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  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. 20 Human error at Mode S transponder - turn off
Generic Description Human error at Mode S transponder leading to the unit being switched off or in the wrong mode. The impact is possible loss of          ADS B data. Identical hazard existed in radar.
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 Occasional Occasional
 Consequence Cat 3 Cat 4  Risk C D
Existing Mitigation This only applies to aircraft where pilot has access to the transponder unit. For some installations, the unit is
installed in a  position where the pil ot  has no access. 
Safety Requirement  Details   
Pilot training   Ensure pilot handbook, procedures and  training minimise the potential for human  error    
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  required    

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
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. 21 Human Error - at Mode S transponder - in wrong mode Generic Description Setting the transponder to the wrong mode - on ground - causing no altitude being sent by the squitter.  Hazard Cause/Initiating Events Incorrect altitude display to the controller.
  Initial Risk  Residual 
Risk 
  Likelihood  Probable  Occasional 
  Consequence  Cat 4  Cat 4 
  Risk  D  D 
Existing Mitigation 

Safety Requirement Details 
Pilot training Ensure pilot handbook, procedures and    training minimise the potential for human   error 
Training to cover  Training must include the process and   process to request  procedures for requesting alternate   alternate positional  positional information from the pilot when  data
Project   ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 22 Fail Altitude encoder
Generic Description Fail altitude encoder causing a reduced ability to obtain approach RAIM if we don't have a very high Q VFOM
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.
　
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