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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. January performance for the median (2.2 minutes) and the 75th percentile (7.1 minutes) did not meet the targets. Compared to the same month last year, there was an increase in the airborne delay median performance (1.1 minutes), and in the 75th percentile performance (from 4.6 minutes).

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

Melbourne airborne delay

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

Distinctive events

Table 3 describes the distinctive events during January in Melbourne.

Any events 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. 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 February 2020 with a break taking place over the Christmas period (up to January 13) to avoid disruption during the busy holiday period. Co-ordination group meetings with airlines and airports resulted in the decision to monitor the situation each month to determine if any further controlling actions are required to manage delay.

Day Event Category Delay
(minutes – 75th percentile)
Event Descriptions
(Contributing causes to increased delays)
3 January Significant 11.1 Afternoon: Rates reduced tactically due to smoke haze and switch to single runway operations with concentration of demand due to off-schedule internationals and non-compliant flights.
6 January Significant 10.3 Afternoon: Smoke haze with concentration of demand due to off-schedule internationals and non-compliant flights.
9 January 4.5 Afternoon: Smoke haze, two go-arounds, concentration of demand due to off-schedule internationals and non-compliant flights.
10 January Significant 11.9 Morning: Rates reduced tactically due to poor weather conditions (low level winds, turbulence and windshear) continuing longer than forecast during period of single runway operations. Concentration of demand due to off-schedule internationals.

Afternoon: Rates reduced tactically due to poor weather conditions (low level winds, low cloud and turbulence) continuing longer than forecast during period of single runway operations. Concentration of demand due to off-schedule internationals and non-compliant flights.

13 January Significant 42.0 Morning: Rates reduced tactically due to un-forecast low visibility (smoke haze) during period of single runway operations. Combined Melbourne and Essendon sequencing.

Afternoon: Rates reduced tactically due to un-forecast low visibility (smoke haze).and un-forecast single runway operations. Concentration of demand due to off-schedule internationals. Level 2 revision conducted at 1540 local.

14 January Significant 22.0 Morning: Smoke haze with concentration of demand due to off-schedule internationals during period of single runway operations.

Afternoon: Smoke haze with concentration of demand due to off-schedule internationals and non-compliant flights during period of single runway operations. An emergency flight, fire-fighting flights and combined Melbourne and Essendon sequencing.

15 January Significant 23.5 * Morning: Rates reduced tactically due to smoke haze with concentration of demand due to off-schedule internationals and non-compliant flights during period of single runway operations.

Midday: Smoke haze with concentration of demand due to off-schedule internationals and non-compliant flights during period of single runway operations.

Afternoon: Thunderstorm with concentration of demand due to non-compliant flights during period of single runway operations. Ground stop at 1630 local, with no landings from about 1620 until 1800 local, with 3 go-arounds after recommencement of landings. Level 2 revision at 1800 local. Following this rates reduced tactically due to smoke haze.

19 January Significant 11.3 Afternoon: Thunderstorms in the terminal area with concentration of demand due to off-schedule internationals and non-compliant flights during period of single runway operations.
20 January Significant 12.5 Morning: Low cloud and showers with concentration of demand due to off-schedule internationals and non-compliant flights.

Afternoon: Reduced visibility due to low cloud with concentration of demand due to off-schedule internationals and non-compliant flights during a period with single runway operations.

22 January Significant 16.3 * Morning: Concentration of demand due to off-schedule internationals and non-compliant flights during a period of single runway operations.

Afternoon: Rates reduced tactically due to strong and gusty winds with turbulence and windshear with concentration of demand due to off-schedule internationals and non-compliant flights during a period of single runway operations. Several missed approaches and a runway change.

23 January Significant 10.5 * Morning: Varying weather (including showers) with concentration of demand due to off-schedule internationals during a period of single runway operations.

Afternoon: Taxiway E not available to heavy aircraft. Concentration of demand due to off-schedule internationals and non-compliant flights.

24 January Significant 5.4 * Afternoon: Un-forecast change to single runway operations with strong winds with concentration of demand due to non-compliant flights. Several aircraft were tactically released before a change to single runway operations which increased delay.
27 January Notable 3.7 Afternoon: Rates reduced tactically due to different runway configuration than forecast with low visibility with concentration of demand due to off-schedule internationals and non-compliant flights. The period included a runway change.
31 January Significant 8.7 * Morning: Concentration of demand due to off-schedule internationals during period of single runway operations.

Afternoon: Concentration of demand due to non-compliant flights during period of single runway operations. Windshear lead to two go-arounds.

Table 3: Distinctive event descriptions for Melbourne.