Initial Risk Residual
Risk
Likelihood Remote Remote
Consequence Cat 3 Cat 3
Risk D D
Existing Mitigation
Safety Requirement Details
Processing based on Automation system to detect the reduction accuracy performance in accuracy performance and not used that data if it is below the threshold of NUC = VSP (Variable System Parameter- typically 5) and display appropriate visual notification to the controller concerned.
Remove ADS-B tracks When downlink positional data is reduced for poor positional below NUC = VSP (Variable System Parameter - typically 5), ADS-B tracks will be removed within 30 secs
Transition Process for Training and lesson plans to adequately ADS-B Failure cover the transition process and procedures from ADS-B control to procedural control
On-line integrity A site monitoring system shall provide a monitoring using site degree of on-line integrity monitoring. A monitor warning shall be issued to ATC if the site monitor is not received or indicates a low NuC value
ADS-B Fallback Validated and published instructions procedure for reverting back to procedural control
Project ICAO SASPOperational Use of ADS-B in Non Radar Airspace Hazard No. 13 Inaccuracy of positional data for aircraft in manoeuvring Generic Description Failure to detect aircraft in manoeuvring between display updates. Hazard Cause/Initiating Events If the positional error between updates is larger that the separation standard, this could lead to a breakdown in
Initial Risk Residual
Risk
Likelihood Remote Improbable
Consequence Cat 3 Cat 3
Risk D D
Existing Mitigation
Safety Requirement Details
ADS-B Ground System Allocate an availability requirement of Availability 0.9995 to the ADS-B ground station sub Specification
ADS-B avionics Only avionics equipment certified to TSO
systems C129A plus FD&E for GPS navigator and TSO C112 (DO-181C) for Mode S transponder are used for all aircraft participating
Comprehensive Tested and proven ADS-B ground stations testing of ADS-B with comprehensive checking of integrity Ground System data (e.g. use of checksums in ADS B messages) are used for the trial
Accuracy better than Accuracy performance shall be better than conventional SSR of a conventional SSR radar radar
Azimuth resolution Azimuth resolution performance shall be better than to better than to conventional SSR radar conventional SSR radar
Project ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 14 Incorrect data sent by aircraft transponder due to fault in GPS unit
Generic Description
The GPS unit reports incorrect positional information but still provide the required FOM
Hazard Cause/Initiating Events
Error in the reported position without the controller awareness therefore could lead to a breakdown in separation.
This
only impacts a single aircraft.
Initial Risk Residual Risk
Likelihood Improbable Improbable
Consequence Cat 3 Cat 3 Risk D D
Existing Mitigation
Controller observes tracks with respect to reference data (e.g. maps, radar returns, etc)
Safety Requirement Details
ADS-B avionics Only avionics equipment certified to TSO
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