eATM Portal

ATC20 — Enhanced STCA with down-linked parameters via Mode S EHS

STCA (Short Term Conflict Alert) is a ground system designed and deployed as last Safety Net against the risk of collisions between aircraft due to separation loss. Enhanced STCA can be used both in En-Route and TMA radar environments to improve prediction of potential conflicts and reduce false alert rate. The difficulty of STCA development lies with the need to avoid a high false alert rate versus the need of ensure that all risk of collision always triggers a timely warning.

This objective addresses the enhancement of the STCA safety net with selected flight level (SFL) information down-linked from the suitably equipped aircraft via the Mode-S EHS protocol. Enhancing the STCA with the information downlinked from the aircraft will improve the warning times, decrease the rate of nuisance alerts and maintain or improve the rate of genuine alerts.

NOTE: The implementation of this functionality requires the appropriate equipment on board. The airborne carriage and operation of Mode S EHS capable transponders is addressed by objective ITY-SPI (ITY-SPI-USE06 and ITY-SPI-MIL02) based on the provision of Regulation (EU) No 2017/386.

NOTE FOR MILITARY AUTHORITIES: It is the responsibility of each military authority to review this Objective IN ITS ENTIRETY and address each of the SLoAs that the military authority considers RELEVANT for itself. This has to be done on top and above of the review of "MIL" SLoAs which identify actions EXCLUSIVE to military authorities.

Edition
2019
Stakeholders
Regulator / Air Navigation Service Provider
Type
SESAR
Scope
Local
Status
Active

Context

Related Elements

Applicability Area(s) and Timescales

Applicability Area:
(ACCs and collocated ACCs/APPs. Stand-alone APP Units providing services to more than 100K IFR movements per year. Subject to local need.)
Timescales From By Applicable to
Subject to local needs 31-05-2019

Links to SESAR Solutions

Links to PCP ATM Sub-Functionalities

ICAO Block Modules: No associated data

References

Applicable legislation
Regulation (EU) No 2017/386 amending Regulation (EU) No 1207/2011 (SPI)
Applicable ICAO Annexes and other references
None
Deployment Programme 2019
Operating Environments
Terminal Airspace
En-Route

Expected Performance Benefits

Safety
A comparative analysis of STCA enhanced with the SFL DAP against conventional STCA showed that the use of the SFL DAP improves warning times, decreases the rate of nuisance alerts and maintains or increases the rate of genuine alerts.
Capacity
No
Operational efficiency
No
Cost efficiency
No
Environment
No
Security
No
  Code Title From By Related Enablers
 
REG01 Mandate the airborne carriage and operation of suitable equipment (Mode S EHS transponders)
 
ASP01 Deploy enhanced STCA function with the use of Selected Flight Level downlinked parameter
 
ASP02 Develop and implement ATC procedures related to the availability for display and use of SFL in the STCA functionality
 
ASP03 Align ATCO training to address the availability and use of the SFL downlinked parameter
 
ASP04 Develop a local safety assessment
Code Dates
 
1999 99
2000 00
2001 01
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2011 11
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2025 25
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
ATC20
20190531
REG01
ASP01
ASP02
ASP03
ASP04

Supporting Material

Title Related SLoAs

EASA - CS ACNS - Certification Specifications for Airborne Communications Navigation and Surveillance - Issue 2 / 04/2019

https://www.easa.europa.eu/document-library/certification-specifications/cs-acns-issue-2

REG01

EUROCAE - ED-73E - Minimum Operational Performance Specification for Secondary Surveillance Radar Mode S Transponders 05/2011

https://eshop.eurocae.net/eurocae-documents-and-reports

REG01

EUROCONTROL - Air Navigation Systems Safety Assessment Methodology (SAM) - Version 2.1 / 11/2006

https://www.eurocontrol.int/tool/safety-assessment-methodology

ASP04

EUROCONTROL - EAM 4 - ESARR 4 - Risk Assessment and Mitigation in ATM - Edition 1.0 / 04/2001

https://www.eurocontrol.int/publication/esarr-4-risk-assessment-and-mitigation-atm

ASP04

EUROCONTROL - GUID-123 - EUROCONTROL Guidance Material for Short Term Conflict Alert - Edition 2.0 - 2.0 / 05/2009

https://www.eurocontrol.int/sites/default/files/publication/files/20090519-stca-guid-v2.0.pdf

ASP04

EUROCONTROL - SPEC-108 - EUROCONTROL Specification for Short Term Conflict Alert - 1.0 / 11/2007

https://www.eurocontrol.int/sites/default/files/2019-08/20071122-stca-spe-v1.0_0.pdf

ASP01, ASP02, ASP03, ASP04

ICAO - Doc 9871 - Technical Provisions for Mode S Services and Extended Squitter - Advanced Edition / 04/2012

https://store.icao.int/

REG01

SJU - SESAR Solution 69: Data pack for Enhanced STCA with down-linked parameters

https://www.sesarju.eu/sesar-solutions/enhanced-stca-down-linked-parameters

ASP01, ASP02, ASP03, ASP04

Consultation & Approval

Working Arrangement in charge
-
Outline description approved in
Latest objective review at expert level
Commitment Decision Body
Provisional Council (PC)
Objective approved/endorsed in
05/2019
Latest change to objective approved/endorsed in