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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. November performance for the median (2.1 minutes) and the 75th percentile (6.1 minutes) did not meet the targets. Compared to the same month last year, the median remained unchanged, and there was a decrease in the 75th percentile (from 6.4 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 November 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 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 Event Category Delay
(minutes – 75th percentile)
Event Descriptions
(Contributing causes to increased delays)
1 November Significant 15.2 * Morning: Extended period of single runway operations. In addition, there was a concentration of demand due to off-schedule internationals and non-compliant flights.

Afternoon: Extended period of single runway operations. In addition, there was a concentration of demand due to off-schedule internationals and non-compliant flights.

2 November Significant 14.4 * Morning: Tactical rates were reduced from planned due to thunderstorm activity and heavy showers. Extended period of single runway operations with un-forecast use of runway 34.

Afternoon: Extended period of single runway operations with un-forecast use of runway 34. In addition, there was a concentration of demand due to non-compliant flights.

3 November Notable 6.8 Morning: Fog, un-forecast use of Runway 16 for arrivals (planned Runway 34).
6 November Significant 8.8 * Afternoon: Extended period of single runway operations with Taxiway E unavailable in addition to Taxiway F. A level 1 revision was conducted at 1400 local to reduce the rates.
11 November Significant 9.7 * Morning: Concentration of demand due to non-compliant flights. In addition, there was a concentration of demand due to off-schedule internationals.
25 November Notable 7.0 * Afternoon: Extended period of single runway operations with un-forecast use of runway 34. In addition, there was a concentration of demand due to non-compliant flights.
29 November Significant 13.5 * Morning: Single runway arrivals with forecast low cloud reducing rates. In addition, there was a concentration of demand due to off-schedule internationals and non-compliant flights with strong winds impacting the airport.

Afternoon: Extended period of single runway operations which occurred earlier than expected reducing rates for several hours. In addition, there was a concentration of demand due to non-compliant flights with showers impacting the airport.

Table 3: Distinctive event descriptions for Melbourne.