Chapter 12 - Step 1

This step simply has you drill a hole in the doubler near F-28 and make a rounded head bolt to go in it.

Alignment Pins June 15, 2002. Here are the alignment pins made from AN3 bolts. The heads have been cut off and the end rounded. #10 holes are drilled into the center of the longeron doublers. The pins are parallel with the longitudinal axis of the fuselage as viewed from above and the side. I hope that is right.