ASN Wikibase Occurrence # 30161
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| Date: | Saturday 6 May 2000 |
| Time: | 23:35 |
| Type: |  MBB BK 117A-4 |
| Owner/operator: | Petroleum Helicopters (PHI) |
| Registration: | N911NC |
| MSN: | 7026 |
| Year of manufacture: | 1983 |
| Total airframe hrs: | 5857 hours |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Location: | Cincinnati, OH -
 United States of America
|
| Phase: | Approach |
| Nature: | Ferry/positioning |
| Departure airport: | Cincinnati, OH (LUK) |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
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/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 24-Jul-2010 23:12 | Alpine Flight | 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] |
| 21-Dec-2019 18:58 | Aerossurance | Updated [Operator] |
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