Cessna 510 Mustang Structural Repair Manual page 92

Kydex) surfaces.
(2) Type II - Polyester resin base, which contains or is combined with powdered aluminum or aluminum flakes, catalyzed
with benzoyl peroxide curing agent. A two component material which cures to hardness in between 15 and 20
minutes at 75°F, +5 or -5°F (24°C, +3 or -3°C). Used on exterior surfaces which are not exposed to temperatures
above 250°F (120°C). Used only on metal surfaces.
(3) Type III Epoxy resin base with an amine curing agent. A two component material which cures to hardness in between
12 and 16 hours at 75°F, +5 or -5°F (24°C, +3 or -3°C). It may be force-cured with a hot air blow gun. Used on
exterior surfaces not exposed to temperatures above 350°F (177°C). Can be applied to metal and to fiberglass or
Kevlar composite surfaces.
(4) Type IV - Thixotropic epoxy resin base, containing powdered aluminum, with an amine curing agent; both formulated
for high temperature use. A two component material which cures to hardness in between 12 and 16 hours at 75°F, +5
or -5°F (24°C, +3 or -3°C), or it may be force-cured with a hot air blow gun. Used on exterior surfaces which have a
maximum continuous service temperature of 400°F (205°C) or a maximum intermittent service temperature of 550°F
(288°C). Restricted to use on metal surfaces only.
B. Limitations of Aerodynamic Fairing Compounds.
(1) Type II fairing compounds must be applied only to exterior surfaces that are not subject to flexing, bending or other
modes of deformation. They must not be used on or over surfaces of radomes or radio altimeters, due to interference
effects from the metal powder or metal flake filler contained in the material.
(2) Whenever and wherever force curing is practical, Type III fairing compounds must be the preferred materials for
smoothing exterior surfaces, but not in areas which are exposed to high temperatures. Where force curing is not
practical, it is acceptable to use Type I fairing compounds on all exterior surfaces but not those that are exposed to
high service temperatures.
(3) All Type I and Type III fairing compounds should have a water insoluble dye in the curing agent (creme hardener or
catalyst) which changes color to an eye-catching hue after being mixed with the resin base. The degree of color
change must indicate to what extent the two parts have been mixed.
(4) Different types of fairing compounds must not be mixed together as one compound before application, nor must they
be used in combination with each other in a sequential manner (a layer of catalyzed Type I fairing compound on top of
a layer of catalyzed Type III fairing compound, for instance).
(5) Aerodynamic fairing compounds must not be applied over the heads of any screws, bolts, or fasteners which have to
be removed at regular intervals for routine maintenance.
4. Surface Preparation
A. Aluminum.
(1) Aluminum surfaces which are to receive aerodynamic fairing compound must be scuff sanded, using sanding discs
and power sanders or must be sanded by hand with 80 grit sandpaper. Care must be exercised not to sand through
the clad layer. Following sanding, the aluminum must be solvent wiped, using clean methyl n-propyl ketone and
cheesecloth. The metal must then be brush chemical filmed. Apply fuel and corrosion resistant primer to chemical film
treated areas prior to application of aerodynamic fairing compound. Refer to Protective Treatment of Metal.
B. Composite Surfaces.
(1) Fiberglass and/or Kevlar composite surfaces must be scuff sanded using sanding discs and power sanders or be
sanded by hand with 150 grit sandpaper. Care must be exercised to make sure not to sand into the glass cloth or
fabric. All sanded areas must then be solvent wiped, using clean methyl n-propyl ketone and cheesecloth.
(a) Water break test to make sure that all mould release compound has been removed.
(2) Graphite composite surfaces may not be repaired without specific evaluation of the individual assembly. Contact
Cessna Customer Services Department.
C. Bonded Assemblies.
(1) Surfaces which have bonding primer on them and which are to receive aerodynamic fairing compound must have the
bonding primer scuff sanded, then be solvent wiped. Exposed aluminum surfaces must be brush chemical filmed as
specified for aluminum surfaces by paragraph A.(1) above.
D. All surfaces which are to receive aerodynamic fairing compound must be free of dust, grease, shop oils, cutting fluids,
identification markings, metal filings and other foreign particles and moisture prior to the application of the fairing
compound regardless of type.
Copyright © Textron Aviation Inc.
Retain printed data for historical reference only. For future maintenance, use only current data.
FOR TRAINING PURPOSES ONLY
ISSUE 02 , JAN 2018
Model 510 Structural Repair Manual (Rev 2)
51-70-01-0 (Original Issue)
Print Date: Wed Mar 21 05:12:20 CDT 2018
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