3-56 INSPECTIONS / GENERAL INSPECTION TASKS
ICON A5 / MAINTENANCE MANUAL CHANGE C2
FIGURE 3-4
MANUAL TAP TEST PROCEDURE.
1. The inspection area should be relatively free from noise and distraction. A representative sample
of the part/structure being inspected must be present and used as a reference.
2. Tapping on the part/structure must be done lightly to avoid damage during the inspection
process. Recommended tapping stroke is approximately 1.0 inches to 1.5 inches.
3. Tap the reference sample lightly approximately 3-5 times per second in both the good and iden-
tified potential defect area to note the audible difference.
4. Systematically inspect the part/structure tapping approximately every 0.5-1.0 inch and returning
to the reference sample periodically to note any audible difference.
VERIFICATION METHOD:
If a defect is found, tap outward from the center of the defect until a change in sound is detected. Mark
the area of change and repeat until the entire defect area is identified. Contact ICON for repair instruc-
tions.
RELATED INFORMATION:
"Condition and 100-Hour Inspection—Wings" on page 3-11
"Condition and 100-Hour Inspection—Forward Fuselage and Hull" on page 3-16
"Inspect Empennage Skin" on page 12-4
"Wing Skins Delaminate/Voids" on page 17-4
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