Measured GAD27 (already connected to IP harness by Stein Air, so didn't remove) to make a template, then drilled four #10 holes for 10-32 pan heads on LH subpanel. Installed 4 nutplates. Positioned GPS20A and drilled 4 #10 holes. Installing top 2 nutplates for GAD27 was very difficult, so I changed to blind rivets.
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| Nutplates installed for GAD27, GPS20A positioned (holes drilled). |