Pratt & Whitney's F135 system and development demonstration (SDD) test program is quickly gaining momentum with seven engines planned to be under evaluation by midsummer. FX631--the first of the SDD F135s--began running at the company's West Palm Beach, Fla., test center in October and has accumulated more than 246 hr. Initial trials examined sea-level operability, fan performance and augmentor operability of the conventional takeoff and landing (CTOL) configured powerplant. ...

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