TM 5-1940-321-13&P
1. ESTABLISH CRAFT PRESSURE AT 180 mbar
2. DETERMINE CORRECT FABRIC, SOLVENT, AND GLUE (refer to paragraph F-2)
3. DETERMINE PATCH SIZE AND SHAPE (refer to paragraph F-6c)
4. DETERMINE BIAS OR STRAIGHT CUT PATCH (refer to paragraph F-2d)
5. TRACE PATCH SHAPE ON PATCHING FABRIC (refer to paragraph F-6)
6. CUT OUT PATCH WITH SCISSORS (refer to paragraph F-6c)
7. PLACE PATCH ON CRAFT AND TRACE OUTLINE (refer to paragraph F-6c)
8. SCUFF PATCH (EXCEPT STRONGAN) AND CRAFT WITHIN TRACING
(refer to paragraph F-3)
9. REMOVE ALL DUST
10. REFER TO GLUING SCHEDULE (table F-1)
d. Inner Patches. Inner patches must be applied to cuts in an air chamber. A normal outer
patch is then applied over the cut. The cut must be at least 4-inches long in order to slip the inner patch
into the air chamber. Follow this procedure:
(1)
First increase the size of the tear or hole to 4 inches so that the internal patch
can be slipped through the tear. To enlarge the size of the tear, always cut
away from any seams, D-ring pads, rubbing strakes, carrying handles, valves,
or other items.
(2)
Trace and cut a patch 2 to 4 inches larger than the tear in all directions.
(3)
Glue the inner patch in place after tracing the correct position on the outside of
the air chamber as a guide. This operation should be done with the craft
deflated and the patching area positioned flat on a bench. If possible, glue the
patch at its edge first, and then glue the lips of the tear one after the other as
you work from edge to edge.
( 4 ) Bone down hard in a direction that pushes the edges of the tear together as
much as possible.
F-20