jsmith wrote:

The "tap test", as used on fiberglass homebuilts, is used to detect
voids (air bubbles) in the epoxy/glass matrix. One usually uses a
Quarter to gently tap the surface. If there are any voids, the
difference in sound will be noticeable.

How long do you think it will take to do this on an Airbus rudder?

George Patterson
I prefer Heaven for climate but Hell for company.