6  Engineering Design
6.1  The display specification shall be related to the operational requirement both in functional and performance terms (575).
6.2  Allowable error budgets for the display system shall be calculated and justified (576).
6.3  System Parameters
6.3.1 The following parameters shall be specified and justified in relation to the OR, technical specification and hazard analysis, as appropriate: a) Resolution (577). b) Accuracy (578). c) Precision (579). d) Max/Min ranges (580). e) Data load ('analogue' plus 'synthetic') and processing time. If the equipment is subjected to a high data load the operator shall be given a warning of the data that is shed (581).
Recommendation: For systems using remote SSR data for overlay, data discard should take place progressively from long range (582). f) MTBF (583). g) MTTR (584). h) Input type. Analogue, data formats, data transmission rates (585). i) Environmental performance (586). j) EMC performance (587). k) Quality standards applicable to equipment design, both hardware and software, shall be stated (588). l) Correct identification of radar source by validating radar source code (589). m)Identification of appropriate data input faults. This information shall be indicated within one radar scan interval (590).
7  Functional Parameters
7.1  Input Selection
The system shall be capable of showing the source of all data that the controller has selected for display on the radar display (591).
7.1.1  Recommendation: If a remote SSR data source is used the radar identification code should be decoded and displayed on the screen (592).
7.1.2  Return to default settings shall be achievable via the 'top level' menu (593).
7.2  The region of the boundary where composite picture processing is being used shall be indicated (594).
NOTE:  This is to indicate the area where track wander may occur.
7.3  Display of QNH
7.3.1  The display shall be capable of displaying QNH values (595).
7.3.2  Any manual changes to this value shall be validated by double entry (596).
7.3.3  When it is possible to change the QNH remotely, the equipment shall require the change to be drawn to the controller’s attention and confirmed on all other displays (597).
7.4  Target Filtering
7.4.1  When the display equipment can filter out targets from the situation display, the equipment shall be capable of displaying the parameters of such filters (598).
7.4.2  Recommendation: Display equipment should be fitted with a filter override allowing all targets to be displayed quickly (599).
NOTE:  Target filtering on the display may be based on different criteria including, height, area, type, SSR code and other Flight Plan derived data. The requirements and recommendations above apply to all such filtering.
7.5  Brightness
7.5.1  The brightness range, both overall and for individual screen elements, shall be restricted to the range determined in the colour assessment trial (600).
NOTE:  It should not be possible to delete radar targets completely by use of this control.
7.5.2  Recommendation: Target and map brightness should be independently variable (601).
7.6  Recommendation: The equipment should have the following operator functions: a) Selection of display ranges (602). b) Display off centre (603). c) Choice of maps (604). d) Range rings on/off (605). e) Choice of leader line length, SSR label block rotation and positioning (606). f) Prediction data, code/callsign selectivity (607). g) Choice of character size (608). h) Menu selection/positioning (609). i) Acceptance of error/alert messages (610).
7.7  Data Recording Facilities See SUR 10 for surveillance data recording requirements.
　
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