The company also uses the 757 to test most of the engines it produces, including the HTF series, TFE731, and TPE 331- powerplants that are used in both military and corporate aircraft.
该公司还使用 757 测试其生产的大部分发动机,包括用于军用和公务机的 HTF 系列、TFE731 和 TPE 331 发动机。