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STOP STREAM/BURST/BUZZER - Used by Air Traffic Control to request a pilot to suspend electronic countermeasure activity. (See Jamming)
STOPWAY - An area beyond the take-off runway designated by the airport authorities as able to support an airplane during an aborted take-off. (Refer to Federal Air Regulations, Part 1)
STRAIGHT-IN APPROACH, IFR - An instrument approach wherein final approach is begun without first having executed a procedure turn. Not necessarily completed with a straight-in landing or made to straight-in landing minimums. (See Straight-in Landing, Landing Minimums, Straight-in Approach-VFR)
STRAIGHT-IN APPROACH, VFR - Entry into the traffic pattern by interception of the extended runway centerline (final approach course) without executing any other portion of the traffic pattern. (See Traffic Pattern)
STRAIGHT-IN LANDING - A landing made on a runway aligned within 30 degrees of the final approach course following completion of an instrument approach. (See Straight-in Approach-IFR)
STRAIGHT-IN LANDING MINIMUMS/STRAIGHT-IN MINIMUMS - (See Landing Minimums)
SUBSTITUTE ROUTE - A route assigned to pilots when any part of an airway or route is unusable because of navigational aid status. These routes consist of:
(1)
Substitute routes which are shown on United States Government Charts.

(2)
Routes defined by Air Traffic Control as specific navigational aid radials or courses.

(3)
Routes defined by Air Traffic Control as direct to or between navigational aids.

SUNSET AND SUNRISE - The mean solar times of sunset and sunrise as published in the Nautical Almanac, converted to local standard time for the locality concerned. Within Alaska, the end of evening civil twilight and the beginning of morning civil twilight, as defined for each locality.
SUPER HIGH FREQUENCY/SHF - The frequency band between 3 and 30 gigahertz (gHz). The elevation and azimuth stations of the Microwave Landing System operate from 5031 megahertz to 5091 megahertz in this spectrum.
SURFACE AREA (P/CG) - The airspace contained by the lateral boundary of the Class B, C, D, or E airspace designated for an airport that begins at the surface and extends upward.

SURVEILLANCE APPROACH (P/CG) - An instrument approach wherein the air traffic controller issues instructions, for pilot compliance, based on aircraft position in relation to the final approach course (azimuth), and the distance (range) from the end of the runway as displayed on the controller's radar scope. The controller will provide recommended altitudes on final approach if requested by the pilot. (See PAR Approach)
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.
　
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