Extra 300/SC, Руководство по обслуживанию

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CHAPTER 51
PAGE 38
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 12. February 2019
For re-bonding of bushings the related stabilizer has to be
removed from the fuselage first. To prevent misalignment,
reinstallation is needed at the end of the re-bonding process
of the bushings.
1 Remove stabilizer from the fuselage. Refer to the applicable
Chapter of this Manual.
2 Carefully remove the loose bushing from the spar. If a tool
is needed, handle with care to prevent damage of adjacent
composite structure.
3 Visually check the hole in the spar web. In case an elongated
hole, a crushed plywood insert or a fuzzy or delaminated
surrounding fiber plies are identified, an oversized bushing
might be needed. Contact Extra Flugzeugproduktions- und
Vertriebs GmbH for advice and repair instructions.
4 Remove any residual resin debris existing on the outer bond-
ing surface of the bushing. Protect the inner surface of bush-
ing and sandblast or use 80-grit sandpaper to rough the outer
surface which will be bonded later on (no remaining shiny
areas are allowed). Existing grooves on the outer surface
(if any) must be free of residual resin.
5 Solvent clean the bushing thoroughly with isopropyl alco-
hol, carbon-tetrachloride or acetone.
W A R N I N G Solvents used for cleaning re-bond areas are flammable
liquids and should be used with proper ventilation and
safety equipment.
6 Take 120-grit sandpaper and sand the surface area of the
hole in the spar web where the bushing will be placed later
on smooth. Any bulk material (deposits) within the hole must
be removed.
N O T I C E Bonding area must be free of dirt, dust and grease.
7 Remove sanding dust with a pneumatic vacuum cleaner and
solvent clean the surface area of the hole in the spar web
with isopropyl alcohol, carbon-tetrachloride or acetone in
case dirt or grease was introduced during the preparation.
8 Prepare a sufficient amount of epoxy resin compound L20/
960. The weight ratio is: 100 parts L20 with 34 parts 960