Check valve

July 9, 2012 - 10:25am

Sierra Nevada Corp. has selected Parker Aerospace Gas Turbine Fuel Systems division’s thermal-management equipment to cool and heat its autonomous landing system (HALS) on Sikorsky UH-60 Black Hawk helicopters. Sierra Nevada has a contract to fulfill the degraded visual environments (DVE) operational-needs statement issued by the U.S. Army aviation-networks mission-planning program directorate.

May 29, 2008 - 10:29am

BEECH 1900D, ROCHESTER, N.Y., JUNE 3, 2000–The Safety Board determined probable cause for a gear-up landing by a CommutAir Beech 1900D during a regularly scheduled flight. According to the NTSB, “The reversal of landing gear hydraulic lines by company maintenance personnel [caused the failure].

July 6, 2007 - 5:56am

MD 600N, Vicksburg, Miss., Feb. 6, 2007–The NTSB said the loss of engine power on the MD 600, which landed hard on a logging road, was due to fuel starvation because the fuel transfer check valve was stuck in the closed position. The pilot was en route to refuel the helicopter, cruising at 115 knots at 500 feet agl, when the engine quit. The pilot autorotated and landed on the road, surrounded by tall trees.

 
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