Tears etc.) If a repair patch loosens at the edges, do not
the parts are peeled apart. Examine the separated parts
for damage and repair damage by patching or
remove the complete patch for repair; cut off loose or
replacement, before recementing parts.
fringed ends and cover the old patch with a new larger
(2) Thoroughly clean surfaces to be cemented as
patch as follows:
described in paragraph a. above.
(3) Apply adhesive as described in paragraph
a. above. Activate about 10 to 12 inches (25 to 30.5
If old patch is off or is removed, install
cm) of the adhesive surfaces at a time as described in
oversize patch to replace old patch.
paragraph a. above. Allow the activating solvent to
(1) Repair a one inch (2.54 cm) patch with a three
evaporate slightly (not wet) and press together about six
inch (8 cm) patch, a two (5.08 cm) inch patch with six
to eight inches (15.24 to 20.32 cm) of the seam to
inch (15 cm) patch and all larger patches with a patch
ensure that no more seam will be joined at a time than
extending three inches (8 cm) beyond the old area.
has been activated.
(2) Clean the area to be cemented and the
(4) Join seams gradually. Press the surfaces
applicable side of the patch as described in paragraph a.
together by moving the finger or thumb along the seam.
Squeeze all air bubbles from between the adhesive
(3) Apply adhesive and activate adhesive as
described in paragraph a. above.
(5) Roll each six to eight inch (15 to 20 cm) section
(4) Install new patch and use roller with pressure to
immediately with the roller provided in the repair kit.
When the seam in completely joined, reroll the length of
the seam with roller.
e. Replacing Repair Patches (Patches Over Holes,
Section XII. MAINTENANCE OF RIVETS AND INSERTS
Proper length of rivet to be used shall be
This section provides organizational maintenance
determined by measuring the actual
personnel with general repair and replacement
thickness of material through which the
instructions applicable to rivets and inserts used in the
rivet will go and then selecting proper
diameter is important as the blind rivets
4-47. Blind Type Rivet Replacement
installed in oversize holes will not retain
a. Storage and Handling. Rivets must be stored in
the stem satisfactorily. Undersize holes
the original labeled packages. The packages shall be
will not permit proper pull-in of stems
kept closed when not in use to prevent dirt, grit, metal
chips, etc, from coming in contact with the lubricated
(1) Hold parts to be riveted tightly together with clips,
clamps or other satisfactory method.
b. Removal. Rivets which are damaged or used for
(2) Insert proper rivet in hole and apply with gun
securing a replaceable part shall be removed as follows:
(supplied with repair kit) by inserting stem head of rivet in
(1) Drill through the center of the rivet. Use a drill bit
bottom slot in gun pulling head (nose piece).
with the same diameter as the original rivet hole. The drill
must be held perpendicular to the surface to prevent
enlargement or damage to the existing hole. Drill through
just deep enough to sever the rivet head from the shank.
Wet all rivets with sealant (EC 776, 3M
(2) Remove any remaining rivet with a pin punch and
Co., or equivalent) before installation.
remove any burrs from rivet hole.
( 3) Hold gun at right angle to work. Push gun against
c. Rivet Replacement. Select a rivet of the proper
work with just enough force to firmly seat rivet and to aid
in avoiding sheet or other part separation.
diameter and length and install as follows:
(4) Pull rivet until stem breaks.
(5) Installed blind rivets shall be checked per
paragraph d. below before proceeding.