时间:2011-03-11 23:11来源:蓝天飞行翻译 作者:admin 点击:次
convection current. The vertical movement of molecules of a fluid in a container that is being heated. The warmed fluid rises and forces the cold fluid down. convective condensation level (meteorology). The lowest level at which condensation will occur as a result of convection due to surface heating. When condensation occurs at this level, the layer between the surface and the CCL will be thoroughly mixed, the temperature lapse rate will be dry adiabatic, and the mixing ratio will be constant. convective instability (meteorology). The state of an unsaturated layer of air whose lapse rates of temperature and moisture are such that, when the air is lifted adiabatically until the layer becomes saturated, spontaneous convection will occur. convective SIGMET (weather advisory). A weather advisory concerning convective weather significant to the safety of all aircraft. Convective SIGMETs are issued for: 1. Severe thunderstorms with surface winds of 50 knots or greater or hail at the surface with a diameter of 3/4-inch or greater 2. 3. 4. 5.
conventional landing gear (airplane landing gear). The type of airplane landing gear with the main wheels ahead of the center of gravity and a small wheel supporting the tail when the airplane is on the converge. To draw closer together and eventually to meet. Converging lines are lines which, if continued, will meet and cross one another. |