NTSB Identification: LAX05LA253.
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Accident occurred Monday, August 01, 2005 in Delano, CA
Probable Cause Approval Date: 02/26/2007
Aircraft: Malechek Q-200, registration: N870BM
Injuries: 1 Serious,1 Minor.

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

A propeller blade separated while the airplane was cruising at 9,500 feet mean sea level. The pilot then experienced a severe vibration and he shutoff the engine. During the ensuing forced landing, the airplane impacted objects short of the runway and came to rest inverted. A subsequent examination of the wood propeller revealed that it had separated at glue joints and delaminated. The pilot had torqued the propeller's attachment bolts to the 18-foot-pound value placarded on the propeller. The previous owner of the airplane had recommended torquing the bolts to 15-foot-pounds. A hair-line crack was found emanating from one of the propeller's attachment bolt holes. The FAA coordinator reported that the attachment bolt torquing sequence for the experimental airplane's propeller was not specified by the manufacturer.

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

the in-flight delamination and separation of a propeller blade for undetermined reasons.

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