TM 10-1670-287-23&P
0039 00
UNIT MAINTENANCE
MC-4 RAM AIR FREE-FALL PERSONNEL PARACHUTE SYSTEM
SNAP FASTENERS
0039 00-1
THIS TASK COVERS:
Repair
Replace
INITIAL SETUP:
Tools
Anvil, Chuck Fastener (Item 1, WP 0063 00)
Chuck (Items 6/7, WP 0063 00)
Die (Items 8/9, WP 0063 00)
Holder, Die Fastener (Item 20, WP 0063 00)
Key, Socket Head Set (Item 22, WP 0063 00)
Knife, Hot Metal (Item 24, WP 0063 00)
Mallet, Rawhide (Item 27, WP 0063 00)
Pliers, Large, Diagonal Cut (Item 32, WP 0063 00)
Sewing Machine, Medium-Duty (Table 1, WP 0015 00)
Shears (Item 39, WP 0063 00)
Materials/Parts
Fastener, Snap, Button (Item 18, WP 0076 00)
Fastener, Snap, Eyelet (Item 19, WP 0076 00)
Fastener, Snap, Socket (Item 20, WP 0076 00)
Fastener, Snap, Stud (Item 21, WP 0076 00)
Thread, Nylon, Size E (Item 43/44, WP 0076 00)
Webbing, Nylon, Type II (Item 48, WP 0076 00)
Equipment Condition
Lay out on packing table or other
suitable area.
Personnel Required
92R (10) Parachute Rigger
REPAIR
Snap fastener repair is limited to reseating which will be accomplished using the applicable procedures
and tools prescribed in the replace procedures detailed below.
REPLACE
A snap fastener that is defective or cannot be reseated will be replaced with a serviceable item from
stock. However, if only one part of a fastener is defective, such as the socket or stud, just that particular
portion of the fastener assembly requires replacement. Replace a damaged snap fastener as follows:
1. Original snap fastener removal.
a. Cut crimped edge of applicable snap fastener assembly part at three or four points with diagonal
cutters.
b. Using a suitable type tool, pry back fastener crimped edges and remove applicable defective
fastener parts.
NOTE
Reinforcement is not authorized on the inner top main container
closing flap or in the area of the left riser static line snap fastener.
2. Reinforcement of original snap fastener area. If fabric area around original snap fastener is damaged,
repair area by applying a reinforcement patch to the outside of the material. Use a 1-inch square of
seared type II nylon webbing.
