Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Corps, WWII B-52 the APS-22

the APS-22

The ammeter could be illuminated from the back

the "Polyplane Compensator" to correct for compass deviation

When used in conjunction with a suitable nondirectional (vertical) antenna

Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Corps, WWII B-52 the APS-22The Army Type D 7 Airspeed Indicator was used across a number of US Army Air Corps and Air Force aircraft during WWII, including heavy bombers B 17, B 24, B 29, medium bombers B 25 and B 26, as well as light bomber A 20, according to the Accessories Interchangeability Chart dated Feb 1945. It was also used in versions of US Army Air Force WWII fighters P 38, P 39, P 40, P 47, and P 51. This D 7 was made by Kollsman, part number 586K 028, and has a