Changes to the airspace management system which were introduced
on the 12th of December 1991, firmly established the responsibility
with the pilot for aircraft collision avoidance outside controlled
airspace, and for avoiding penetration of controlled airspace. In
doing so it was a radical modification to the Australian Air
Traffic Services (AS) system.
In view of significance of the changes, the Bureau of Air Safety
Investigation (BASI) undertook an evaluation. This evaluation took
the form of the investigation of all occurrences which were deemed
to be related to the AMATS changes in a four month period from the
12th of December 1991. Additionally a questionnaire was
disseminated in the BASI Journal and deidentified CAIR reports were
used to supplement the information available.
In the four month period, 147 occurrences were categorised as
AMATS related. The Bureau received 169 questionnaires and 51 CAIR
reports.