FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam 2025 - Free AMT Airframe Practice Questions and Study Guide

When performing a ring (coin tap) test on composite structures, a change in sound may indicate either damage or a transition to a different internal structure. This means that a change in sound can happen in both cases and cannot be used to determine one or the other exclusively. Option A and B are incorrect because they state that the change in sound only indicates one of the options. Option D is incorrect because a change in sound can indicate something is happening, but it may not necessarily be damage or a transition to a different internal structure. The correct answer captures the uncertainty and possibilities of the potential outcome when a change in sound is observed during the ring (coin tap) test on composite structures.