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ASN Wikibase Occurrence # 67844
Last updated: 11 December 2017
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Date:09-AUG-2009
Time:12:00
Type:Brantly B-2B
Owner/operator:Private
Registration: N9023Z
C/n / msn: 2021
Fatalities:Fatalities: 0 / Occupants: 1
Airplane damage: Substantial
Category:Accident
Location:In field Off Lake Shore Dr Martinsville, IN -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Training
Departure airport:Martinsville, IN
Destination airport:Martinsville, IN
Investigating agency: NTSB
Narrative:
The pilot was practicing solo 180-degree autorotations in preparation for a private pilot helicopter add-on rating. During the accident autorotation, the helicopter was in a left turn at an altitude of 500 feet above ground level(agl). The helicopter exited the turn "a little low and lost some rotor speed." While attempting to recover the low rotor speed, the pilot had to extend his glide path more than he anticipated due to approaching terrain and obstacles, which in turn slowed the forward airspeed. The pilot reported, "Of course I wish I had abandoned the auto at this point. I flared [the helicopter] but with high density altitude and the out of ground effect of the soybeans, I still entered the thick-drilled soybeans, which piled up on my right skid." The helicopter then rolled over and came to rest on its right side. Examination of the helicopter revealed the main rotor blades were destroyed and the fuselage was buckled. No mechanical anomalies were noted with the helicopter.
Probable Cause: The pilot's improper recovery during the autorotation. Contributing to the accident was the pilot's delayed remedial action to abort the practice autorotation.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20090810X41334&key=1


Revision history:

Date/timeContributorUpdates
10-Aug-2009 08:51 89.50.0.25 Added
11-Aug-2009 23:16 gwog Updated
12-Aug-2009 13:24 RobertMB Updated
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
02-Dec-2017 15:59 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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