TM 10-1670-287-23&P  0053 00  DIRECT SUPPORT MAINTENANCE  MC-4 RAM AIR FREE-FALL PERSONNEL PARACHUTE SYSTEM  SUSPENSION LINES (LINES 4A/B AND 5 A/B ONLY)  THIS TASK COVERS:  x Replace  INITIAL SETUP:  Tools Materials/Parts  Personnel Required  Equipment Condition  Follow-Up Procedure  REPLACE NOTE Sewing Machine, Bartack (Table 1, WP 0050 00)  Shears (Item 39, WP 0063 00)  Tape Measure (Item 42, WP 0063 00)  Cord, Dacron, 600-Pound, Type I (Item 12, WP 0076 00)  Thread, Nylon, Size E (Item 43/44, WP 0076 00) 92R (10) Parachute Rigger  Lay out on packing table or other  suitable area.  Continuity check and canopy trim  check (WPs 0005 00 and 0006 00). This procedure applies only to lines 4 A/B and 5 A/B which in each  case are one continuous line, running from the forward center cell  (A lines) of the canopy to the inboard side of the front connector  links, then back to the forward center cell (B lines) of the canopy.  1.  Find the approximate mid-point of replacement line. Position midpoint at inboard (barrel side) of  connector link. Secure line to connector link with bartack stitch. Bartack begins $^{3}$/$_{4}$ ± $^{1}$/$_{8}$-inch from end  of loop and is $^{5}$/$_{8}$-inch long by $^{1}$/$_{8}$-inch wide.  Bartack $^{5}$/$_{8}$-IN. $^{3}$/$_{4}$ (+$^{1}$/$_{8}$)-IN. 0053 00-1 