Figure 9-39. Gouge Repair
Sand smooth all repaired areas
after curing using No. 320-400 grit abrasive cloth.
Repair and inspection of threaded inserts
in backing. Repair and inspection procedures are as
Inspect panel for loose inserts
or damaged threads.
Inserts in a composite fiberglass-
plastic type of backing have a
tendency to work loose. It is
important to replace any missing
insert as the heavy armor panels are
severely strained during a shock
loading, such as a hard landing.
Repair damaged Insert threads,
where possible, using the proper sized tap to chase
Where an insert is loose, drill
two small holes, 180 degrees apart, in the fiberglass
backing next to the insert Angle the holes toward the
bottom of the insert.
Inject bonding compound, Metalset
A4 (FSCM 90414)with a syringe into one hole. Fill
around insert until compound discharges from second
Metalset A4 resin cement is furnished
as two compounds, Part A (resin) and
Part B (hardener). Thoroughly mix
Part A and Part B in a 1 to 1 ratio by
weight or volume. Allow bonding
compound at 150°F (660C) for two
hours. Excess Metalset A4 must be
removed before it hardens. Remove
excess resin with Toluol, TT-T-548.
Replace rubber edge molding
after abrading the inside surface using a fine wire wheel
(0.004 inch diameter wire) or abrasive cloth.