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The Pilatus PC-9 is a single-engine, low-wing tandem-seat turboprop training aircraft designed and manufactured by Pilatus Aircraft of Switzerland.. Developed as a more powerful evolution of the preceding Pilatus PC-7, the PC-9 features an enlarged cockpit and a ventral airbrake while possessing only a low level of structural commonality with its predecessor.
[1] [2] [3] It was developed by Duolingo in 2014 as Test Center [4] and grew in popularity and acceptance at universities during the COVID-19 pandemic. [5] [6] [7] The test is used by around 5,500 university admissions offices, including Harvard, Stanford, MIT, and Yale. [8] [9] Ireland accepts the test as part of its student visa program. [1]