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5.3.2.1  As this site is within the clear and graded area, the support structure shall be frangible and less than 0.9 metres high above local ground level (547).
6  Use of Markers
6.1  The sets of markers shall allow the controller to confirm the correct position of the SRA approach line (548).
6.2  Recommendation: The marker system should contain an active monitor that checks the primary radar performance (549). Such primary radar monitors should evaluate: a) Primary radar spectrum (550).
b) Primary radar power level (551).
c) Primary radar beamwidth (552).

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SUR 06  Display System Engineering Requirements for ATS Surveillance Systems
Part 1 Preliminary Material
1  Introduction
1.1  When a surveillance data display is intended for use for Air Traffic Control purposes it must comply with safety standards.
1.2  This document sets out the technical requirements relating to those safety standards that are concerned with the approved use of surveillance data displays by Air Traffic Control units.
1.3  Guidance material on issues to consider when changing display technology is available at the following link: www.caa.co.uk/ATSDocuments
2  Scope
This document applies to all display equipment used for the presentation of surveillance data used for the provision of Air Traffic Services.
Part 2 Requirements
3  Safety Objective
The display system shall preserve the accuracy, availability and integrity of the input data and reproduce it in an unambiguous and clear manner (1712).
4  Display Characteristics
4.1  The following shall be assessed to determine suitability/appropriateness for the operational requirement: a) Screen area and corresponding displayed range (553). b) The number of display lines (554). Recommendation: The number of lines should be greater than 1000*1000 (555). c) Linearity and screen astigmatism (556). d) Frame refresh rate (557). Recommendation: Frame refresh should be 75 Hz (or greater), non-interlaced (558). e) Selection of synthetic phosphor decay (559). f) Ability to display system status information (560). g) The chosen display brightness and luminance and their variation (561). h) The ambient lighting (562). i) The colour set shall be assessed as appropriate for the operational requirement (563). Recommendation: Some colours should be reserved for future requirements (564). j) A system shall be in place that allows the colour set to be calibrated (565). k) Colour calibration checks shall be carried out at intervals appropriate to the system stability (566).
5  Symbology
5.1  The symbology set selected shall be assessed for suitability to the OR (567).
NOTE:  The on-screen positioning of menu selection and video map symbology is of particular importance.
5.2  Recommendation: The equipment should not display any symbol indicating the position of particular filtered targets (568).
5.3  Special Purpose Codes
5.3.1  The equipment shall draw the attention of the controller by flashing the associate label if it detects one of the emergency codes listed below (569):
7700 : SOS
7600 : RT FAIL
7500 : HIJACK

5.3.2  Recommendation: An audible alarm should also be sounded (570).
5.3.3  Recommendation: The equipment should display both the emergency code and the previous callsign or code if unconverted (571).
5.4  Symbol Size Recommendation: The symbol size should not vary with displayed range (572). NOTE: Some features, map features for example, will be scaled according to their
significance on the displayed ranges.
5.5  Leader Lines
Where the display automatically moves the labels to various positions (to prevent label overlapping) the equipment shall provide leader lines (573).
5.6  Contrast Control
　
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本文鏈接地址：CAP 670 Air Traffic Services Safety Requirements 2(89)