时间：2011-08-13 13:07来源：蓝天飞行翻译 作者：航空 点击：次
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SURVEILLANCE APPROACH (JCS) - An instrument approach conducted in accordance with directions issued by a controller referring to the surveillance radar display. SYSTEM STRATEGIC NAVIGATION/SN - Military activity accomplished by navigating along a preplanned route using internal aircraft systems to maintain a desired track. This activity normally requires a lateral route width of 10 nautical miles and altitude range of 1,000 feet to 6,000 feet above ground level with some route segments that permit terrain following. TACAN ONLY AIRCRAFT - An aircraft, normally military possessing TACAN with DME but no VOR navigational system capability. Clearances must specify TACAN or VORTAC fixes and approaches. TACAN/TACTICAL AIR NAVIGATION (P/CG) - An ultra-high frequency electronic rho-theta air navigation aid which provides suitably equipped aircraft a continuous indication of bearing and distance to the TACAN station. (See VORTAC) TACAN (JCS, NATO) - An ultra-high frequency electronic air navigation system which provides a continuous indication of bearing and distance (slant range) to the TACAN station, common components being used in distance and bearing determination. The term is derived from tactical air navigation. TAILWIND (P/CG) - Any wind more than 90 degrees to the longitudinal axis of the runway. The magnetic direction of the runway shall be used as the basis for determining the longitudinal axis. TAKE-OFF DISTANCE AVAILABLE (ICAO) - The length of the take-off run available plus the length of the clearway if provided. TAKE-OFF RUN AVAILABLE (ICAO) - The length of runway declared available and suitable for the ground run of an aeroplane take-off. TAKE-OFF SAFETY SPEED - A referenced airspeed obtained after liftoff at which the required one-engine-inoperative climb performance can be achieved. (Refer to Federal Air Regulations, Part 91) TARGET (P/CG) - The indication shown on a radar display resulting from a primary radar return or a radar beacon reply. (See Target Symbol, Radar) TARGET (ICAO) - In radar: (1) Generally, any discrete object which reflects or retransmits energy back to the radar equipment; (2) Specifically, an object of radar search or surveillance. TARGET RESOLUTION - A process to ensure that correlated radar targets do not touch. Target resolution shall be applied as follows: (1) Between the edges of two primary targets or the edges of the ASR-9 primary target symbol. (2) (3)
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