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Analysis

Summary

It is possible that the inconsistent altitude readouts from the Shrike caused the B767 TCAS to predict a spurious high rate of closure. That prediction, in turn, caused the system to issue the traffic and resolution advisory alerts. Alternatively, it may have been that the rate of closure between the aircraft was sufficient to activate the alerts.

While the provision of traffic information to the B767 crew would have assisted their situational awareness, it would not have necessarily prevented the go around as the crew was required to comply with company TCAS procedures.

The TCAS processing cannot compensate for the relatively close aircraft proximities that can be achieved with visual separation standards. The occurrence highlights the potential risk to a traffic management plan when visual separation is used, especially with aircraft fitted with, and using, TCAS.

 
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