(MENAFN) According to its developer, China's indigenously improved AG600 large amphibious airplane has realized incessant development with numerous test planes entering the manufacturing phase. Main large parts of the No.3 AG600 test airplane and some test parts for iron-bird tests have lately entered the manufacturing stage, stated state-owned planemaker the Aviation Industry Corporation of China (AVIC). These main big parts comprise the nose, middle fuselage and back fuselage of the AG600 test airplane, which will perform the following tests for the big amphibious aircraft model. Iron bird tests are necessary to the designer and the authorities to confirm an aircraft model, main parts and airborne systems on the ground.