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a) for non-automated systems from the wind direction and speed indicators or from the anemograph recorder trace if available (73); and/or
b) for automated systems from the actual measured values of wind direction and speed, and not from the two-minute and ten-minute running averages required under paragraph 3.3.4.6 (74).
3.3.3.8 In reports for take-off, surface winds of 6 km/h (3 kt) or less shall include a range of wind directions, whenever possible (75).
NOTE: A marked discontinuity occurs when there is an abrupt and sustained change in wind direction of 30° or more, with a wind speed of 20 km/h (10 kt) or more, lasting at least two minutes.
3.3.3.9 Where multiple sensors are installed, the two-minute time averages of and significant variations in the surface wind direction and speed for each sensor used in reports for take-off and landing are to be monitored by automatic equipment (76).
3.4 RVR Data
3.4.1 RVR data derived by Instrumented Runway Visual Range equipment shall be derived and displayed as described in Part C, Section 2, NAV 01 (1787).
3.4.2 RVR data derived by the Human Observer method shall be displayed in operational positions as a distance (measured in m) determined from conversion tables approved for the purpose (1788).
3.4.3 The procedures for converting the human observer reports into RVR values shall be described in the unit MATS Part 2 (1789).
3.5 Multi-function Displays
If a single data display is used to display both meteorological and other information it shall not display erroneous information because of the failure or incorrect operation of those other information sources (1790).
4 Contingency Arrangements
4.1 ATS Providers shall identify the effect of equipment failure (or other cause of the loss of meteorological information) on the provision of the air traffic control service (1791).
4.2 Wherever practical, alternative sources of information or other mitigation measures shall be identified and the associated operational procedures documented (1792).
5 Recording
5.1 Recommendation: The data displayed at control positions should be recorded and the records should be retained for at least 30 days (1799).
5.2 Recommendation: It should be possible to recreate reliably the appearance of the data display at an operational position from the recorded data (1800).
Part C, Section 5, Information and Alerting Systems
IAS Information and Alerting Systems
Part 1 Preliminary Material
1 Introduction
1.1 Information and alerting systems used in the provision of an Air Traffic Service are required to be approved for use under the terms of Article 205 of the Air Navigation Order.
1.2 This document may be used in isolation or in conjunction with other requirements documents published by the CAA.
2 Scope
This document sets out the safety requirements for information and alerting systems used at locations within the United Kingdom providing Air Traffic Services.
Part 2 Requirements
3 Status Indicators
Any equipment or facility which has a direct effect on aircraft safety shall have a display showing its status, if not readily apparent, visible to the controller (205).
4 Data Display Systems (DDS)
4.1 Providers must satisfy the CAA that the system is adequate for its purpose by design or by procedural mitigation (210).
NOTE: If the system is not capable of demonstrating the required level of safety, for example, because integrity or reliability is not as predicted, then it will be acceptable to include procedures in MATS Part 2 which mitigate deficiencies to ensure that a failure (total or partial) is not hazardous. Included in these procedures will be details of alternative sources of safety-related information.
4.2 All systems on which information is displayed to ATC for operational use should be designed, installed, configured and maintained in a manner which ensures the integrity of the information (211). As the hazard to aircraft of passing incorrect, misleading, corrupt or anomalous information can vary according to its phase of flight, the integrity requirements will vary accordingly.
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CAP 670 Air Traffic Services Safety Requirements 2(107)
