NTSB Identification: NYC07LA026.
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Accident occurred Friday, November 10, 2006 in Snow Shoe, PA
Probable Cause Approval Date: 08/28/2008
Aircraft: Vogel Glastar 41, registration: N441AV
Injuries: 1 Fatal,1 Serious.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

While in cruise flight, the engine lost power, and the pilot performed a nighttime forced landing to a wooded area. A subsequent examination of the engine revealed a loose timing belt, and the idler pulley, upon which the cam belt would normally have run, was missing. There was also a broken stud in the location where the idler pulley should have been. The loose cam belt resulted in the camshafts being out of timing, allowing the valves to contact each other and bend. The original attach bolt for the missing idler pulley had been replaced by the airplane builder, who was not the current owner, with a 6-inch stud to mount an additional alternator. The mounting stud had been sleeved with a spacer to maintain a mounting distance between the alternator and the engine. The weight of the alternator and its mounting distance from the engine resulted in excessive stress to the mounting stud, which eventually broke.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The builder's improper installation of an additional alternator. Contributing to the accident were the night lighting conditions.

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