of air is introduced into the adhesive during
mixing, or if mixing is inadequate and may
result in loss of structural integrity.
DO NOT use oil or oil based materials
Pressure must be applied to adhesive within
as NDI couplants on advanced composite
the pot life of the resin. For ambient temper-
components. Use only water or water based
atures in excess of 90 °F, decrease this time
materials. Disbonds may result and loss of
by 50%. An unsatisfactory repair will result
structural integrity may occur
if the resin gels before adequate pressure is
applied and may result in loss of structural
(b) Deine both the depth and extent of the
integrity. Select and prepare a heat blanket
damage using NDI according to para-
(if required) and all necessary vacuum bag
materials prior to mixing resin.
nical manual. Lay out the damage as
Failure to observe the correct number of repair
plies, the correct repair ply orientation, the
(c) Remove NDI couplant by wiping with
correct repair ply overlap and removal of all
clean, water moistened cloth.
pieces of vacuum bagging ilm will reduce the
strength of the repair and may result in the
loss of structural integrity.
Prepare the repair plies in accordance
DO NOT sand into laminate when removing
paint. When working on a carbon iber lami-
place stacked, oriented patch on the
nate, a black colored dust on the sandpaper
damaged site. Refer to the system spe-
indicates that sanding into the laminate has
ciic technical manual for the repair iber,
occurred and carbon iber is being removed.
resin, number of plies, ply orientation,
If this occurs, the sanding process should
ply size and overlap.
be stopped immediately. A loss of structural
integrity may occur if ibers are exposed or
Determine and apply cure hardware
and vacuum bagging materials in accor-
(d) Remove paint from skin in the repair
system speciic technical manual for the
area by sanding as described in para-
porous release ilm, bleeder material
and number of bleeder plies required.
(e) Remove damage as described in para-
Use the step length from the system
Failure to properly cure adhesive in accor-
speciic technical manual.
dance with the speciied cure cycle will result in
reduced repair strength may not be detectable
Dry repair area as described in para-
by visual or nondestructive inspection. This
may result in loss of structural integrity.
remove subsurface moisture.
(k) Cure the repair patch in accordance
(g) Clean the repair area in accordance
replacement of the plies.
NDI Patch Bond(s).
(h) Seal the backside of the damaged area
Visually inspect adhesive squeeze
system speciic technical manual.
out at patch edge as described in
Perform NDI of patch to skin and
Reduced strength will result if the incorrect
patch to iller bond areas to verify
mix ratio is used, if an excessive amount