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just finished an ovation conversion Garmin 275's, and 750 XI navigation, GFC 500 4 servo's system, did conversion in steeps with the last part being the auto pilot. Existing G275 units were originally installed when vacuum system was removed and HSI converted to G275 setup to feed the BK system as at that time, GfC 500 was not certified for our setup. upon certification, the 275 units were converted to Mod 1 by sending the units to Garmin and no charge for conversion. we were originally going to use BK auto pilot but repair cost for control head was way to excessive. Thank you BK. when converted to GFC 500 the system became alive, all kinds of new features became operational on the G275's, the beauty of Garmin integration with function display alt hold, alt call outs, heading changes via auto pilot and not having to touch the G275 to change settings ( except baro). these changes really remade the flying experience. between the 750 XI data ( had garmin480) that's available, its a new plane. in the long body we added the YAW servo, its operation was really a surprised on how'll well it made the plane fly, turn it on and off at different times during the 4.5 hr flight back home flight. it surprise us how much difference yaw made to the aircrafts flight. Ovation has air conditioning and oxygen, in order to work in the tail for installation, oxy and air systems were removed and reinstalled, other wise there not much room in the assembly to work in there, also because of AC, Garmin supplied a special bracket to hold servos.