TM 10-1670-287-23&P 0005 00  NOTE 0005 00-13  Change 1  Pull both lines evenly before looking at the ruler to ensure an  accurate measurement can be obtained. f.  Grasp canopy fabric near line 1A attaching loop. Moving to center of canopy, pull line 1A and the  control line on the right riser and compare lengths to ensure control line is 15-inches (+1-inch)  longer than line 1A.  g.  Grasp the base line of the right control line and compare the control line cascade lines to the  control line base line and insure they are even (+$^{1}$/$_{2}$-inch).  15 ± 1 IN. Control Line Reference Point For Comparing Lengths Line 1A  Control Line Cascade Line 