| http://www.w3.org/ns/prov#value | - Piper introduced the lower powered (373kW/500shp PT6A-11s) and less expensive Cheyenne I in 1978, and renamed the original Cheyenne the Cheyenne II. Refinements to the Cheyenne I made in 1983, including more power at altitude, revised cowlings and interior, resulted in the Cheyenne IA. Meanwhile the stretched Cheyenne IIXL had been introduced in 1979.
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