(1) Use a mixing ratio of from 50 parts
(11) Repaint repaired area following procedures
accelerator to 50 parts based by volume, to
100 parts accelerator to 100 parts base by
(a) Surface preparation. Metal to metal, wood to
metal and wood to wood contact surfaces, except those
to be welded or hot riveted or where paint will interfere
with the fit or function of a part in assembly, shall have
before assembly. Surfaces welded or hot riveted shall
Adhesives and solvents are highly
be cleaned and painted with the specified coating
flammable; perform work in well
ventilated area and away from fire.
(b) Exterior surfaces.
Exterior surfaces and
components shall be primed with one coat Epoxy Primer,
(2) Add the proper amount of adhesive base and
accelerator to a mixing cup (from repair kit) and mix
instructions)..Air dry 18 hours or 30 minutes at 1500 to
thoroughly using a mixing paddle from the repair kit. The
3000F. (66C. to 1490C.). Apply two finish coats of
pot life of the adhesive after mixing is 45 minutes.
b. Repairing Honeycomb Panel with Damage to One
manufacturer's instructions). Air dry 18 hours or 30
Surface Only. Repair damaged honeycomb panel as
minutes at 1500 to 3000F. (66C. to 1490C.). Color
match per Federal Standard 595 No. 34087.
(1) Trim the damaged area of the aluminum
(c) Quality control requirements.
facing using tin snips, circular saw or other suitable tool
A sufficient number of parts shall be
examined to assure acceptable quality of finishing on all
(2) Trim honeycomb core with a knife to the
parts. In general, the criteria listed in steps (2) and (3)
same size as the trimmed hole in the facing through the
shall be evaluated.
Properties or performance
characteristics other than those shown below may be
required by applicable drawings or other authoritative
In general, trimmed holes are not
restricted as to size, or shape;
2. The finish in all types shall show no visual
indication of alligatoring, blistering, chalking, checking,
circular, square and oval and
cracking, crawling, flaking, lifting, peeling, or sealing.
rectangular with round ends usually
The finish shall exhibit no sags, runs, skips, shading,
are more desirable as to appearance
dusting or dry overspray.
and ease of installation.
3. Adhesion shall be conducted on finished
(3) Clean the interior surface of the undamaged
parts at regular intervals. The tests shall be con- ducted
facing with emery cloth, and a clean lint free cloth
on a sufficient number of parts selected at random to
soaked with methyl-ethyl-ketone.
assure maintenance of a satisfactory level of adhesion
(4) Cut a section of honeycomb core material the
on all parts. In performing this test, it is suggested that a
same size as the trimmed hole using the honeycomb
plastic or wood stylus be used to scratch the paint films.
furnished with the repair kit.
A metal stylus may be used, but extreme care must be
(5) Fabricate plug patch plate which will overlap
exercised to avoid damaging the basic surface of the
hold opening by approximately three inches (8 cm) on all
Several parallel scratches shall be made
approximately one- sixteenth inch (0.1588 cm) apart.
(6) Drill rivet holes in the patch plate using a
Apply a one inch (2.54 cm) wide strip of tape, adhesive
side down over the scratches. Only newly manufactured
0.3353cm) diameter) and spaced as illustrated in figure
tape less than six months old shall be used. Press the
tape down with a firm pressure of the hand. Remove the
(7) Drill matching holes in panel using the patch
tape in one abrupt action and examine the tested area
plate as a template.
for any paint damage such as removal of paint at one of
(8) Apply a thin coat of adhesive to the cleaned
the layers of the finishing system or removal of the entire
interior facing (step 3, above), the edges of the
system from the surface. Test panels may be used.
4. Touch-up after test. Areas which have been
(9) Insert the honeycomb core into the trimmed
used for testing shall be refinished to equal as
area of the panel and press firmly in place. Fill area
above core with adhesive and place plug patch in
(10) Secure the patch plate in position using 1/8
inch (0.3175cm) domed head blind rivets (from repair