Extra 300LT, Maintenance Manual

Page: 333 / 551

CHAPTER 51
PAGE 40 PAGE DATE: 21. March 2014
MAINTENANCE MANUAL EXTRA 300LT
(ref. Chapter 51-30-01). Record quantities of parts to be
mixed, ambient air temperature and humidity.
9 Apply a sufficient amount of epoxy resin compound L20/
960 to the surface area of the hole in the spar web. Remain-
ing small cavities within the area should be filled with
"HB20".
10 Apply a sufficient amount of epoxy resin compound L20/
960 to the outer surface area of the bushing.
11 Insert the bushing to the hole. Protruding lenght of bushing
out of the front and rear spar web should be equal. Slightly
rotate the bushing clockwise or counterclockwise while it
is inserted into the hole of the spar web. A continuous move-
ment is required to minimize entrapped air. Avoid partly re-
moving and reapplying, as this will cause air to become en-
trapped in the bonding gap.
12 Verify epoxy resin compound at entire bond line is continu-
ous and free of gaps.
13 Remove excessive resin compound with cloth damped with
isopropyl alcohol.
14 Apply mold-release agent to the related surfaces of the sta-
bilizer mounting brackets of the fuselage and related mount-
ing bolts.
15 Position the stabilizer to the fuselage mounting brackets by
related mounting bolts. The related mounting bolts should
be installed easily and hold the stabilizer in place for the
following cure process (without nuts).
16 Do not apply any pressure on the stabilizer prior to com-
plete cure cycle. Disturbing the stabilizer may create bond-
ing voids.
17 Apply curing procedure (specified time and temperature):
At elevated room temperature 25°C (77°F) for 10h followed
by 60°C (140°F) for at least 15h (refer to 51-70-02).
18 Reinstall the stabilizer. Refer to the applicable Chapter of
this Manual.