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  systems C129A plus FD&E for GPS navigator and   TSO C112 (DO-181C) for Mode S   transponder are used for all aircraft   participating 
Parity check on data  Ensure parity check is available for all data   transmitted transmitted
Checking of ADS-B a/c Procedures shall be developed for cross  
  ident    checking of ADS-B positional data with data   provided by other navigational systems (not  GPS) in certain circumstances. 
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      
 

  Safety Function for  Route Adherence Monitoring processing (or similar) implemented in the   ADS-B tracks automation system for ADS-B tracks. 
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 
 Project ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 15 Satellite Failure - Predicted (NANU)

Generic Description
Possible loss of ADS B service due to loss of good NUC from some aircraft.

Hazard Cause/Initiating Events
ADS B tracks will not be displayed on the controller HMI therefore will cause an increase in workload due to the 
requirement to transition back to procedural control. 
 Risk     Likelihood Consequence Risk  Initial Risk Probable Cat 4 D  Residual Probable Cat 4 D 
Existing Mitigation 

Safety Requirement Details 
BARO aiding for  Ensure BARO aiding available if required  navigator
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
Procedure for RAIM  Ensure satellite outages are taken into   predictions and  account in RAIM and ensure procedures  updates (distribution of RAIM predictions and   updates) and instructions available 
                (including training)
Project ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 16 Satellite Failure - Unpredicted Detected by FDE 4Nm  Detected by FDE- 4Nm Oceanic FDE  Satellite Failure - Unpredicted -   Detected by FDE- 4Nm Oceanic FDE  Satellite Failure - Unpredicted - Detected by FDE - 4Nm  Satellite Failure - Unpredicted - Detected
Generic Description Satellite Failure - Unpredicted -  Detected by FDE- 4Nm Oceanic FDE leading to the navigator flag reduced NUC. RAIM loss leading to possible loss of  ADS B
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.
  Initial Risk  Residual 
Risk 
  Likelihood  Improbable  Improbable 
  Consequence  Cat 3  Cat 4 
  Risk  D  D 
Existing Mitigation 

Safety Requirement Details 
Procedures for  Ensure procedures as per radar - revert back   reverting to Flight  to Flight Plan Track, is availlable for ADS B Plan Track
BARO aiding for  Ensure BARO aiding available if required  navigator
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
　
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