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ATM network performance: Melbourne

Airborne delay

The 75th percentile performance figures for airborne delay at Melbourne are indicated in
Figure 7. January performance for the median (1.1 minutes) and the 75th percentile (4.6 minutes) did not meet the targets. Compared to the same month last year, there was a decrease in the airborne delay median performance (from 1.2 minutes) and 75th percentile performance (from 5.0 minutes).

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

Figure 7: 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)

03

January

07-08 3.4 Concentration in demand due to off-schedule international flights during morning peak period.
04

January

16-21 11.0 Reduced capacity due to strong winds resulting in runway change and numerous missed approaches. Level 2 GDP Revision at 1739L due to increasing airborne delay (rates unchanged).
07

January

07-08 3.7 Reduced capacity in morning due to unfavourable wind conditions. Single runway operations commenced earlier than planned (tactical rates reduced).
08

January

07-08 3.7 Reduced capacity due to low cloud during morning peak period (tactical rates reduced).
11

January

18-19 5.2 Build-up of delay in afternoon following an extended low‑capacity period (single runway operations).
17

January

14-16 6.2 Reduced capacity due to squall passing through TMA resulting in numerous missed approaches.
18

January

18-21 12.1 Reduced capacity due to low cloud and storms in the early evening (tactical rates lowered).
21

January

15-16 9.1 Concentration of demand due to late non‑compliant flights during a period of low capacity (single runway operations).
22

January

07-08 4.7 Concentration in demand due to off-schedule international and late non‑compliant flights during morning peak period.
23

January

10-11

&

18-20

8.8 Reduced capacity due to unfavourable wind conditions.  Single runway operations continued for longer than planned (tactical rates reduced).
25

January

07-09

&

15-16

10.1 Concentration in demand due to off-schedule international flights during morning peak period.

 

Reduced capacity due to strong winds resulting in numerous missed approaches during afternoon. Level 2 GDP Revision at 1522L (rates unchanged).

 

29

January

17-20 7.7 Reduced capacity due to strong winds resulting in numerous missed approaches.
30

January *

17-23 6.9 Reduced capacity due to thunderstorms in late afternoon resulted in four periods with few to no successful approaches. Level 3 GDP Revisions were conducted at 1800L (rates reduced) and 2110L (rates unchanged from first revision).