Airspeed Indicator, 500 MPH Type D-6 PN 586S-025 A-35 Vengeance or internal gyro-caging mechanism

or internal gyro-caging mechanism

This is an original WWII-era manual of Instrument Calibration for Bombardiers

This Airspeed Indicator is a WWII-era US Army Air Force Type D-7

This 79-page manual describes the gun and its subassemblies

Airspeed Indicator, 500 MPH Type D-6 PN 586S-025 A-35 Vengeance or internal gyro-caging mechanismThis Airspeed Indicator is a WWII era US Army Air Force Type D 6, Kollsman PN 586S 025, as used across a number of US Army Air Corps and Air Force aircraft during WWII, including heavy bombers B 17 and B 24, medium bombers B 25 and B 26, as well as light bomber A 20, according to the Maintenance Interchangeability Chart dated Dec 1943. It was also used in versions of US Army Air Force WWII fighters P 38, P 39, P 40, P 47, and P 51. The red pointer is