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ASN Wikibase Occurrence # 69844
Last updated: 26 April 2019
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Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Aérospatiale AS 350BA Ecureuil
Owner/operator:Omni Flight Helicopters Inc
Registration: N617LH
C/n / msn: 2140
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:San Carlos Apache Airport, 8 miles SE of Globe, Gila County, Arizona -   United States of America
Phase: Landing
Departure airport:Mesa, AZ (IWA)
Destination airport:Globe, AZ (P13)
Investigating agency: NTSB
During a night vision goggle (NVG) training flight, the flight instructor initiated a simulated hydraulic failure on the downwind leg for landing. The flight instructor stated that during this maneuver, the pilot receiving instruction did not properly adjust the trim and did not maintain sufficient air speed. The helicopter slowed to about 20 knots, which was half the speed the flight instructor expected. When the flight instructor heard what he believed to be the low rotor horn and heard the pilot exclaim “uh-oh,” the flight instructor tried to regain control of the helicopter; however, the helicopter impacted the ground hard. Interviews with the pilot and instructor established that both were manipulating the controls after the initial loss of control and that no positive exchange of control had occurred. The pilot reported that the last time he had performed a simulated hydraulic failure was almost 1 year before the accident and that he had never performed such a procedure or had one demonstrated while operating with NVGs. The pilot and instructor reported no in-flight abnormalities with the helicopter before the initiation of the simulated hydraulic failure, and postaccident examination of the hydraulic system components revealed no abnormalities that would have precluded normal operation.
Probable Cause: The pilot receiving instruction’s failure to maintain adequate airspeed or control of the helicopter during a simulated hydraulic failure maneuver, which resulted in a hard landing. Contributing to the accident was the flight instructor’s delayed remedial actions and the lack of a positive exchange of control.


FAA register: 2. FAA:

Revision history:

05-Nov-2009 05:51 slowkid Added
05-Nov-2009 07:34 RobertMB Updated
07-Feb-2012 11:53 Dr. John Smith Updated [Time, Operator, Location, Departure airport, Destination airport, Source, Damage, Narrative]
27-Jul-2014 00:28 Dr. John Smith Updated [Time, Location, Destination airport, Source, Damage, Narrative]
27-Jul-2014 00:29 Dr. John Smith Updated [Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
02-Dec-2017 17:48 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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