Technical data

13773-001
51-20
Page 8 30 Nov 2000
Note: Always manufacture backing plate on a surface with shape similar to the dam-
aged area. Backing plate shall be approximately one inch larger (0.5" overlap on
each side) than diameter of puncture if the backing plate is being bonded to back-
side of puncture.
(a) Acquire necessary tools, equipment, and supplies.
(b) Cover the selected area with release film and work out all wrinkles.
Note: The release film will protect the underlying surface and will separate easily
after the part is fully cured.
(c) Cut glass-fiber cloth for backing plate. Number of plies required is dependent on the size
of the hole. Fiber orientation is not important. However, finished backing plate may warp if
laminate is unbalanced.
Note: Minor warping is caused from improper fiber orientation. Minor warping is
not a concern when manufacturing backing plates. Because backing plates
are generally thin and flexible, they can be forced to the correct contour
when necessary.
(d) Cut two pieces of peel ply one-inch larger than the desired backing plate dimension.
(e) Mix resin (Shell Epon 862/heloxy 68 & Teta 3234, Type 2 Class 1) per manufactures
instructions.
(f) Laminate plies on selected area and perform initial cure per standard procedure to create
backing plate. (Refer to 51-20)
Description P/N or Spec. Supplier Purpose
Non-structural Resin Repair
System (Type 2, Class 1)
Shell Epon
862/heloxy 68
& Teta 3234
Shell Oil Used only for man-
ufacturing backing
plates and for
repairing Non-
structural areas
Glass Fiber Cloth 7781-F16 Hexcel Manufacture back-
ing plates and lami-
nate repair
Devcon Epoxy 5 Minute Devcon Bond backing plate
to damaged inner
laminate
Clecos or Small Screws N/A Any Source Secure backing
plate into position