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data with FDP integrate the ADS-B data with existing FDP 
 function and display the ADS-B tracks with a 
 unique symbol on the controllers display.

Validate ATC  Validated ATS procedures to support the  
procedures services provided for ADS-B equipped aircraft

Project  ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 37 Altitude Display
Generic Description Possibility of controllers confusing Barometric and Geometric levels on display
Hazard Cause/Initiating Events Geometric level is displayed if the aircraft is at or below the transition altitude AND either Barometric Level is not  available or  the aircraft is not in a QNH defined area
Geometric Level  displayed in a different colour to distinguish it from Barometric Level (displayed in 
  Initial Risk  Residual 
Risk 
  Likelihood  Occasional  Occasional 
  Consequence  Cat 4  Cat 4 
  Risk  D  D 
Existing Mitigation 

track colour)
 
Geometric level will only be used for separation if checked within 200 ft of pilot report. This issue will be covered 
during training.

Safety Requirement Details 
Validate ATC  Validated ATS procedures to support the   procedures services provided for ADS-B equipped aircraft 
Use of Barometric and Ensure ATC procedures and training   Geometric levels adequately cover the use of Barometric and   Geometric levels in ADS B
Project      ICAO SASPOperational Use of ADS-B in Non Radar Airspace

Hazard No.   38 Altitude incorrect and not checked
Generic Description If separate pressure encoders are used for the ADS-B and SSR transponders, then there will be a requirement to check  the altitude display with the display in the cockpit whenever the aircraft initially enters either ADS-B or radar airspace
Hazard Cause/Initiating Events Separate pressure encoders used for ADS-B and SSR transponders, hence aircraft altitude source depends on type
of  
surveillance being used. 
  Initial Risk  Residual 
Risk 
  Likelihood 
  Consequence 
  Risk 
Existing Mitigation 

Safety Requirement  Details 
Project      ICAO SASPOperational Use of ADS-B in Non Radar Airspace

Hazard No. 39 Track couples to wrong Flight Plan
Generic Description 24-bit code and registration in Flight Plan is for another aircraft. The result is that an aircraft's ADS-B track may couple  to the wrong Flight Plan.
Hazard Cause/Initiating Events 24-bit code and registration in Flight Plan is for another aircraft. Could be a result of an aircraft substitution that is not  followed by cancellation and re-issue of flight plan.
  Initial Risk  Residual 
Risk 
  Likelihood 
  Consequence 
  Risk 
Existing Mitigation 

Safety Requirement  Details
 
 
 
 
 
 

 

 
 
APPENDIX 3

AMENDMENT PROPOSAL FOR PANS-ATM Doc 4444
 

 

　
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