Heading Selector, Zero Reader C-46 as used in aircraft of

as used in aircraft of the US Army Air Force and US Navy with tail wheel landing gear

and the Sperry part number is 673447

as does the Gyropilot release

Gyro Magnetic Compass

and EC-121 aircraft

Heading Selector, Zero Reader C-46 as used in aircraft ofThe Zero Reader Heading Selector, made by Sperry part number 672670 2, was a component of the Zero Reader Flight Computer. The Zero Reader was used in a number of Cold War era aircraft of the US Air Force, such as the F 89 Scorpion and F 94 Starfire jet fighters interceptors (see photos from F 89 flight manual showing the location of this instrument). According to the F 94 Starfire Flight Manual: The Zero Reader is an automatic flight instrument that