Loss of separation involving a Boeing 737-376, VH-TJD and Boeing 737-476, VH-TJL, 20 km east-south-east of Rugby, New South Wales, on 6 November 1993

Both aircraft were inbound to Sydney on different but converging routes, cruising at the same level. The Sydney Flow Controller requested that VH-TJL be positioned 15NM behind VH-TJD to facilitate their arrival. The controller responsible for the aircraft instructed VH-TJD to turn right (to place it on the same track as VH-TJL) and to descend. As VH-TJD converged on the track flown by VH-TJL the required lateral separation of 5NM was lost before the required vertical separation was achieved.