Attitude indicator built by Lear Siegler, Inc., for the McDonnell Douglas F-4 Phantom II fighter jet, measuring 5˝ x 5.25˝ x 7˝, with a Lear Siegler Instrument Division label on the body: "Indicator Attitude, ARU-11/A, PN 139000-01-03, Serial No. 0004064, Model 4060P, Spec. MIL-I-276198." The indicator is designed to indicate the relationship of the aircraft with respect to the horizon, showing whether the aircraft is climbing, diving, or banking left or right, and to what degree; it also has a small floating-ball turn/bank indicator at the bottom of the instrument, similar to a standard 'bubble level.' In fine condition.
