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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.

May Performance (1.2 minutes median and 4.2 minutes 75th percentile) did not meet the targets and delay increased with respect to the same period last year (0.8 minutes median and 3.6 minutes 75th percentile). The long-term trend for airborne delay at Melbourne is upwards.

There was one Level 2 GDP Revision (14 May) and three Level 1 GDP Revisions (03 May, 04 May and 18 May). Tactical releases were also given on 08 May and 09 May.

Figure 5: Melbourne Airborne Delay 75th Percentile

Click image to enlarge

Notable events

02 May (0800-0900 Local)

  • LAHSO was planned but could not be used due to wind being different to the forecast. A GDP revision was not an option as the affected aircraft were already airborne.

03 May (0800-0900 & 1800-2000 Local)

  • Exempt, early and late non-compliant aircraft concentrated demand leading into a busy period, leading to demand greater than capacity.
  • A Level 1 GDP Revision was run to manage the elevated delays. A Post Operational Performance Review summary is provided below and the full report can also be found in Appendix A.

07 May (0800-0900 & 1100-1200 Local)

  • Exempt, early and late non-compliant aircraft concentrated demand leading into busy periods.

10 May (1900-2000 Local)

  • A small number of flights presented late and concentrated demand to the busy period.

11 May (0700-0900 & 1500-1800 Local)

  • Multiple MEDEVAC aircraft arriving at Essendon and multiple go arounds at Melbourne led to increased airborne delay. A Level 3 GDP Revision was run in the evening due to airborne delay reaching 22 minutes and taxi delay reaching 15 minutes.

14 May (0700-0900 Local)

  • Fog persisted for 3 hours, meaning a low arrival rate of 15 per hour (vice a typical rate of 24). This was one hour longer than forecast, which lead to increased delays
  • A Level 2 GDP Revision was run at 0715L to mitigate the airborne delay.

17 May (1900-2000 Local)

  • Reduced evening arrival rates due to an un-forecast reduction in cloud base caused elevated delays.
  • Tactical rates were reduced between 8-16 arrivals for 5 hours (1500-1900) from what was planned. A constant rate of 24 was used for the period.

23 May (0800-0900 Local)

  • Tactical rates lower than planned rates were run for 0600 & 0700 due to lower than forecast cloud base.
  • The rates were reduced from 23 to 20 for 0600 and 0700. This caused elevated delays in the subsequent hours. Delays reached up to 20 minutes.