The mounting tempo of new commercial airliner development programs has heaped unprecedented pressure on engine makers to bolster test capabilities and, in particular, to modernize their flying testbeds. For Pratt & Whitney, the introduction of its second Boeing 747SP test aircraft completes more than 10 years of preparations for meeting the daunting challenge of multiple, fast-paced geared turbofan (GTF) test programs. Together with a sistership, which flew the first GTF ...

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