Brief Description: Drill Transponder antenna / trim glareshield
Today's work is split over two posts to allow enough images; this post's time duration covers both posts.
1. First up I removed the upper panel cover / glareshield. Drilled the location for the main transponder antenna and installed.
2. Before removing the glareshield, I made a mark for location of the firewall. After removing the panel, I made a mark 1-7/8" from the firewall, which is the same distance as the fuselage side skins. Pic 2 below shows the result of the trim - the upper panel now is at the same distance as the side panels.