d. If applicable, restencil information data or identification marks as prescribed in WP 0017 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 darns and three 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 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 or more patches verses one large patch or
one 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.
Canopy damage chart. A canopy damage chart is provided for local reproduction. The canopy damage
chart is used to record canopy damage and repair action.
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