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ASN Wikibase Occurrence # 42593
Last updated: 28 August 2021
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Date:17-MAY-1999
Time:16:08
Type:Silhouette image of generic B06 model; specific model in this crash may look slightly different
Bell OH-58A Kiowa
Owner/operator:Missouri State Highway Patrol
Registration: N77MP
MSN: 72-21187
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Poplar Bluff, Missouri -   United States of America
Phase: En route
Nature:Unknown
Departure airport:Malden, MO (MAW)
Destination airport:
Investigating agency: NTSB
Narrative:
The helicopter departed controlled flight while en route to the Poplar Bluff Airport, Poplar Bluff, Missouri. A witness stated that the helicopter appeared to be 450 feet agl. The helicopter was then reported by the witness to have made three to four rotations during its descent. The OH-58A/C lists procedures for the 'COMPLETE LOSS OF TAIL ROTOR THRUST'. Examination of the tail rotor drive shaft revealed a 45-degree torsional fracture. There was rotational scoring near the fracture area on the interior housing for the tail rotor drive shaft. An elastic material with navy blue yarns was found wrapped around the tail rotor. The yarns were consistent with those of a navy blue warm up jacket found along the reported flight path. The helicopter's entry doors were removed for the flight.
Probable Cause: The tail rotor's impact with the blue warm-up jacket and the subsequent overload of the tail rotor drive shaft. A contributing factor was the absence of the helicopter's entry doors.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X18711&key=1
FAA register: 2. http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=77MP


Revision history:

Date/timeContributorUpdates
24-Oct-2008 10:30 ASN archive Added
09-Apr-2015 22:08 Dr. John Smith Updated [Time, Cn, Location, Nature, Departure airport, Destination airport, Source, Narrative]
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
26-Nov-2017 15:16 ASN Update Bot Updated [Cn, Nature, Departure airport, Destination airport, Source, Narrative]

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