At Phoenix-Mesa Gateway Airport in Mesa, Arizona, Flight Test Aircraft 4 (FTA-4) once again donned its black mask to continue with extreme temperature tests. FTA-4 was deployed in August and spent multiple days in the Arizona heat operating in a maximum temperature of 42° C, or 108° F. Engineers collected data that will be used to further validate the performance of the aircraft’s Environmental Control System (ECS), hydraulics system and powerplant. This natural hot weather test was a continuation of the testing completed earlier in the year at the McKinley Climatic Laboratory at Eglin Air Force Base in Florida. With

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