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General Motors' fourth proving ground is in the Air!
GENERAL MOTORS engineers are never satisfied with the results of laboratory tests alone. That's why we have three proving grounds where cars, trucks and military vehicles are tested under conditions that duplicate actual service. In addition, Allison operates a fourth - a proving ground in the air. 
At our flight test facility on Weir Cook Airport in Indianapolis, experimental and production models of Allison turbine engines are mounted in flying test beds in latest combat type aircraft and put through their paces under actual flight conditions. Over and above this, Allison has invested in its own Convair Liner to evaluate and demonstrate the application of Turbo-Prop engines in military and commercial transports. Allison engines have powered the Turbo-Liner on more than 150 individual flights-and the program of testing and development continues. 
This actual flight testing of Allison engines helps explain their constant improvement - in thrust, in fuel economy, in endurance and, in fact, all the factors that spell dependable, high-output performance. 
GM GENERAL MOTORS
Allison
DIVISION OF GENERAL MOTORS, INDIANAPOLIS, INDIANA
World's most experienced designer and builder of aircraft turbine engines
J35 and J71 Axial, J33 Centrifugal Turbo-Jet Engines, T38 and T40 Turbo-Prop Engines
NATIONAL AIRCRAFT SHOW