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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. July performance for the median (1.8 minutes) and the 75th percentile (6.6 minutes) did not meet the targets. Compared to the same month last year, there was a decrease in the airborne delay median performance (from 1.9 minutes) and increase in the 75th percentile (from 5.6 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 July 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. Only one delay event did not have 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.

Day Local Time Delay

(minutes – 75th percentile)

Event Descriptions

(Contributing causes to increased delays)

1 July 16-21 19.5* Increased delays due to extended period of constrained single runway operations due to rapid exit taxiway F unavailability (long term works).
2 July 08-10 4.5* Reduced rates due to taxiway F closure impacting operations.
3 July 18-20 4.6 Non-compliant flights causing concentration of demand.
4 July 11-12 4.4* Off-schedule internationals and non-compliant flights causing concentration of demand compounded by reduced rates due to taxiway F closure.
5 July 11-13 &

15-16

4.0* 11-13L: Late non-compliant flights during extended period of constrained single runway operations.

15-16L: Late non-compliant flights during extended period of constrained single runway operations.   LAHSO commenced at 1521 which reduced the accumulated delay.

7 July 17-21 9.3* Level 1 revision at 1600L revised down the planned LAHSO rates from 30 to 20 during the evening peak. Non-compliant flights during extended period of constrained single runway operations.
10 July 07-12 &

17-23

30.2* Morning and Evening: Off-schedule internationals and late non-compliant flights during extended period of constrained single runway operations due to taxiway unavailability. Evening: earlier than forecast weather front (strong winds), multiple go-arounds due to windshear. Some flights did not land until after midnight.
11 July 08-10

&

15-18

17.5* Morning: off-schedule internationals during extended period of single runway operations with different than forecast wind direction, strong wind gusts and taxiway unavailability. Afternoon: Off-schedule internationals and non-compliant flights during extended period of single runway operations with runway change, passing showers delayed start of LAHSO operations. Level 2 GDP with 30 minute ground stop conducted at 1810.
12 July 08-12

&

18-21

19.3* Morning: Off-schedule internationals and non-compliant flights during extended period of constrained single runway operations.

Evening: Off-schedule internationals and non-compliant flights during extended period of single runway operations.

 

14 July 16-21 12.0* Non-compliant flights during extended period of constrained single runway operations with periods of reduced visibility during the evening peak.
16 July 08-09 4.2* Level 1 revision at 0630 local due to low cloud and change in weather conditions with slight lowering of rates for single runway operations. Off-schedule internationals and non-compliant flights during extended period of single runway operations.
18 July 18-19 6.7* Level 2 revision at 1745 local. Off-schedule internationals and non-compliant flights during extended period of single runway operations.
20 July 08-09, 11-12 & 16-17 10.4* Close to full program for most of the day. Off-schedule internationals and non-compliant flights during extended period of single runway operations with strong and gusty winds and taxiway closure.
22 July 07-12

&

16-22

21.7* Close to full program for most of the day. Strong winds with multiple go-arounds. Off-schedule internationals and non-compliant flights during extended period of single runway operations.
23 July 18-20 5.7* Runway change with strong winds. Extended period of single runway operations.
25 July 07-08

&

11-12

5.0* Morning: Low cloud stopped LAHSO operations.

Late morning: Off-schedule internationals and non-compliant flights during extended period of single runway operations.

26 July 07-10

&

16-21

18.7* Morning: Off-schedule internationals and non-compliant flights during extended period of single runway operations with forecast low cloud.

Evening: Returned emergency flight and taxiway unavailable.

Table 4: Notable event descriptions for Melbourne.