Accident Hughes 369D N11AS, 24 Apr 2007
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ASN Wikibase Occurrence # 285005
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Time:07:30 LT
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different    
Hughes 369D
Owner/operator:Aerial Solutions Incorporated
Registration: N11AS
MSN: 790541D
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Whiteville, North Carolina -   United States of America
Phase: Unknown
Departure airport:Whiteville-Columbus County Municipal Airport, NC (KCPC)
Destination airport:Whiteville-Columbus County Municipal Airport, NC (KCPC)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
According to the pilots, the helicopter was at an altitude between 400 and 500 feet above ground level and at an airspeed between 75 and 80 knots when the engine lost power. The instructor-pilot took control of the helicopter, jettisoned the external load, and autorotated to a nearby corn field. He said that the engine "didn't sound like it was running and the engine out was activated." The helicopter touched down and slid 6 to 8 feet when one of the skids dug into the earth. The helicopter turned to the left about 45 degrees and rolled over on its right side. It was later found that the power turbine governor (PTG) spring had fractured in fatigue. The fracture originated from a drawing mark and was the result of deficiencies in the manufacturing process. The PTG spring "provides force opposing those exerted by rotating flyweights on the position of the governor lever. Failure of the spring would result in a false pneumatic signal to the fuel control and a corresponding reduction in fuel flow. The effect of the false pneumatic signal would be a pronounced reduction in fuel flow. At the reduced fuel flow, the engine could not sustain flight, and the symptoms of the reduced fuel flow might easily be interpreted by the pilot as an engine failure."

Probable Cause: A partial loss of engine power due to fatigue fracture of the power turbine governor spring, causing a false pneumatic signal to the fuel control and a corresponding reduction in fuel flow.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years
Download report: Final report

Revision history:

01-Oct-2022 16:30 ASN Update Bot Added

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