Noncritical repairs are satisfactory if they have 60 percent
of the original strength restored. (Page 62)
Using the proper size drill will ensure that the hole stops
the crack from getting larger. (Page 62)
Chamfering or bending the edge of a patch helps to keep
moisture from getting under the patch to cause corrosion.
One gage thicker than the skin.
Original strength is the most important repair principle.
One gage thicker than the skin helps to do this. (Page 63)
If the old sheet is too damaged to be used as a template,
then back drilling may be the only way left to drill the
holes to align with the original holes. (Page 67)
Sealing compounds are pliable rubber seals. Rubber seals are
used as gaskets whereas sealing compounds are used as
No more than 120.
If a sealant is cured at too high a temperature, it can
develop air bubbles or cure unevenly. (Page 88)