With regard to the conjectures and surmises of the outside world, Su Tzu-chuan, who was responsible for designing and manufacturing the aircraft's engine, will only say, "The progress and results from May 1989, when we started test flights, have been just as we originally expected." But air force Commander-in-Chief Lin Wen-li reveals that the IDF will be deployed to the troops in three or four years.
對外界的臆測與詢問，負責研製 IDF 發動機的舒孜川只表示：「從民國七十八年五月開始試飛至今，進度和結果都和原先的設計與預測一樣」，空軍總司令林文禮則透露，三、四年之內，IDF 就要分發到部隊。