Existing airborne collision avoidance systems (ACAS) triggers resolution advisories when a collision risk is predicted. False alerts can be caused by aircraft correctly climbing or descending to a cleared flight level close to the level occupied by another aircraft. This can reduce the system’s safety benefits and make air traffic control operations more complex. ICAO has recommended new altitude capture laws that automatically reduce the vertical rate at the approach to the selected flight level, reducing unnecessary traffic advisories.
SJU references: #105/Release 1
- Safety levels are maintained
- Compatibility between ACAS operations and air traffic management improvements
- Increased air navigation service provision
- Resolution advisories are more consistent
- Shorter response time for resolution advisories