Beechcraft King Air 250 operators are accustomed to cruising at 300 KTAS or faster, nipping at the tail of Beech’s top-line King Air 350i. If you race the two aircraft on a 300- to 1,000-nm mission with four passengers aboard, the pair never arrive more than a minute apart, according to BCA’s May 2014 Purchase Planning Handbook.
Equally impressive is the King Air 250’s takeoff performance, clearly superior to all previous King Air 200 models including its predecessor, the 2008 to 2011 B200GT, with which it shares its highly flat-rated 850-shp Pratt Whitney Canada PT6A-52 engines. All-engine takeoff distance over a 50-ft. obstacle is only 2,111 ft., assuming standard day conditions. Up at BCA’s hypothetical 5,000-ft. elevation, ISA+20C airport, all-engine takeoff distance is just over 3,100 ft. These are the best takeoff performance numbers of any King Air 200 model yet built.
Notably, the aircraft also has impressive one-engine-inoperative (OEI) takeoff performance. Takeoff field length, based on accelerate-stop distance, is 3,687 ft., and actually longer than accelerate-go distance. Departing at 5,000 ft., ISA+20C, takeoff field length is less than 5,300 ft. This is in vivid contrast to the B200 models powered by -41 and -42 engines that set no records for scintillating OEI takeoff and climb performance.
“There is an incredible performance difference between the -42 and -52,” says Jim Smith, who flies s.n. BY-0193 for TJ Aero, based in Kennesaw, Georgia. “The three things I like best are climb performance, cruise performance and descent performance. You
Article source: http://aviationweek.com/business-aviation/operators-survey-king-air-250

