T.O. 33B-1-15-755.4.5.4 DampingMethod.This method, illustrated in Figure 5-74, is effective for laminate, doubler, and skin-to-closure-member bonds whenaccess to the backside is available. If the inspector can dampen the multiple echoes from the far side of the bondedstructure with a wet finger, then the bond is good. Otherwise the sound is being reflected by an unbond and is notreaching the far surface, so it cannot be damped. Unbonds equal to or larger than the size of the search unit are easilydetected.Figure 5-74. Damping Method.
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