时间:2011-09-16 15:17来源:蓝天飞行翻译 作者:航空 点击:次
(See SPECIAL USE AIRSPACE.) ALERT NOTICE- A request originated by a flight service station (FSS) or an air route traffic control center (ARTCC) for an extensive communication search for overdue, unreported, or missing aircraft. ALERTING SERVICE- A service provided to notify appropriate organizations regarding aircraft in need of search and rescue aid and assist such organizations as required. ALNOT- (See ALERT NOTICE.) ALONG-TRACK DISTANCE (ATD)- The distance measured from a point‐in‐space by systems using area navigation reference capabilities that are not subject to slant range errors. ALPHANUMERIC DISPLAY- Letters and numer-als used to show identification, altitude, beacon code, and other information concerning a target on a radar display. (See AUTOMATED RADAR TERMINAL SYSTEMS.) ALTERNATE AERODROME [ICAO]- An aero-drome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or to land at the aerodrome of intended landing. b. c..
ALTITUDE RESERVATION- Airspace utilization under prescribed conditions normally employed for the mass movement of aircraft or other special user requirements which cannot otherwise be accomplished. ALTRVs are approved by the appropriate FAA facility. ALTITUDE RESTRICTION- An altitude or alti-tudes, stated in the order flown, which are to be maintained until reaching a specific point or time. Altitude restrictions may be issued by ATC due to traffic, terrain, or other airspace considerations. |
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