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・ Surveillance aircraft
・ Surveillance and Control Training Unit RAAF
・ Surveillance and Response Group RAAF
・ Surveillance and Target Acquisition
・ Surveillance art
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・ Surveillance blimp
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・ Surveillance Detection Unit
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・ Surveillance Devices Act 2007 (NSW)
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・ Surveillance performance index
Surveillance radar approach
・ Surveillance system monitor
・ Surveillance Towed Array Sensor System
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・ Surveillante-class frigate
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Surveillance radar approach : ウィキペディア英語版
Surveillance radar approach

In aviation, approach surveillance radar (ASR or SRA) is a type of radar instrument approach provided with active assistance from air traffic control. The only airborne radio equipment required for radar approaches is a functioning radio transmitter and receiver. The radar controller vectors the aircraft to align it with the runway centreline. The controller continues the vectors to keep the aircraft on course until the pilot can complete the approach and landing by visual reference to the surface.
There are two types of radar approaches: Precision (PAR) and Surveillance (ASR).
A radar approach may be given to any aircraft upon request and may be offered to pilots of aircraft in distress or to expedite traffic; however, an ASR might not be approved unless there is an ATC operational requirement, or in an unusual situation or emergency. Acceptance of a PAR or ASR by a pilot does not waive the prescribed weather minimums for the airport or for the particular aircraft operator concerned. The decision to make a radar approach when the reported weather is below the established minimums rests with the pilot. PAR and ASR minimums are published on separate pages in the FAA's terminal procedures publication.
==A precision approach (PAR)==
This is one in which a controller provides highly accurate navigational guidance in
azimuth and elevation to a pilot. Pilots are given headings to fly, to direct them to, and keep their aircraft aligned
with the extended centerline of the landing runway. They are told to anticipate glidepath interception
approximately 10–30 seconds before it occurs and when to start descent. The published decision height will be given
only if the pilot requests it. If the aircraft is observed to deviate above or below the glidepath, the pilot is given
the relative amount of deviation by use of terms “slightly” or “well” and is expected to adjust the aircraft rate
of descent/ascent to return to the glidepath. Trend information is also issued with respect to the elevation of
the aircraft and may be modified by the terms “rapidly” and “slowly” (e.g., “well above glidepath, coming
down rapidly”). Range from touchdown is given at least once each mile. If an aircraft is observed by the
controller to proceed outside of specified safety zone limits in azimuth and/or elevation and continue to operate
outside these prescribed limits, the pilot will be directed to execute a missed approach or to fly a specified
course unless the pilot has the runway environment (runway, approach lights, etc.) in sight. Navigational
guidance in azimuth and elevation is provided the pilot until the aircraft reaches the published decision height. Advisory
course and glidepath information is furnished by the controller until the aircraft passes over the landing
threshold, at which point the pilot is advised of any deviation from the runway centerline. Radar service is
automatically terminated upon completion of the approach.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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