Brief Description: Installed SP-4 and RDAC X ground buss
If over 2 hours seems like a long time to drill four holes, well it is. When most of the time is spent figuring where to place the AHRS unit, then it makes more sense. The goal is to have this unit, which sends attitude information to the EFIS, as close to the center of rotation in the airplane as physically possible. It needs to be as close to perfectly horizontal and aligned with the longitudinal axis as it can be as well. Because of brake lines and my main power cable, I had to offset the unit by approximately 6 inches to the left of center. I feel fairly confident that this amount of offset will not have a noticable impact on the readings. I mounted it on a piece of thick rubber for some degree of insulation from vibration. I also replaced the RDAC X ground buss with the insulated version that I fabricated last night.
Looking down into the center tunnel to the SP-4 AHRS in place