Riveted both sets of F-631C&D angles to make the cabin frame attach brackets. Located, drilled, reamed, and deburred the attach holes for the right bracket through the bracket, F-757 gusset F-705F channel, and F-705G angle. After locating and clamping the bracket, I started by match drilling the existing #30 holes through the rest of the assembly, then upsizing with #19 and 15/64 drills, followed by an 0.249 reamer.
Later in the day I precisely located and clamped the left bracket assembly, using the right one as a reference (photo 2). It was late so I decided to wait a day and remeasure before committing drill to metal.
Rivets Today: 4 Rivets Total: 12086
Right cabin frame bracket located and ready to drill to fuselage.
Making sure both brackets are at the same fore/aft station.
