The rudder_lock of aircraft is one of the hiden dangers to the flight safety. The requirements of military standards and CCAR 25 and analysis the reason resulting the rudderjock are firstly introduced. Then the im-provments was indroduced. At last , the example of rudderjock in flight test is showed to prove the right of improv-ment.%飞机自动上舵是影响飞机飞行安全的较大隐患之一.首先介绍了国军标和适航条款中针对“自动上舵”的要求.分析了自动上舵产生的原因,并提出了具有普遍意义的改进措施.最后利用试飞中自动上舵现象的成功解决,证明了提出的改进措施的正确性.
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