Pratt & Whitney's uniquely configured Boeing 747SP recently made its debut as the industry's newest engine flying testbed with Pratt & Whitney Canada's PW308C, and is now flying the PW1200G for the Mitsubishi Regional Jet. Pratt has adapted the aircraft, its second 747SP, to flight-test a wide range of airliner, business jet and turboprop engines. In addition, Pratt is flight-testing its second geared turbofan model (see p. 39). Spencer Sloan/Pratt & Whitney photo.

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