到1952年，航空局开启了第一个正式的雷达进离场管制。
By 1952, the agency had begun its first routine use of radar for approach and departure control.
离场控制，给用仪表飞行规则离场，和在某种情况下用目视飞行规则离场的飞机提供空中交通管制服务的进近管制设施的一种功能。
DEPARTURE control, a function of an approach control facility providing air traffic control service for departing IFR and, under certain conditions, VFR aircraft.
离场控制，给用仪表飞行规则离场，和在某种情况下用目视飞行规则离场的飞机提供空中交通管制服务的进近管制设施的一种功能。
DEPARTURE control, a function of an approach control facility providing air traffic control service for departing IFR and, under certain conditions, VFR aircraft.
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