The PW600 family of small turbofans, in the form of a 2,500-lb-thrust demonstrator engine, entered flight test last month mounted on P&WC’s Boeing 720 testbed. The engine was tested to an altitude of 43,000 ft and performance, handling and relight testing “exceeded our expectations,” said P&WC director of small turbofans Maurice Weinberg. The engine has not yet been selected for any specific airframe.