TM 5-1940-321-13&P
Figure 6-1. Brushing Soap and Water Solutions on Craft.
( 8 ) After all valves are wet with soap solution, return to the first valve and brush it
again slowly.
( 9 ) Air leaks will cause bubbles to form. Brushing on the soap solution will also
create bubbles. These bubbles will become smaller and disappear. Look for
bubbles that grow in size. Bubbles that grow in size indicate air leaks. Small
leaks will take a longer time for form bubbles. Be patient and observe closely.
Brush suspected areas again. If a small pinhole sized puncture is found, do not
assume that it is the only leak; others may exist.
( 10 ) When a leak is located, brush the area again and carefully observe the exact
location of the leak. Use the silver pen to mark the leak locations on the fabric.
NOTE:
A valve can leak from several points. Identify and note the exact location, such
as valve cap, between valve base and fabric, or at the valve insert. See figure
6-6
