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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