ESSIP Plan 2013
Ingrid FEIJT
DSS/EIPR
13.09.2013

 Implementation of ground-based Short Term Conflict Alert (STCA) safety net
 ECAC – wide applicable
 Requires implementation by all ATC units that provide surveillance
(= radar) services to General Air Traffic (GAT) within En-route airspace, in the Terminal Area (TMA) and or Control Zone (CTR).
 Military applicability: The Objective is applicable to military ANSPs that provide radar service to GAT traffic (Note: currently there are 8
MIL ANSPs across the ECAC region).
ESSIP Plan 2013 / Objective ATC 02.2
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 STCA checks the extrapolated track positions based on radar data
(current track position) and performs a linear extrapolation using the detected ground speed and predicts or establishes an actual conflict between a/c.
 A conflict is declared if a/c tracks are separated less than the minimum separation thresholds.
 Some Flight Plan (FP) data like Cleared Flight Level (CFL) can be used to suppress false alarms.
 STCA requires appropriate presentation of predicted/actual conflicts to the tactical controllers and ATC supervisor.
ESSIP Plan 2013 / Objective ATC 02.2
3

 [CM-0801] – Ground Based Safety Nets (TMA, En Route)
ESSIP Plan 2013 / Objective ATC 02.2
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 ASP01 “Implement STCA systems and associated procedures in line with EUROCONTROL Specification and related guidance material in En-Route airspace, applicable TMAs and Military ATC units providing radar services.
”
 ASP03 “Develop safety assessment for the changes, notably ATC systems and procedures that will implement STCA – level 2 functionality and associated procedures.
” together with:
 REG01 “Conduct safety oversight of changes. Verify that a safety assessment is conducted and review the safety assessment report before acceptance.
”
ESSIP Plan 2013 / Objective ATC 02.2
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 REG01 – The introduction of the change into service was accepted and a notification of acceptance has been provided to the ANSP.
 ASP01 – STCA function is implemented, documented and in operational use.
 ASP03 – The Safety Assessment report including safety arguments for the changes has been delivered to the NSA and a notification of acceptance was received.
 STCA implemented at ACC level?
 STCA implemented in all TMAs / Towers within CTRs that provide radar services?
 STCA parameters tuned to the operational environment (traffic, suppression of alarm in pre-defined areas, look-ahead time, warning time)?
 Safety assessment done and accepted by NSA?
 Notification of acceptance received from NSA?
ESSIP Plan 2013 / Objective ATC 02.2
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 EUROCONTROL Specification for Short Term Conflict Alert, updated
Edition 1.1, dated May 2009
 EC-Regulation (EU) No 1034/2011 of 17 October 2011 on safety oversight in air traffic management and air navigation services and amending Regulation (SU) No 691/2010
 EC-Regulation (EU) No 1035/2011 of 17 October 2011 laying down common requirements for the provision of air navigation services and amending Regulations (EC) No 481/2008 and (EU) No 691/2010.
 Relevant ESARR documents
 Safety assessment methods
ESSIP Plan 2013 / Objective ATC 02.2
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 18 States reported LATE .
 Implementation delays / not achieved due to:
 implementation of a new ATC System
 Implementation and/or validation/verification of STCA before putting into operation delayed
 Implementation of STCA in TMA area delayed
 Need to implement STCA to avoid impact on safety and achievement of expected safety benefits
ESSIP Plan 2013 / Objective ATC 02.2
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 Objective Coordinator:
FEIJT, Ingrid +32 2 729 5044 ingrid.feijt@eurocontrol.int
 DNM Objective Expert(s):
BAKKER, Ben +32 2 729 3149 ben.bakker@eurocontrol.int
DROZDOWSKI, Stanislaw +32 2 729 3760
Stanislaw.DROZDOWSKI@eurocontrol.int
ESSIP Plan 2013 / Objective ATC 02.2
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