MOONEY AVIATION COMPANY, INC.
M20TN SERVICE & MAINTENANCE MANUAL
Date
2006
Rev Date
Page 19
51--15--00 -- FIBERGLASS LAMINATES, REPAIR
PROCEDURES
Despite the fact that fiberglass laminates are designed
to withstand considerable abuse, occasional repairs
will be necessary. It is difficult to cover all the various re-
pair techniques due to such limiting factors as accessi-
bility and the extent of damage. The following outlines
those steps which are used to make repairs of the more
common type damage to a fiberglass laminate.
1. Materials used for repairs shall be as specified and
compatible with the basic resin used in the fiberglass
laminate (Figure 51--25).
Resin
Aerospace Adhesive EA934
Part A
Catalyst
Aerospace Adhesive EA934
Part B
Hysol Division
The Dexter Corporation
Alternates
Resin
Epoxical #606 Patching Adhesive
Resin
Catalyst
Epoxical #606 Patching Adhesive
Hardener
United States Gypsum
OR
Resin
Ren Epoxy CG 1304
Catalyst
Ren Hardener CG 1304
Ren Plastics Co.
Lansing, Michigan
REPAIR MATERIALS
FIGURE 51--25
Fire retardation -- Antimony Trioxide for fire retardation
(5% minimum; 10% maximum by Weight of Resin Con-
tent) must be added to the base resin (cowling and air
intake duct assemblies).
The manufacturer’s bulletins shall be followed for all
mixing ratios and preparation prior to application.
2. General.
A. The configuration of repairs is shown for flat sur-
face areas; for simplicity; however, the same tech-
niques can be used for contoured surfaces. Contoured
repairs will require additional considerations and the
proper shaping of the backup plates used for clamping
the laminates together during the curing cycle.
B. The degree of laminate chamfer and size will
vary based on accessibility, shape of part and the ex-
tent of damage.
51--15--01 -- CRACKS, IN SURFACE AREAS
1. Stop drills all cracks per standard aircraft proce-
dure.
2. Remove any loose particles and frayed fiberglass
strands from the cracked portion.
3. Prepare surface for repair as shown in Figure
51--26, Figure 51--27, and Figure 51--28.
4. Prior to continuing the repair, all surfaces in the
area of the repair must be cleaned of all contaminates
by wiping the area with a clean cloth saturated with
Methyl--Ethyl--Ketone.
-- CAUTION --
Methyl Ethyl Ketone (M.E.K.) is a flammable liq-
uid and should be used with proper ventilation
and the prescribed safety equipment.
-- CAUTION --
Fiberglass components are attacked and deterio-
rated by the following products: Ketone, aliphatic
esters, chlorinated hydrocarbons, and slightly
softened by aromatic hydrocarbons.
51--15--02 -- NON--STRUCTURAL REPAIR
1. Apply masking tape over crack on finished surface
side (Figure 51--26).
2. Apply wet coat of catalyzed epoxy resin to cham-
fered surface.
3. Apply one layer of #181 fiberglass cloth saturated
with catalyzed epoxy resin (A).
4. Add additional plies of #181 fiberglass cloth, satu-
rated with epoxy resin (B) through (C) or as required to
attain original laminate thickness.
5. Apply one additional ply of #181 cloth (D) bridging
the total repaired area and bond in place.
51--15--03 -- COMMON STRUCTURAL LAMINATE
REPAIR (METAL INSERT)
1. Cut away laminate per Figure 51--27, roughen re-
pair area with 240 sandpaper, clean repair area with
M.E.K. -- apply a wet coat of catalyzed epoxy resin to
surfaces. Then IMMEDIATELY proceed with steps 2
thru 5.
2. Install chemically cleaned .025 T--3 aluminum
straps, perforated with #40 holes approximately .35 on
center all directions.
3. Apply wet coat of epoxy resin to aluminum straps
and apply one or more layers of resin saturated #181
fiberglass cloth to equal the thickness of the original
laminate.
4. Lay wax paper over both sides of the repaired area
while still wet. This prevents adhesion to the pressure
clamp application (paragraph 5).
5. Place rigid aluminum plates on both sides of repair
area and clamp into place with “C” clamps. Permit lami-
nated repair to cure.
6. After fiberglass repair has cured, remove clamps
and install #3 AN426A rivets. Flush heads to be on fin-
ished surface side. Number of rivets and spacing will be
determined by size of repair.
7. Apply one additional overlapping layer of #181 fi-
berglass cloth on non--finished surface and bond in
51--15--00
Summary of Contents for M20TN
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