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ASN Wikibase Occurrence # 199069
Last updated: 2 August 2020
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Date:16-SEP-2016
Time:08:20
Type:Silhouette image of generic COUR model; specific model in this crash may look slightly different
Helio H-295 Super Courier
Owner/operator:Wright Air Service
Registration: N6464V
C/n / msn: 1414
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:Fairbanks, AK -   United States of America
Phase: Unknown
Nature:Unknown
Departure airport:Fairbanks, AK
Destination airport:Fairbanks, AK
Investigating agency: NTSB
Narrative:
The airline transport pilot was departing from a remote unimproved airstrip. He stated that, as he initiated the takeoff, everything seemed normal. About 300 ft into the takeoff roll, the airplane veered sharply left, exited the airstrip, and impacted brush and trees, which resulted in substantial damage to the fuselage and left horizontal stabilator. A postaccident examination of the airplane revealed that the tailwheel had separated from its attachment point and folded underneath the empennage.
Visual and magnified optical examinations revealed deformation and fracture patterns consistent with an overstress failure. Although fatigue cracks were observed in the fractured left arm of the tailwheel A-frame, they were relatively small and would not likely have caused a failure without abnormal loading. Additionally, the fractures in the left arm initiated not only at the fatigue cracks but also at locations away from the fatigue cracks, consistent with an overstress fracture. It is likely that the tailwheel A-frame fractured due to excessive side loads on the frame, which led to the tailwheel separating and the subsequent loss of control.

Probable Cause: Excessive side loads imposed on the tailwheel A-frame during the takeoff roll, which resulted in a separation of the tailwheel and the subsequent loss of directional control.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20160920X74309&key=1


Images:

Photo of N6464V courtesy AirHistory.net


Bellingham - International (KBLI / BLI)
August 1980; (c) Gary Vincent

Revision history:

Date/timeContributorUpdates
19-Aug-2017 16:48 ASN Update Bot Added

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