The engine installed in this aircraft was a "Hirth
Model 2706," and the propeller was a "Tennessee Model 58/46." An abnormal
noise was heard during flight, and the propeller failed. An off airport
landing was made. The aircraft sustained substantial damage.
During an investigation, an engine air cleaner assembly
was discovered to be missing. The submitter speculated that the air
cleaner assembly came loose, struck the propeller, and caused this
The air cleaner was a "K&N Model," and a part
number was not available. Prior to flight, the engine/propeller components
should be closely inspected for security.
Part total time-96 hours.
K & N airfilters supplied for
AIRCRAFT use have tabs built into the filter for connecting the airfilter
to the carburetor using safety wire.
It is necessary to drill the small flat
plate on the rear of the Bing 54 carb to allow insertion of the safety