Wheel and Flap Position Indicator, Type A-3 HUP The K-13 Compensating Gunsight

The K-13 Compensating Gunsight

Included is a clear cover

with BU AERO US NAVY on its data label

The dial measures 3

Wheel and Flap Position Indicator, Type A-3 HUP The K-13 Compensating GunsightThis is a WWII era Wheel and Flap Position Indicator, Type A 3, as used in aircraft of the US Army Air Force and US Navy with tail wheel landing gear. According to the Maintenance and Interchangeability Chart dated Feb 1945, the A 3 indicator was used in early versions of fighter P 47 Thunderbolt (see image of the P 47 instrument panel from its flight manual dated 1943) and transport C 46 Commando. It was also used in the fighter P 40F Warhawk