Chapter 7 - Flap
7.2 - Flap actuation rail
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7.2
Flap actuation rail
See figure for location of rail section and drill 2 holes using flap drive rail as
template. The lower corner of the flap rail should be aligned with the lower edge of the
rib, with about 1/16 inches of clearance to allow for small adjustments, and the leading
edge located 6 inches behind the hinge line. Position this section of rail on the rib with
the orientations between the two parts. When the configuration is satisfactory, drill the
holes as mentioned and place anchor nuts in these on the inner side of the rib. Set the rail
aside and fill the holes with wax for future glass work.
7.3
Preparation and bonding of the top coat
Select the appropriate top coat to be used for this flap, and remove any plastic, peel
ply, or any other debris observed. Trim top of liner as required and position in bottom
mount. Do not trim the leading edge radius this time.
Test the fit of the top casing and the trailing edge, and note any potential gap or
interference with the casing fit. This is also a good time to check the flap-to-wing fit
before gluing the undercoat. Remove from the bench and temporarily join the coatings
with tape and fit on the handle to test the same.
Adjust if necessary by sanding the top of the spar and ribs. Fix any noted fit issues,
clean all loose material. Prepare for gluing surfaces by cleaning and roughing the gluing
surfaces. Re-attach the mount to the flat table. Mark the location of the ribs and spar in
the