选词填充(2): manual; determine; factor; safety; operating; CG; maintained; structure; weight; aircraft Weight and balance is a key (1)______ in not only design, but in the performance and stability of an aircraft under various( 2)______ conditions. Balance is (3)______ through the Center of Gravity (C.G.) , whose location determines (4)______ characteristics. Position of the center of gravity is affected not only by the total but also the distribution of (5) weight throughout the aircraft . Weight parameters ensure the wings and overall (6)______ are able to support the aircraft throughout all flight envelopes ( 飞行包线 ). Prior to every flight, pilots must (7)______ the weight and balance to ensure the aircraft is operated in accordance with the (8)______. Weight and balance data is more than an exercise in determining where an aircraft's (9)______ will fall. It is a (10) ______ concern that has cost the lives of several pilots and their passengers.