Apply non-porous release ilm on
10 Seal the assembly in a vacuum bag.
the layup tool/part surface. Ensure
Apply full vacuum (≥20 inches of mer-
release ilm is 1 inch larger than the
cury) to the bag.
largest ply of the laminate. If a heat
blanket is used, release ilm should
extend one inch beyond edge of heat
blanket. Tape in place.
Failure to properly cure adhesive in accor-
dance with the speciied cure cycle will result in
Apply the debulked laminate to the
reduced repair strength may not be detectable
release ilm at the required location
by visual or nondestructive inspection. This
on the layup tool/part. Heat lamp(s)
may result in loss of structural integrity.
operating at 110 ±10 °F may be used
to assist in forming the laminate to the
11 Heat at 3-5 °F per minute to the tem-
perature and time from the system
Position at least two monitoring ther-
mocouples around the perimeter of
the laminate and tape in place. (Do
12 Hold at the temperature for the time
not place the thermocouples on the
from the system speciic technical
when coldest thermocouple reaches
Connect the thermocouples to a tem-
the minimum temperature tolerance.
perature measuring device/vacuum
Maintain a minimum of 20 inches of
mercury vacuum on the vacuum bag.
Place a layer of non-porous release
13 Cool to 140 °F while maintaining a
ilm over the laminate the same size
minimum of 20 inches of mercury. Do
as in step 1 above.
not exceed a cool down rate of 5 °F
14 Release vacuum and debag part.
heat blanket installation.
15 Perform NDI of laminate as described
Cover the layup with a 0.020 inch
ciic technical manual.
thick aluminum or copper sheet.
b. Method 2: Cocuring to Part. This method is
Cover with a heat blanket and tape in
used to simultaneously cure the laminate and the
may be cocured to the part needing repair, in which
Place a control thermocouple on top
case a layer of paste adhesive (as speciied in the
of the heat blanket over the center of
system speciic technical data) should be used. Cure
according to the cure cycle speciied in the system
Cover with 2 layers of breather cloth.