Messing around with how to mount the pitot heat control box. I want it in the aileron bellcrank bay so I can access it, yet outboard ofthe bellcrank so none of the wires cause problems with controls. With the lightening holes and the formed flanges on the ribs, there is no good level spot to mount all four screws. The plan is to run two screws through a flat spot on the rib and then use a piece of angle stock to provide an additional line of support through the lightening hole. Want to keep the angle stock high enough that I still have access to the pitot through the lightening hole.

Version 1 - this worked pretty clean although I end up with a lot of unsecured wire in the pitot tube bay. I will tie a service loop, but it still feels like I should have an adel clamp somewhere to provide some strain relief to the heater box. Plus a service loop in the pitot bay will be difficult to access and re-tie if necessary.

Version 2 - Flipped the box over so the wires come through the lightening hole nearest the spar. Then I can actually put an adel clamp on the leg of the angle and secure the wires with the service loop in the aileron belcrank bay. This will be easy to access, and I think I can even get a wrench on the adel clamp.

9/20: Satisfied with the design I started fabricating the angle and carefully marked out where the screw holes would be. Assembled, clamped, drilled, disassembled, install nut plates, reassemble, temporary bolts, drill, disassemble, install nut plates…finally had something that looked about right. Installed the controller and used several nylon washers to provide enough stand-off to clear the rib hole flanges. I think it looks good. Exactly as I planned. As hard as I tried to accommodate, it will still be very difficult to replace if ever needed. Don't let me down Garmin.

9/21: finished this off by crimping the wires from the controller onto the appropriate wires in the main harness that I had already run.