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7.8 Derived Warning or Alerting Information (Safety Nets)
7.8.1 Recommendation: ATC Service Providers should assess the risks to aircraft that can be addressed by deriving warning or alert information from available surveillance data and, where appropriate, incorporating facilities into surveillance display (or associated) systems (2316). Typical warning systems, known as safety nets, include:
MSAW - Minimum Safe Altitude Warning STCA - Short Term Conflict Alert APM - Approach Path Monitor APW - Airspace Proximity Warning RIMCAS - Runway Incursion Monitoring and Collision Alerting System NOTE 1:Where safety net systems such as STCA, MSAW, APM and/or APW are
deployed, ANSPs shall consider the ATC Contingency Procedures defined in Section 15.7 of ICAO Doc 4444 PANS-ATM in devising procedures applicable to each associated safety net.
NOTE 2:The EUROCONTROL Safety Regulation Commission (SRC) some time ago agreed that Safety net Policy should allow the crediting of SafetyNets to achieve a Target Level Of Safety.
Reference can be made to SRC Publication EAM 4/GU 16 - Explanatory Material on Ground Based Safety Nets, which states:
'5.5 Achieved Level of Safety Ground based safety nets do have an impact on the achieved level of safety of the total ATM system.'
and
'12. The effect and contribution of ground based safety nets may be taken into account when an ANSP determines the achieved level of safety.' SRC Publication EAM 4/GU 16 is available at: http://www.eurocontrol.int/src/gallery/content/public/documents/
deliverables/esarr4_awareness_package/eam4gui6_e1.0_ri_web.pdf
7.8.2 Recommendation: Where a Service Provider chooses not to install warning facilities where a significant risk is identified (such as Controlled Flight Into Terrain), it is expected that clear evidence that it is impractical to install the system will be provided (2317).
7.8.3 Any warning and alerting information derived from surveillance data shall be presented to the controller in a manner that does not result in any detrimental impact to the routine provision of air traffic control services (2318).
7.8.4 Measures shall be taken to minimise the presentation of 'nuisance' alerts (2319).
7.8.5 It shall be possible to silence an audible alert, whilst continuing to present visible information for as long as a hazard exists, so as to avoid any detrimental impact to the routine provision of air traffic control services (2320).
7.8.6 Training shall be provided to Air Traffic Controllers in the use of, and any limitations of safety nets that have been installed as part of the surveillance display (2321).
7.8.7 Recommendation: Where installing an STCA system it should comply with the Eurocontrol Specification for Short Term Conflict Alert (Reference: EUROCONTROL-SPEC-0108) available from the Eurocontrol website (www.eurocontrol.int) (2322).
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SUR 07 Aerodrome Traffic Monitor Safety Requirements
Part 1 Preliminary Material
1 Introduction
The aerodrome traffic monitor equipment must be approved by the CAA under Article 205 of the ANO (612). The aerodrome traffic monitor is also known as the Distance From Threshold Indicator (DFTI).
2 Scope
This document applies to all surveillance sensor equipment providing data for an aerodrome ATS. The following requirements are applicab sensor equipment providing data for an aerodrome ATS. The following requirements are applicable for the installation and use of equipment provided for the aerodrome traffic monitor. This document covers all systems using local or remote data.
Part 2 Requirements
3 Safety Objective
The aerodrome traffic monitor shall provide accurate and uncorrupted data for the confirmation of aircraft position and identity (1713).
4 Performance Requirements
4.1 Range
In normal operation the aerodrome traffic monitor shall not display traffic more than
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CAP 670 Air Traffic Services Safety Requirements 2(91)
