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ATM network performance: Melbourne

Airborne delay

The 75th percentile performance figures for airborne delay at Melbourne are indicated in
Figure 6. November performance for the median (2.1 minutes) and the 75th percentile (6.4 minutes) did not meet the targets. Compared to the same month last year, there was an increase in the airborne delay median performance (from 1.6 minutes) and 75th percentile performance (from 5.6 minutes).

The long‑term (48-month) trend for airborne delay at Melbourne is upwards. However, the 24- month trend is flat.

Figure 6: Melbourne airborne delay 75th percentile (last 24 months)

Click image to enlarge

Notable events

Day Local Time Delay

(minutes – 75th percentile)

Event Descriptions

(Contributing causes to increased delays)

02 November 08-22 13.5 Weather deviations and missed approaches due to thunderstorm and strong winds in the morning resulted in elevated airborne delay. Further build-up of delay in afternoon following an extended low‑capacity period (single runway operations).
06 November 07-09 10.7 Missed approaches and period of reduced landings in the morning due to thunderstorm. Level 2 GDP Revision with rates unchanged.
09 November 18-20 5.4 Reduced capacity due to worse than forecast wind conditions in the evening (tactical rates lowered).
13 November 18 & 21 7.7 Late non-compliant and off-schedule international flights concentrated demand for two short periods.
14 November 18-19 8.0 Reduced capacity in the evening due to low cloud for longer than forecast. Level 2 GDP Revision with rates reduced.
15 November 18-19 5.1 Build-up of delay in afternoon following an extended low‑capacity period (single runway operations).
16 November 14-17 10.2 Concentration of demand due to late non-complaint flights and compliant flights with longer than anticipated flight times at the beginning of a low-capacity period (single runway operations).
18 November 18-19 6.1 Concentration of demand due to late non-complaint flights and compliant flights with longer than anticipated flight times during a low-capacity period (single runway operations).
19 November 18-19 8.9 Concentration of demand due to late non-complaint flights and compliant flights with longer than anticipated flight times during a low-capacity period (single runway operations).
20 November 16-20 11.1 Reduced capacity in the afternoon due to a thunderstorm with limited arrivals for 40 minutes. Recovery hindered by runway change with tactical rates reduced.
22 November 15-17 5.2 Concentration of demand due to late non-compliant departures and flights that experienced departure delays in Sydney.
23 November 10-11 6.1 Concentration of demand due to off-schedule international flights and flights that experienced departure delays in Sydney.
25 November 18-19 6.0 Concentration of demand due to flights with longer than anticipated flight times during busy period.
26 November 08-11 8.8 Concentrated demand due to reduced capacity at the beginning of the morning peak. Tactical rates reduced due to low cloud.
27 November 18-19 5.4 Concentration of demand due to off-schedule internationals and domestic flights that took-off more than 10 minutes later than planned.
29 November 8-12

&

18-19

14.6 Concentration of demand in the morning due to diversions from Essendon during a low-capacity period (single runway operations).

Concentration of demand in the afternoon due to late non‑compliant flights, a missed approach and a medical emergency during a low-capacity period (single runway operations).

30 November 7-11

&

18-21

11.9 Concentration of demand due to longer than anticipated flight times at the beginning of a low-capacity period (due to low cloud).

Concentration of demand due to late non‑compliant flights during a low-capacity period (single runway operations).