The assembly and installation of the vertical and horizontalstabilizers, cabin door, rudder and elevator assemblies are being concluded.
水平和垂直安定面、驾驶舱门、方向舵以及升降舵组件目前正在组装和安装。
2
That is, the tail section lacked horizontalstabilizers, so researchers could test a theory that those components were a key factor in stability problems at transonic speeds up to about Mach 0.9.