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ASN Wikibase Occurrence # 233189
Last updated: 23 November 2020
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Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Aerospatiale AS 350B2 Ecureuil
Owner/operator:Hillsborough County Sheriffs Office
Registration: N188FS
C/n / msn: 7863
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:Tampa Executive Airport (KVDF), Hillsborough County, FL -   United States of America
Phase: Landing
Departure airport:Tampa-Peter O. Knight Airport, FL (TPF/KTPF)
Destination airport:Tampa Executive Airport, FL (KVDF)
Investigating agency: NTSB
The flight instructor in the helicopter reported that he directed the pilot receiving instruction to conduct an autorotation with a 180° turn, followed by a power recovery. Abeam the departure end of runway, he moved the throttle lever from the “fly” position to idle. While conducting the maneuver, the pilot overshot the runway and aligned the helicopter with the parallel taxiway. Upon realizing that the helicopter was not in the correct position, the pilots chose to abort the maneuver and perform a go-around. While the pilot continued to fly the helicopter, the instructor inadvertently moved the throttle lever from idle aft toward the “off” position and then forward to the “fly” position. The engine experienced a total loss of power, and the instructor adjusted the throttle to no avail. As the helicopter descended, the pilot requested that the instructor “get on the controls.” The instructor took the controls, conducted a power-off autorotation, and landed the helicopter on the taxiway. The helicopter skidded about 180 ft, departed the taxiway onto adjacent grass, and came to rest in a drainage ditch. The instructor reported that there were no preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation. The Federal Aviation Administrator inspector who examined the helicopter reported that the left antivibrator mount beam had sustained substantial damage.

Probable Cause: The flight instructor's inadvertent throttle reduction below idle, which resulted in a total loss of engine power and subsequent impact with terrain following a power-off autorotation.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Download report: Final report

Revision history:

23-Feb-2020 21:09 Captain Adam Added
01-Sep-2020 16:57 ASN Update Bot Updated [Time, Operator, Total occupants, Departure airport, Destination airport, Source, Narrative, Accident report, ]
01-Sep-2020 19:38 harro Updated [Departure airport, Destination airport, Narrative, Accident report, ]
23-Nov-2020 09:44 Aerossurance Updated [Aircraft type, Phase, Accident report]

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