December 14, 1992
PROPELLER INSTALLATION, TORQUING PROCEDURES, and MAINTENANCE
ALL Kitfox™ OWNERS
SKYSTAR AIRCRAFT CORPORATION
issues have recently surfaced regarding the installation and
maintenance of propellers installed on Kitfox™ aircraft. Proper
propeller installation is absolutely essential to safe flight. Regular
maintenance checks should be performed every 25 hours , at annual
inspections, and 100 hour inspections; in addition to regular
pre-flight inspections. This letter will review the significant facts
regarding the care and installation procedures, torquing sequence,
maintenance, and the use of SkyStar spinners with propellers other
Kitfox™ construction manual directs the builder to install three
drive lugs into the prop flange to help secure the bulkhead; current
information from GSC indicates that “six”
drive lugs are now
until this Letter, all Kitfox™ spinner bulkheads have been drilled
for three drive lugs and six bolts. The application to six drive lugs
will require each builder to drill the three extra holes in the
spinner bulkhead (these holes already exist in the propeller flange
and bulkhead) . With three studs already in place, attach the spinner
bulkhead on the flange and mark the other three hole from the back.
These lug holes should be drilled with a Letter size “N” drill.
The use of Loctite is recommended on these studs.
drive lugs are available through SkyStar for a cost of $1.50 each,
is absolutely essential, to torque the GSC propeller mounting bolts to
the exact values dictated by instructions from GSC, for safe flying. If
the GSC Ground Adjustable propeller is not torqued properly, it is
possible for the blades to become loose, with a random pitch change
occurring that will cause considerable vibration.
current spinner that is supplied by SkyStar Aircraft is designed
specifically for use with the GSC propeller hub arrangement and is not
applicable with any other propeller installation.
have received several reports of SkyStar spinners cracking, and in some
cases actually departing the airplane when installed on a non-GSC prop.
For those who are using the IVO Prop, the small “skull cap” provided
by IVO works well and should be used in place of the SkyStar spinner.
feel free to contact SkyStar’s Customer Service Department for parts
orders, or the Technical Department for questions concerning this
Service letter at: Ph (208) 466-1711 or Fax (208)466-7194.