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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. September performance for the median (1.5 minutes) and the 75th percentile (5.5 minutes) did not meet the targets. Compared to the same month last year, there was an increase in the airborne delay performance for the median (from 1.0 minutes) and 75th percentile (from 4.4 minutes)

The long‑term (48-month) trend for airborne delay at Melbourne is upwards.

melbourne-airborne-delay

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

Notable events

Table 4 describes the notable airborne delay events during September in Melbourne. Any delay figures marked with an asterisk in the table indicates that the arrival rate reduction required for the Rapid Exit Taxiway F works was a contributing factor to the delay event. Eight of the thirteen events had the taxiway works as a contributing factor. Collaborative decision making with our airline customers about the impact of these works on network performance has resulted in an increased tolerance for Airborne Delay for arrivals into Melbourne rather taking higher levels of ground holding. The works are anticipated to be completed in early 2020 with a break over the Christmas period to avoid disruption during the busy holiday period. Co-ordination group meetings with airlines and airports decided to monitor the situation each month to determine if any further controlling actions are required to manage delay. GDP intervention to reduce airborne delays by absorbing more gate delay was offered, and through a collaborative process not implemented on two days (September 11 and 20), with a decision to accept the elevated airborne delay.

Day Local Time Delay

(minutes – 75th percentile)

Event Descriptions

(Contributing causes to increased delays)

2 September 19-20 6.5 * Extended period of unplanned single runway operations.
4 September 18-19 4.1 Forecast showers and low cloud. Concentration of demand due to non-compliant flights.
5 September 16-18 9.0 * Extended period of planned single runway operations. Forecast showers and low cloud. Concentration of demand due to non-compliant flights.
6 September 18-20 7.0 Winds, conditions different to forecast leading to single runway operations.
11 September 18-20 7.8 * Variable conditions led to an extended period of unplanned single runway operations.
12 September 08-09 9.6 * Extended period of planned single runway operations. Concentration of demand due to off-schedule internationals.
19 September 08-10 &
17-23
18.2 * Morning: Extended period of planned single runway operations with strong and gusty winds. Afternoon: Extended period of planned single runway operations with strong and gusty winds. Concentration of demand due to non-compliant flights.
20 September 07-22 26.5 * Extended period of planned single runway operations with turbulence, strong and gusty winds. Concentration of demand due to non-compliant flights.
21 September 11-12 &
15-16
7.8 * Morning: Extended period of planned single runway operations with showers. Afternoon: conditions different to forecast leading to continued use of runway 34. Extended period of planned single runway operations with showers.
25 September 18-19 4.7 Concentration of demand due to non-compliant flights.
27 September 08-12 &
17-20
17.9 * Morning: Extended period of planned single runway operations. Afternoon: Concentration of demand due to knock-on of earlier delays and non-compliant flights.
29 September 7.3 Concentration of demand due to non-compliant flights. Showers and low cloud.
30 September 18-20 7.5 Concentration of demand due to non-compliant flights.

Table 4: Notable event descriptions for Melbourne.