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 EC-121 aircraft

and the Sperry part number is 673447

See photo of the location of the instruments on the Flight Engineers lower instrument panel from the C-121 flight manual dated 1958

such as heavy bombers B-17 and B-24

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