Safety Requirement Details
Safety Function for Route Adherence Monitoring processing (or similar) implemented in the ADS-B tracks automation system for ADS-B tracks.
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.
Parity check on data Ensure parity check is available for all data transmitted transmitted
Coupling Ensure REG and 24 bit code are required for coupling. Also, ensure no coupling until the flight plan is coordinated.
Project ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 26 GPS Antenna failure
Generic Description A GPS antenna failure causing the transponder to stop squitting when data is not refreshed every 2 secs. This has the same
effect as an unpredicted satellite failure except it only affects one aircraft. There will be a loss of ADS B data
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 Remote Improbable
Consequence Cat 3 Cat 3
Risk D D
Existing Mitigation
Safety Requirement Details
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
Project ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 27 Incorrect 24 bit code
Generic Description
Incorrect 24 bit code programmed in the aircraft. This will cause a mismatch with the Flight Plan and incorrect TCAS
operations. The effect is failure to couple or incorrect coupling. The probability of incorrect coupling is lower than
SSR
because the code is set by maintenance and not the pilot.
Hazard Cause/Initiating Events Incorrect coupling
Initial Risk Residual
Risk
Likelihood Occasional Remote
Consequence Cat 4 Cat 4
Risk D D
Existing Mitigation
Safety Requirement Details
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.
Checking of 24 bit Ensure 24 bit code is adequately checked at code at installation installation and the covered in the avionics maintenance procedures
Detecting of incorrect Ensure the ground test set detects the 24 bit code incorrect 24 bit code during installation check and test.
Project ICAO SASPOperational Use of ADS-B in Non Radar Airspace
Hazard No. 28 Failure of Communications link
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