Flight Command Indicator ID-524/ARR-39A for SAGE System F-89 such as the US Army

such as the US Army Air Force P-51 Mustang and US Navy Fighter F4U Corsair

The black left lever engaged or disengaged the Sperry Gyropilot

Heading Index

A white airspeed index marker (seen at 500 knots in the photo) can be set by rotating the small knob at the lower right corner

Flight Command Indicator ID-524/ARR-39A for SAGE System F-89 such as the US ArmyThe ID 524 Flight Command Indicator was a panel mounted component of the AN ARR 39A Fire Control Data Link System, connecting to the ground breaking system known as SAGE Semi Automated Ground Environment. The AN ARR 39A system was installed in F 86D's Sabrejet Fighters along with an extensive electronics package in the late 1950's, becoming the F 86L Sabre Interceptor aircraft of the US Air Force. SAGE, an innovation developed by MIT, was the US's