Hazard No. 5 Loss of positional accuracy of reported position
Generic Description The accuracy performance of the navigational equipment in the aircraft has deteriorated to the level that it is not acceptable to support the specified separation standard.
Hazard Cause/Initiating Events Loss of ADS-B positional data to the controller. Increase in workload due to transitioning period back to procedural control and reassess traffic. This affects only one aircraft.
Initial Risk Residual
Risk
Likelihood Remote Improbable
Consequence Cat 3 Cat 4
Risk D D
Existing Mitigation
Safety Requirement Details
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
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
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.
Project ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 6 Incorrect processing of ADS-B data by the automation system
Generic Description
Incorrect processing of ADS-B data by the ground ADS B system leading to error in the reported position of the
aircraft concerned.
Hazard Cause/Initiating Events
Possible error in the displayed position of the aircraft therefore could lead to a breakdown in separation.
Initial Risk Residual Risk
Likelihood Remote 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
Procedure to remove Developed and published procedure to corrupted ADS B data remove corrupted ADS B data from the ground system to ensure that the Flight Data Record is not
updated.
Training to cover process to request alternate positional data Training must include the process and procedures for requesting alternate positional information from the pilot when
Formal testing of automation system Formal testing and validation of new functionality to the automation system to support processing and displaying of ADS-B tracks
Ability to enable and disable ADS B tracks Ensure ground system HMI is provided with the ability to select and deselect ADS B tracks
On-line integrity monitoring using site monitor A site monitoring system shall provide a degree of on-line integrity monitoring. A warning shall be issued to ATC if the site monitor is not received or indicates a low
NuC value
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