Allison T40
TURBOPROP AIRCRAFT ENGINE FAMILY
Allison YT40; Allison T-40; Allison XT-40; Allison T44; Allison 500; Allison 503; Allison T39; Allison T54; Allison XT-40-A-2; Allison XT40-A-2; Allison XT40A; Allison T40-A-14; Allison T40-A-6; Allison T40-A-10; Allison YT40-A-6; Allison XT40
The Allison T40, company designation Allison Model 500, was an early American turboprop engine composed of two Allison T38 power sections driving a contra-rotating propeller via a common gearbox.