probable cause

A dynamic rollover inadvertently induced by the pilot during landing.

NTSB narrative

The pilot reported that the approach and landing were normal. After landing, he lowered the collective and began to decrease engine power by manipulating the throttle closed. Before the throttle was completely closed, the helicopter suddenly rolled to the right and came to rest on its right side, incurring damage to the airframe, main rotor, and tail boom. A postaccident examination did not reveal any anomalies consistent with a preimpact failure or malfunction. Dynamic rollover is the tendency of a helicopter to continue rolling when the critical angle is exceeded, if one skid is on the ground, and the helicopter is pivoting around that point. Dynamic rollover is possible when a skid is caught by a projection on the surface or when landing on a slope.

Analysis

Primary failure mode
Loss of control
First missed decision gate
Properly managing throttle during landing could have prevented the roll.

NTSB coding

Evidence available

  • 3 docket documents
View NTSB final reportView NTSB docket

Docket documents3

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