Loose B-Nut: Accident During Helicopter Maintenance Check Flight
The NTSB report that on 1 January 2014, was being flown on a post-maintenance check flight. When on short finals at about 200 feet above the ground and an airspeed of 40 to 50 knots, the engine flamed-out.
The pilot lowered the collective to initiate an autorotation, but was not able to successfully complete the landing. The tail boom touched the ground first and a hard landing ensued.
The pilot, the sole occupant, was uninjured but the helicopter, which came to rest on its right side, sustained substantial damage.
…examination of the wreckage, a main fuel supply line B-nut fitting was found without the safety wire, and the nut was loose when turned by hand.
Original Article Courtesy Aerosurance : ORIGINAL ARTICLE
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