The Avion was to incorporate a number of features that were intended to lower its radar cross-section (RCS), although this would not have been to the extent of being a true stealth aircraft. It was intended to be equipped with an advanced Electronic countermeasures (ECM)/Electronic counter-counter-measures (ECCM) suite, which was to be domestically developed in Yugoslavia.[2] The cockpit was also relatively advanced for the time, integration features such as a speaker recognition capability.[4] The Avion was often claimed to be an all-Yugoslav design, and was not based on any foreign fighter aircraft; however, France provided considerable technical assistance in designing many of the most complex components and elements of the aircraft that Yugoslavia lacked experience with, such as the Avion's multipurpose radar system.[10][2]