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ASN Wikibase Occurrence # 206486
Last updated: 25 September 2019
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Date:12-OCT-2017
Time:23:35
Type:Silhouette image of generic BK17 model; specific model in this crash may look slightly different
MBB BK 117
Owner/operator:Osf Aviation Llc.
Registration: N140SF
C/n / msn: 9389
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Canton, IL -   United States of America
Phase: Unknown
Nature:Training
Departure airport:Peoria, IL (PIA)
Destination airport:Canton, IL (CTK)
Investigating agency: NTSB
Narrative:
The helicopter flight instructor reported that he was training a new company pilot at night, and they were using night vision goggles. He added that, while in a hover, he attempted to demonstrate the use of the controllable search light to the pilot in the right seat.
The flight instructor added that, “to adjust the light, I took the [left] cyclic in my left hand which would normally be holding the left collective and attempted to reach the control switch for the light and grabbed the throttles of the right collective with my right hand. My right hand would normally be on the left cyclic.” He further added that he then inadvertently pushed down on the collective, and the helicopter began to settle on the runway. He reported that in response “[his] reflex was to pull up with [his] left hand (which would normally be on the collective),” and when he did so the helicopter moved rearward. Subsequently, he “pushed the cyclic forward to correct” the rearward movement, but in doing so, the helicopter touched down hard, and the main rotor impacted the upper wire strike protection unit.
The main rotor sustained substantial damage.
The flight instructor reported that there were no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation.


Probable Cause: The flight instructor's incorrect cyclic control during a hover, which resulted in a hard landing.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20171016X23330&key=1

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 4 months
Download report: Final report


Revision history:

Date/timeContributorUpdates
22-Feb-2018 19:39 ASN Update Bot Added

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