I ordered the AHRS mounting kit from Van’s. This is designed for the Grand Rapids EFIS or the Garmin G900X, but I’m going to adapt it for the Dynon Skyview ADAHRS. I drilled out two rivets that tied the bottom skins to F-706 and F-707. These will now additionally tie the rib pictured here. I then ensured the ribs were parallel and match drilled the skin to the rib. I then used the digital level to ensure the mounting plate was level laterally and match drilled it to the F-729A rib and F-707 bulkhead. The mounting plate is tipped aft about 0.5º from the level of the longerons, but this is well within Dynon’s 1º limit. I can always shim the ADAHRS unit if necessary.
I’m still trying to decide how to mount the ADAHRS unit to the mounting plate. Dynon calls for nonferrous fasteners, but I haven’t been able to find stainless steel or brass nutplates. I can reach under the front edge of the mounting plate, but I’d kind of like to install the unit near the aft end of the plate in case I want to install another unit just in front of it.
Update: I ended up not installing the ADAHRS here because it is too close to the pitch servo and this can interfere with the magnetometer. I decided to use this to mount the ELT instead.
