相关题目
（ ） is a landing made on a runway aligned within 30-degree of the final approach course following completion of an instrument approach.
（ ） is the first 3000ft of the runway beginning at the threshold. The area is used for determination of Touchdown Zone Elevation.
（ ） is the beginning of that portion of the runway usable for landing.
（ ） is a general term used to describe airspace in which approach control service or airport traffic control service is provided.
（ ） is the length of runway declared available and suitable for the ground run of an airplane taking off.
（ ） is the length of the takeoff run available plus the length of the clearway, if provided.
（ ） is a geographical location in relation to which the position of an aircraft, is reported.
（ ） is a route assigned to pilot when any part of an airway or route is unusable because of NAVAID status.
（ ） is the line-of-sight distance between two points not at the same elevation.
Red on color weather radar denotes （ ） .
