 This prototype was flight-tested at least once when it achieved a speed of Mach 2.1 with the Egyptian Brandner E-300 engine.A total of 135 million Egyptian pounds was spent on the development, while the E-300 engine was transferred to the Indian government for use in the HAL HF-24 Marut fighter.The HA-300 fighter was originally designed around the afterburning Bristol Siddeley Orpheus Orpheus 703-S-10 turbojet, but aside from whether the British would even release it for use by the Egyptians, President Nasser saw that being dependent on a British engine was a major threat to national security, due to the potential for an embargo to ground the aircraft thanks to continued British hostility toward Egypt following the 1956 Suez crisis when Britain, France and Israel invaded Egypt.