Photograph of two men watching as William P. Lear jumps on a piece of windshield material to demonstrate its durability, circa 1960s.Inscription on verso: "WPL - 6LT01 / Lear Avia Archive / WPL jumping on Lear Jet windshield material to show…
Photograph of two men looking at the door of the Learjet 23 prototype, February 18, 1964. A third man is visible inside the aircraft performing a test with an oscillograph.Inscription on verso: "Direct read out oscillograph loaned from Century…
Photograph of men installing a new engine in the Learjet 23 prototype, February 21, 1964.Inscription on verso: "Installing new engine on Jet #1 / 2-21-64."
Photograph of three men conducting tests on the Learjet 23 prototype, March 16, 1964.Inscription on verso: "Flight test instruction for ground test / T-76-3A / 3-16-64."
Photograph of a man working on the wing section of the Learjet 23 prototype, July 25, 1963. The forward fuselage section is visible in the background.Inscription on verso: "P3-E / July 25, 1963."
Photograph of the Lockheed-Sunnyvale 50 KVA System, circa 1960s-1970s.
Typed caption: "Lockheed-Sunnyvale 50 KVA System / Shown during final run-in with thermal instrumentation connected to inverters. (Reflections on front panel caused by temporary…
Photograph of the LJ23 Automatic Flight Control System, circa 1960s-1970s. The components are described in the caption.Typed caption on verso: "[letterhead: 'Lear Jet Corporation / Photo Release'] Components that make up the new LJ23 Automatic Flight…
Photograph of five Learjet aircraft (visible tail number N804L) under construction in a Lear hangar, Wichita, Kansas, circa 1960s. Inscription on verso: "Learjets in hangar in Wichita / Photo courtesy Lear Archives."