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This video shows the teardown and test of an Attitude Director Indicator model AD-300C manufactured by Sperry. 00:00 - Intro 00:56 - Teardown 02:25 - No gear train 02:50 - Test 05:53 - Attitude circuits modular circuit Notes: * This ADI uses a DC motor for the roll control and a torque motor for the roll * There is no gear train, the motors are directly linked to the gimbal for the roll and to the sphere for the pitch. This permits to save some weight and cost, the counterpart is the lack of stability when quick change of pitch or roll accurs. However this shouldn't be a problem with commercial aircraft. * The electronics use mainly potted modules Pinout: 26-27-28: roll synchro input 29-30-31: pitch synchro input 10: 28V attitude enable signal (from vertical gyro)