Blackhawk Modifications has received European Aviation Safety Agency (EASA) approval for its engine upgrade for the King Air C90A/B. The Waco, Texas firm replaces the C90’s standard engines with two 750-shp Pratt & Whitney Canada PT6A-135s to give the turboprop twin a true airspeed increase of about 35 knots. Takeoff and climb speeds are also improved, the company said.