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ATM network performance: Melbourne

Airborne delay

The 75th percentile performance figures for airborne delay at Melbourne are indicated in Figure 5.

April performance (4.4 minutes) did not meet the target (3.5 minutes), and was steady with respect to the same period last year. The long-term trend for airborne delay at Melbourne is upwards.

Click image to enlarge

Notable events

5 April (0700-0900 Local)

  • Increased airborne delay was experienced during the morning peak period.
  • A number of late-presenting international flights concentrated demand during a busy period where rates were low to account for low cloud. A Level 3 GDP Revision was undertaken to ease demand and alleviate the built up delay.

6 April (1800-2000 Local)

  • Increased airborne delay was experienced during the evening peak period.
  • A number of late non-compliant and GDP-exempt flights concentrated demand into the busy period and resulted in increased airborne delay.

12 April (0700-0900 Local)

  • Increased airborne delay was experienced during the morning peak period.
  • The delay was caused by a series of late-notice runway changes within a 40-minute period. These changes were required due to variable wind conditions experienced throughout the day.
  • A number of conclusions can be found in the detailed Post Operational Performance Review of this event in Appendix A. In particular, the level of delay was reduced by a Level 2 GDP Revision to account for winds aloft and the cancellation of runway works to accommodate arrivals.

14 April (0800-0900 Local)

  • Increased airborne delay was experienced during the morning peak period.
  • A number of late non-compliant and GDP-exempt flights concentrated demand into the busy period and resulted in increased airborne delay.

15 April (1800-1900 Local)

  • Increased airborne delay was experienced during the evening peak period.
  • A Level 2 GDP Revision was undertaken due to a concentration of demand observed for this period. The revision limited the extent and duration of airborne delay experienced.

16 April (0900-1000 Local)

  • Increased airborne delay was experienced during the morning peak period.
  • A number of late non-compliant and GDP-exempt flights shifted demand and resulted in delay. A missed approach also occurred in this period. These factors both contributed to the increased airborne delay.

21 April (0800-1000 Local)

  • Increased airborne delay was experienced during the morning peak period.
  • Worse than forecast fog in the early morning was compounded by six missed approaches and three diversions.
  • A Level 2 GDP Revision was undertaken due to the missed approaches and increasing delay.

23 April (1000-1200 Local)

  • Increased airborne delay was experienced during the late morning.
  • Morning fog was worse than forecast. A Level 1 GDP Revision was undertaken to lower rates and realign demand.
  • The fog persisted longer than anticipated, requiring rates to remain lowered until mid-morning. This concentrated demand into the late morning resulting in airborne delay.

24 April (0700-0900)

  • Increased airborne delay was experienced during the morning peak period.
  • A small number of late-presenting flights concentrated demand to the busy period and resulted in increased airborne delay.

27 April (0800-0900)

  • Increased airborne delay was experienced during the morning peak period.
  • A small number of late-presenting flights concentrated demand into the busy period and resulted in increased airborne delay.