From: email@example.com (Kevin Au) Organization: University of California, Berkeley Date: 26 Mar 94 12:20:01 PST References: 1
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This sounds like a familiar problem. AW&ST had been talking about problems with TCAS in situations where one aircraft is descending and another is ascending. The problem is that TCAS senses the approaching aircraft, but does not know that it is about level off. It projects the expected trajectories as if they were to continue their climbs or descents and issues an RA that may tell one plane to climb steeper or another plane to descend steeper. This seems to be what had happened again at PDX.