Great Planes Learjet 40 Kit - GPMA0439 - Manual (Page 13)

D D 10. Fit and glue the 3/32" x 1-1/4" x 30" trailing edge
sheeting in position across the aft edge of the wing.
D D 11. Sheet the outboard leading edge with the balsa
you trimmed off when cutting the LE sheets. Glue it in place.
D D 15. Fit the retract mechanism in place, trimming the
plywood mounting plates as required to allow the retract
to function properly. Drill 3/32" mounting holes and
temporarily install the retract with four #4 x 3/8" sheet
metal screws.
D D 12. Slide the die-cut 1/8" ply tip tank tongue in place
through the slots in W-11 and W-10. Fit a 1/4" x 27/32" x 1"
balsa tip tank retainer block on top of the tongue between
W-10 and W-11 and carefully glue it to the two ribs.
Remove the tongue immediately so that you don't
accidentally glue it to the block. Glue a piece of scrap 3/32"
balsa on top of the hardwood block and sand it to match
the shape of the ribs.
D D 13. Cut and install the tip sheeting (from left over
3/32" balsa) between W-10 and W-11.
Use the instructions that follow to install the landing gear
mounting rails of your choice (for fixed or retractable).
D D 16. Use 30-minute epoxy to glue the 7/16" x 5/8" x
4-5/16" hardwood main gear block into the notches in W-3
and W-4. The inboard end should overhang W-3 by 3/4"
and the "groove" faces away from the building board.
D D 14. Use 30-minute epoxy to glue the 1/4" x 3/4" x
3-5/8" plywood retract mounting plates into the slots in
W-3 and W-4.
D D 17. Use 30-minute epoxy to glue the 5/8" x 5/8" x 5/8"
hardwood landing gear torque block to the ungrooved side
of the main block, against the root face of W-3F. Glue the
5/8" wedge shaped landing gear gusset on the ungrooved
side of the main block, against the root face of W-4F with
30-minute epoxy.
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