Radio Magnetic Indicator ID-250/ARN Consolidated Keys to each of 3

Keys to each of 3 card decks

The knob rotates the single line arrow

and transports C-46 Commando

The caging knob at the lower right corner would either capture the gyro in a fixed position i

including the Douglas DC-7

Radio Magnetic Indicator ID-250/ARN Consolidated Keys to each of 3This Cold War Vietnam War era Radio Magnetic Indicator (RMI) ID 250 ARN was made by Bendix for use in aircraft of the US military in the 1950 60's and used in the AN ARN 14 Radio Navigational System (see illustrations). This indicator was commonly used in US Army helicopters such as the UH 1 Bell Huey and the AH 1 Cobra, not to mention the B 52 Stratofortress Bomber (see image of flight panel) and the F 100 Super Sabre jet fighter (see image from