Loss of separation involving Boeing 737-376, VH-TAH and Boeing 737-377, VH-TAF, 296 km north-east of Perth, Western Australia, on 11 July 1991

Circumstances:

1.1 VH-TAH

Significant Factors:

1. Incorrect flight data preparation.

2. Probable distraction from primary control function.

3. Information transfer failure relative to airway tracking data.

4. Inappropriate airway route reporting waypoints for transfer of jurisdiction purposes.

Recommendations:

The Civil Aviation Authority should give consideration to

1. reviewing all airway route structures to identify similar airways which do not have a published waypoint at airspace boundaries;

2. allocating waypoint names to all such airways; and

3. in the interim providing airway identification and a readback of that airway during co-ordination exchanges.