c. The cited stitching procedure also applies to an L-shaped cut or tear.
d. If applicable, restencil information data or identification marks as prescribed in WP 0052 00.
4. Patching Procedures. Patching is a procedure used to repair holes that cannot be darned.
a. Patching limitations for the parachute canopy and container. The following is a list of patching
limitations for the MC-4 parachute canopy and container.
(1) A patch will not be applied to a damaged area that has been previously patched.
(2) There will be no more than two (2) darns and three (3) patches per section, rib, or stabilizer,
not to exceed 50 percent. A canopy section is defined as an area between loaded ribs (on
the left and right side rigger view) and from seam to seam from nose to tail.
(3) A rib and a stabilizer are each considered as one (1) section. A finished basic patch shall not
be closer than one-inch from a sewn seam. However, determination should be made as to
the lowest economical method to be used (i.e., two (2) or more patches verses one (1) large
patch or one (1) large patch verses a section replacement).
Patches must be cut with their edges parallel to the warp and weft of
the fabric and are to be applied with the warp and weft threads
parallel to those of the material under repair.
B L-SHAPED CUT OR TEAR STITCHING