【正确答案】It is necessary for the industrial sector and government agencies to institute explicit guiding ideology for the planning, research and manufacture of aeronautical test facilities. This guiding ideology has to connect planning and development of facilities with both technical and commercial goals, following the trend of basic technological development. The condition for the approval of planning exerts a strong influence over it. Normally, the most difficult part is to raise a large sum of fund for capital construction as soon as possible so that equipment will be provided in time and research needs fulfilled.
Various future aircrafts are usually examined on the basis of flight mission types, and basic technological development trend is predicted based on following five crucial factors; total weight, size, flight altitude, maximum flight speed and propulsive force and power. Distinct development trend has been evident in all these five factors, showing a strong need for new facilities.