CESSNA AIRCRAFT
COMPANY
SINGLE ENGINE
STRUCTURAL REPA
IR MANUAL
GLASS FABRIC REPAIR
1. General
A. The following procedures are for parts which are constructed of epoxy prepreg glass fabric.
2. Tools and Mate
rials
NOTE: Equivalent substitutes may be used for the following:
NAME NUMBER MANUFACTURER USE
Fiberglass 181 weight Hexcel Repair composite
structures.
Polyethylene sheet
Commerciall
y available
Cover patche
s while
curing.
Adhesive EA9394 Loctite Aero
space
Bay Point, CA 94565
Adhesive res
in.
Adhesive EA9396 Loctite Aeros
pace
Adhesive resi
n.
Adhesive Epon 815 Loctite Aerospace Adhesive resin.
Methyl Propyl Ketone
Commercially available Cleaning solvent.
Sandpaper
Various grits
Commercially available
Abrading, smoothing.
Rubber sheet Commercially available Cover patches when
applying pressure.
3. Repair Of Glass Fabric Parts
A. The procedures listed below are for repairing of glass fabric parts. Refer to Figure 801 for an illustration
of a typical glass fabric repair.
(1) Cut and trim area immediately beyond damage. If parts were painted, remove paint and sand
clean an area at least 1-1/2 inches larger in diameter than the cut out section.
(2) Prepare necessary size and number of patches of glass fabric style No. 181.
WARNING: Always follow manufacturer's mixing instructions carefully to
ensure proper cure and prevent a spontaneous fire.
(3) Mix sufficient amount of resin in accordance with manufacturers instructions.
(4) Ensure that hands are free from oil, grease, and dirt, and apply an even coat of resin on sanded
area.
(5) Impregnate all the glass fabric patches by laying them on a polyethylene sheet and working the
resin through the glass fabric with a small brush.
(6) Place larger patch over cutout area, working out all air bubbles and wrinkles.
(7) If cutout is large enough to cause the patch to sag, place a suitable support behind repair area.
(8) Apply a second patch over the first patch, working out all wrinkles and air bubbles.
(9) After all patches have been applied, brush the area with an even coat of resin and allow to cure.
Curing time is 24 hours at 77°F.
(10) Smooth patched area with 600-grit sandpaper until desired finish is obtained.
(11) Repaint finished area with matching paint. Refer to the applicable Maintenance Manual, Chapter
20, Exterior Finish - Cleaning/Painting for painting procedures.
51-73-00 Page 801
© Cessna Aircraft Company Jun 1/2005
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