from the system speciic technical man-
Reinspect the damage removal area
Failure to properly cure adhesive in accor-
using NDI to ensure no skin delamina-
dance with the speciied cure cycle will result in
tions remain below the damage area.
reduced repair strength may not be detectable
by visual or nondestructive inspection. This
(g) Dry repair area as described in para-
may result in loss of structural integrity.
remove subsurface moisture.
(k) Cure the repair patch in accordance
NDI Patch Bond(s).
Reduced strength will result if the incorrect
mix ratio is used, if an excessive amount
Visually inspect adhesive squeeze
of air is introduced into the adhesive during
out at patch edge as described in
mixing, or if mixing is inadequate and may
result in loss of structural integrity.
Perform NDI of patch to skin and
Pressure must be applied to adhesive within
patch to iller bond areas to verify
the pot life of the resin. For ambient temper-
atures in excess of 90 °F, decrease this time
by 50%. An unsatisfactory repair will result
if the resin gels before adequate pressure is
applied and may result in loss of structural
DO NOT sand into laminate near patch edge
integrity. Select and prepare a heat blanket
when sanding adhesive squeeze out.
(if required) and all necessary vacuum bag
materials prior to mixing resin.
(m) If applicable, repair the outer lightning
Failure to observe the correct number of repair
the system speciic technical manual.
plies, the correct repair ply orientation, the
correct repair ply overlap and removal of all
pieces of vacuum bagging ilm will reduce the
strength of the repair and may result in the
Sand the area smooth with 180 grit
loss of structural integrity.
abrasive paper. Vacuum sanding
dust from repair area. Wipe with
(h) Clean the repair area in accordance
clean, dry wiping cloth to remove
replacement of the iller plies.
Apply inish system in accordance
Prepare the repair iller plies in accor-
speciic technical manual.
and place stacked, oriented patch on
the damaged site. Refer to the system
7-4. PENETRATION DAMAGE REPAIR. Penetration
speciic technical manual for the repair
damage repair involves damage to the entire thickness
iber, resin, number of plies, ply orienta-
of the laminate. These procedures can be used for
tion, ply size and overlap.
facesheet repair after the core has been repaired in
sandwich structure. The following repair procedures
involve wet lay-up patches integral to the structure.
Determine and apply cure hardware
Precured patches that are secondarily bonded or
and vacuum bagging materials in accor-
7-7. This paragraph identiies the facilities, equipment
Bagging. Refer to the system speciic
and materials required to perform a full thickness scarf
technical manual for the porous release
repair, full thickness scab repair, full thickness step
ilm, bleeder material and the number
repair, and full thickness bonded repair.
of bleeder plies.