Moved on to the F-706 bulkhead today, including a rib and a channel that will eventually hold the elevator bellcrank. The rib annd channel are match-drilled to pieces of 6061-T6 angle that are fabricated from stock. Here’s the F-729 bellcrank rib match-drlled to its corresponding angle…

For some unknown reason, I didn’t take any pictures of the F-728 – but it looks pretty much the same. One minor screwup…both of these assemblies have a 1/4″ hole for the bellcrank attach bolt. When match-drilling that hole in the F-729 angle and channel, I managed to let the drill bit drift a little and wound up egging out the hole – not something you really want to happen when dealing with a primary flight control system. Fortunately, I have a lot of spare angle stock, and Vans delivered a nice new F-729A to my door. Problem solved!

I have three weeks of work travel and then a family trip to France, so no more updates for a month or so…