January 15, 1980
During recent months, several instances of attaching bolt failure have
been reported. Investigation has shown that these bolts had been stretched
and broken by application of wrench-torque greatly exceeding the
recomendations published by Sensenich Corporation.
There are several ways in which this could have happened. For example:
When installing a metal propeller, be certain that the threads of the
bolt and of the bushings or nuts, are clean and dry (free of any
lubricant) . Always be certain that the wrench-torque applied is
correct for the bolt being installed and in the proper units.
Blank information decals can now be ordered from Sensenich Corporation
for propellers using 3/8" dia. or 1/2" dia. attaching bolts. It is
recommended that propeller information decals be applied to the inbound
blade section (approx. 5-1/2" from hub center) after repair of any
Sensenich Fixed-Pitch Metal Propeller.
These decals are available in packages of at least 20 decals at $.60
each, FOB, Lancaster, Pa., (price subject to change without notice) .
Please specify 3/8" and/or 1/2" dia. attaching bolts when ordering. Enclosed
is a sample of the identification decal for a propeller using 3/8" attaching
bolts.
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