| 释义 |
visual meteorological conditions
visual meteorological conditionsWeather conditions in which visual flight rules apply; expressed in terms of visibility, ceiling height, and aircraft clearance from clouds along the path of flight. When these criteria do not exist, instrument meteorological conditions prevail and instrument flight rules must be complied with. Also called VMC. See also instrument meteorological conditions.visual meteorological conditions
visual meteorological conditions (VMC) Weather conditions in which visual flight rules apply. It is expressed in terms of visibility, ceiling height, and aircraft clearance from clouds along the path of flight. When these criteria do not exist, instrument meteorological conditions prevail and compliance with instrument flight rules is required. The criteria for VMC with respect to different airspaces are indicated in the illustration. |