ACAS II Bulletin - Issue 5

4 October 2004

Recent experience, including the lessons from the Überlingen mid-air collision, confirms that ICAO standard ACAS operational procedures needed to be reinforced.Revised ACAS procedures and pilot training guidelines are now included in ICAO PANS-OPS Doc 8168. Other ICAO documentation, including PANS-ATM Doc 4444, is also being reviewed to ensure consistency and completeness.

In Europe, complementary action is being taken by JAA to ensure that JAR-OPS ACAS provisions and associated guidance material are in line. Furthermore, the Strategic Safety Action Plan (SSAP) requires, as a high priority, action to be taken by aviation regulatory authorities, air navigation service providers, and airspace users to confirm that these ACAS regulations and procedures are correctly implemented and applied. IATA and other airspace user organisations support these initiatives. Every effort must be made to ensure that the relevant operations manuals include up-to-date ACAS procedures, and that appropriate training is provided to ensure that pilots and controllers are able to apply these standard ACAS procedures consistently.

The ACAS II equipment, known as TCAS II, is an independent airborne safety net. Nevertheless, to ensure that its operational effectiveness is maximised, both pilots and controllers need to understand ACAS II operational principles, and correctly apply the standard operational procedures.


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ACAS II published bulletins regularly focusing on a different operational theme of interest to both aircrews and air traffic controllers.