4.2  Accuracy The radar position displayed shall be within 0.5 NM of the true aircraft position (614).
4.3  Coverage
The radars used for display shall detect targets down to at least 200 feet below the minimum sector altitude. In the runway approach zone the radar shall detect targets down to 100 feet below the nominal glide angle to the terminating range (615).
5  Functional Requirements
5.1  Runway Selection
5.1.1  Recommendation: The system should be capable of automatic adjustment of range and centre on runway change (616).
5.2  Video Maps
5.2.1  The display shall show the runway centreline (617).
5.2.2  Recommendation: The system should indicate ranges from the radar touchdown in 1 NM increments (618).
5.2.3  The video map shall indicate the threshold position (619).
5.3  Data Source
NOTE:  The aerodrome traffic monitor may obtain data from any combination of remote/local/secondary radar that meets the coverage and accuracy requirements.
5.3.1  Recommendation: If labelled aerodrome traffic monitor is provided, handover procedures should positively identify all targets (620).
5.4  Resolution
5.4.1  The equipment shall resolve two targets at 1 NM separation (621).
5.4.2  The labels shall not cross at 2 NM separation (622).
5.5  Track Guidance
Recommendation: Prediction vectors or trail dots should be used to indicate approach speed (623).
6  Display
6.1  Display Size
Recommendation: A screen size capable of displaying a circle of at least 150 mm diameter (624).
6.2  Readability
6.2.1  The display shall be readable in all ambient light conditions (625).
6.2.2  The display shall be readable over a range of viewing angles, both vertically and horizontally (626).
6.2.3  Recommendation: Displays requiring viewing hoods should not be used (627).
NOTE:  High intensity daylight viewing displays and/or brightness controls fitted to the equipment can achieve the same effect.
6.3  Colour Display
6.3.1  Colour shall not be used for information coding (628).
NOTE:  Displays may use colour but only in conjunction with brightness and symbology to aid de-cluttering of screen information.
6.3.2  Recommendation: Where displays use colour for decluttering, it should be ensured that the contrast control is not available in normal use (629).
6.4  Position
6.4.1  The aerodrome traffic monitor equipment shall be positioned so that the operational controller can easily note and act on the information shown (630).
6.4.2  Recommendation: The screen should be located at the operational position (631).
6.5  Display Orientation
NOTE 1:  The orientation of the picture in relation to the view from the VCR will depend on the tasks carried out by the Controller.
At a unit where the controller has clearly defined and fairly narrow tasks to perform the orientation is to be such that the runway on the aerodrome traffic monitor is aligned with the view of the runway from the control position (632).
NOTE 2:  In such cases where the SMR picture is not aligned with the view of the runway from the VCR then the Human Factors risks that this may pose shall be addressed in the supporting Safety Assurance Documentation (2383).
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SUR 08  Ergonomic Aspects for ATS Surveillance Data Display Systems
Part 1 Preliminary Material
1  Introduction
1.1  All surveillance systems require an input device to enable the operator to configure the display as required (634).
1.2  This interface clearly affects the efficiency of the operator and can affect the safety of operation. An assessment must be carried out to confirm the adequacy of the chosen design (635).
　
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