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ASN Wikibase Occurrence # 30161
Last updated: 22 April 2019
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Date:06-MAY-2000
Time:23:35
Type:Silhouette image of generic BK17 model; specific model in this crash may look slightly different
MBB BK 117A-4
Owner/operator:Petroleum Helicopters Inc.
Registration: N911NC
C/n / msn: 7026
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Cincinnati, OH -   United States of America
Phase: Approach
Nature:Ferry/positioning
Departure airport:Cincinnati, OH (LUK)
Destination airport:
Investigating agency: NTSB
Narrative:
The pilot stated he approached the lighted rooftop helipad from the southwest, at night, with light winds. The helipad and hangar were just ahead of him, and he initiated a right pedal turn to align the helicopter towards the south. He heard a loud bang, and the helicopter rotated uncontrollably, nose right. He lowered the collective, and the helicopter struck the landing area. Examination revealed the tail rotor blade ends were fragmented, and marks on the top corner of the hangar were similar to a tail rotor blade strike. Due to other helicopters parked on the ramp, the only approach was from the southwest. Winds were estimated to be from 220 degrees at 10 knots with gusts to 15 knots. Examination of the hydraulic pump and hydraulic tail rotor actuator found no evidence of failure or malfunction. Personnel reported the windsock would occasionally get caught on its support structure, and not indicate the true nature of the wind. There was no other wind information available to the pilot.
Probable Cause: the pilot's misjudgment of his closure rate, while turning to land on the rooftop helipad, which resulted in a collision with the building. Factors in the accident were the tailwind and the stuck windsock.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X21094&key=1


Revision history:

Date/timeContributorUpdates
27-Sep-2008 01:00 ASN archive Added
24-Jul-2010 23:12 FLYINGBROTHER1 Updated [Time, Aircraft type, Cn, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative]
20-Aug-2010 03:16 TB Updated [Aircraft type]
20-Aug-2010 04:11 TB Updated [Operator]
22-Nov-2012 10:04 TB Updated [Time, Phase, Destination airport, Source, Narrative]
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
12-Dec-2017 18:45 ASN Update Bot Updated [Operator, Nature, Departure airport, Destination airport, Source, Narrative]

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