Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Force, WWII F-80 BMEP is the acronym for

BMEP is the acronym for Brake Mean Effective Pressure

The 7-component Flux Gate Compass system was designed to provide accurate navigational guidance using the earth's magnetic forces by minimizing interference from the systems of the aircraft

and releases it when pulled out

although they typically attempted to dive as steep as 90deg

Airspeed Indicator, 500MPH, Army Type D-7, US Army Air Force, WWII F-80 BMEP is the acronym forThe 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 586BK 028, and has a