Trim the outside perimeter and window flange of the C-1 002A-L and -R Cabin Door Outer Shells. There are six "dimples· molded into the tool side of each cabin door outer shell; one near the lower door forward edge, one near the lower door aft edge, and one in the window flange near each of the four comers of the window. Drill a #40 hole through the cabin door outer shell at the center of each of the six dimples. These holes are "index holes" used to locate the door shells to each other and to the fuselage.
Draw two lines on the window flange of each cabin door outer shell, one line 3/4 inch offset from the window joggle and one line 1 1/4 inch offset from the window joggle.