Directional Gyro / Turn Indicator, Jack & Heintz AN-5735 Northrop Tire diameter

Tire diameter

rotating the pointer clockwise from the 6 o'clock position

called the North-seeking end

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

this compass was used in aircraft Ar79

Directional Gyro / Turn Indicator, Jack & Heintz AN-5735 Northrop Tire diameterHere is a WWII era pneumatic Directional Gyro Turn Indicator made by Jack & Heintz. According to the Maintenance Interchangeability Cross Reference Charts of the Air Forces US Army, the AN 5735 Directional Gyro was used across nearly all aircraft of the US Army Air Force and US Navy during WWII. The knob rotates the course setting indicator, and once pulled out, uncages the compass card which would then rotate right or left. The knob and card are a