Great Planes Learjet 40 Kit - GPMA0439 - Manual (Page 14)

D D 18. Drill an 11/64" hole through the main gear block
and the torque block as shown on the plan. This hole must
be drilled perpendicular to the main gear block and parallel
to W-3F.
D D 19. Fit the 5/32" music wire strut into the blocks and
fill the unused slot at either end of the main block with
scrap balsa. Remove the strut.
D D 20. Remove the wing from the board and check all
glue joints. Add a glue fillet to any joint that needs it. Sand
off any imperfections before proceeding.
D D 21. With the wing "right side up," pin (or weight) the
spar to the building board. Tack glue the die-cut 1/8" ply TE
jigs, J1 and J11, to the bottom of the TE at ribs W-1 and W-
11. Pin or weight the aft portion of the wing to be sure the TE
jigs and main spar are touching the building board. Add a 5/8"
shim of balsa under the trailing edge center to prevent the TE
from bowing downward.
D D 22. Glue the top 3/32" x 1-1/4" x 30" balsa TE sheet
in position.
D D 23. Glue the inboard and outboard LE sheeting in
position. Be sure the TE jigs, shim and spar remain in
contact with the building board.
D D 24. Insert the tip tank tongue and fit a 1/4" x 27/32" x
1" hardwood upper retainer block on top of the tongue
between W-10 and W-11. Glue this block between the ribs,
and remove the tongue immediately. Glue scrap balsa to the
top of the block, then sand it to match the top of the ribs.
D D 25. Install the 3/32" tip sheeting (from left over
3/32" balsa).
D D 26. Cut and glue 3/32" x 3/8" balsa cap strips to the
top of ribs W-5 through W-9.
D D 27. Sheet the wing center section with 3/32" x 3"
balsa cut from a 36" sheet.
D D 28. Remove the wing from the board and sand the
sheeting flush with W-1, W-11 and the trailing edge. Rough
sand the leading edge to shape.
D D 29. Turn the wing panel over and sheet the bottom
center section with 3/32" x 3" balsa. The sheeting must be
fitted around the main gear block or the retract mechanism
if using retracts.
Okay, clean up your building board, then build the second
wing panel over the other wing plan.
D 1. Cut a 3" piece from each 21" long tapered balsa
aileron. Check that the taper of the aileron stock matches
the shape of the airfoil. Glue the 3" pieces to the aft edge
of each wing panel, at the tip.
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