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ATM network performance: Melbourne

Airborne delay

The 75th percentile performance figures for airborne delay at Melbourne are indicated in Figure 9.

March performance for the median (1.5 minutes) and the 75th percentile (5.3 minutes) did not meet the targets. Compared to the same month last year, there was an increase in the airborne delay median performance (from 1.0 minutes) and 75th percentile performance (from 4.4 minutes).

The long‑term (48-month) and 24-month trends for airborne delay at Melbourne are upwards.

melbourne-airborne-delays

Figure 9: Melbourne airborne delay 75th percentile (last 24 months)

Notable events

Table 4 describes the notable airborne delay events during March in Melbourne.

Day Local Time Delay

(minutes – 75th percentile)

Event Descriptions

(Contributing causes to increased delays)

01 March 10-12 &

16-20

16.2 Concentration of demand in the late morning due to late non-compliant and off schedule international flights during a low capacity period (extended single runway operations).

Reduced capacity in the afternoon and evening due to thunderstorms. Tactical rates reduced at 1700L and Level 2 GDP Revision at 1935Lwith rates reduced.

05 March 18-19 4.6 Increased delay in the peak evening period due to deviations around thunderstorms.
07 March 18-19 4.2 Concentration of demand due to late non-compliant flights and reduced capacity due to single runway operations extending longer than planned.
15 March 18-19 7.8 Concentration of demand due to late non-compliant flights during low capacity period (single runway operations).
17 March 08-09 &

18-19

6.6 Reduced capacity in peak morning period due to fog. Tactical rates reduced.

Concentration of demand during the peak evening period due to late non-compliant flights.

18 March 07-08 6.4 Concentration of demand during the peak morning period due to late non-compliant and off‑schedule international flights.
19 March 18-19 6.1 Reduced capacity during the peak evening period due low cloud. Tactical rates reduced.
20 March 11-12 &

18-19

11.1 Reduced capacity in the morning due to low cloud. Level 2 GDP Revision with rates reduced.

Reduced capacity due to single runway operations extending longer than planned.

22 March 07-10 &

16-21

19.4 Concentration of demand during morning due to late non-compliant and off-schedule international flights.

Reduced capacity in the afternoon and evening due to thunderstorms. Multiple periods with no approaches and several runway changes.

29 March 08-10 &

17-20

13.8 Concentration of demand due to off-schedule internationals during busy morning period.

Reduced capacity during evening peak period due to strong winds. Limited approaches for 25 minutes.

Table 4: Notable event descriptions for Melbourne.