Today is the 50th birthday of the legendary Pratt & Whitney Canada PT6 turboprop. That first engine was delivered to Beech Aircraft Company for installation onto an aircraft that would become the equally-remarkable Beechcraft King Air. The PT6 had its genesis at what was then the United Aircraft of Canada Limited (UACL) factory in Longueuil, Quebec. In the mid-1950s, UACL had looked at the market and determined that there was a need for a small, efficient turboprop in the 500-shaft-horsepower (SHP) range.