Similarly low-tech is the "tap test".
They can look quite realistic, though they also fail the tap test.
American Airlines will use a variety of inspection techniques, including a tap test, in which technicians hit the part and listen for sounds that would indicate a void, said Thomas Haueter, the board's deputy chief of aviation safety.
To present an objective method to evaluate gait improvements after a tap test in idiopathic normal pressure hydrocephalus (INPH).
However, good aerospace practice dictates that the repair should be inspected visually and by tap test during phased inspections.
Traditional non-destructive techniques (NDT) utilize a variety of methods, ranging from a simple tap test to more complicated approaches, like ultrasonic or thermography techniques.
An acoustic tap test was performed at the whole covered CFRP surface to identify air pockets and delaminated areas by sound.
It is shown that the intelligent tap test is a useful and practical diagnostic tool for detecting localized damage in structures.
During each data acquisition, the patient carried out the tests provided for the EMG protocol as detailed by the Laboratory of Functional Anatomy of the Stomatognathic System (Laboratorio di Anatomia Funzionale dell'Apparato Stomatognatico): cotton, clench, clench-rest and tap tests.
