ACAS II Bulletin - Issue 23

20 June 2018

In this issue of ACAS Bulletin we describe events caused primarily by technical anomalies associated with the traffic collision avoidance system (TCAS), transponder, or altimeters.

To deliver its collision avoidance protection, TCAS depends on an aircraft’s transponder and altitude inputs – if either is lost the operation of TCAS will be compromised. As with any technical system, TCAS may sometimes fail or perform outside its design when presented with exceptional or unanticipated conditions.

In this issue

Using cases, varying from the loss of transponder, to self-tracking RA, to false altitude input, we will learn how the system failures affected TCAS operations and how pilots and controllers reacted in the circumstances.

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