Turn & Bank Indicator, Electric, US Navy Aircraft 1970 A-20 indicating RPM for the rotor

indicating RPM for the rotor on the inner scale and rotor for the outer scale with a ratio of 9

to show the direction in which the airplane is pointing

The Bendix P-1 Autopilot system was used in several US Navy aircraft during the 1950's and saw service into the 1960's

25 inches diameter and ~ 2 inches deep

Turn & Bank Indicator, Electric, US Navy Aircraft 1970 A-20 indicating RPM for the rotorThe electrically operated, gyroscopic Turn & Bank Indicator, Bendix part number 13907 2K A2 4, was used in aircraft of the US Navy during the 1960 70's. This indicator has a service label from the NARF (Naval Aircraft Rework Facility) Alameda CA, stamped Jan 1970. The floating ball indicator no longer contains damping fluid, so the ball glides but not in fluid. The dial markings are clear and the glass and case are intact. See photos. Measures 3. 25