Morgans wrote:

there HAS to be a better way than a tap test.

Actually, no. Like it or not, but there are situations where the human
eye, ear and feel is still the most accurate method, if carefully done
by a skilled person, of course. (This is just a generic remark. I am no
specialist in composites at all and haven't the slightest clue what
problem airbus might or might not have.)

Stefan