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ATM network performance: Sydney

Airborne delay

The 75th percentile performance figures for airborne delay at Sydney are indicated in Figure 8. March performance for the median (1.3 minutes) and the 75th percentile (5.1 minutes) did not meet the targets. Compared to the same month last year, there was an increase in the airborne delay median performance (from 0.8 minutes) and 75th percentile performance (from 4.3 minutes).

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

syndey-airborne-delays

Figure 8: Sydney airborne delay 75th percentile (last 24 months)

Notable events

Table 2 describes the notable airborne delay and other events during March in Sydney.

Day Local Time Delay

(minutes – 75th percentile)

Event Descriptions

(Contributing causes to increased delays)

05 March 07-08 3.0 Concentration in demand due to off-schedule international flights during morning peak period.
06 March 15-16 6.1 Reduced capacity in mid-afternoon due to thunderstorms and strong winds.
07 March 07-09 7.1 Reduced capacity during morning peak period due to strong winds. Tactical rates reduced.
09 March 08-09 5.4 Reduced capacity during morning peak period due to strong winds. Tactical rates reduced.
13 March 07-08 &

18-19

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

Concentration in demand in the peak evening period due to longer than anticipated flight times.

14 March 07-09 &

15-22

16.4 Reduced capacity in the morning due to heavy showers. Tactical rates reduced.

Reduced capacity in the afternoon and evening due to multiple thunderstorms. Level 1 GDP Revision at 1600L with rates reduced.

15 March 08-09 5.9 Concentration in demand due to late non‑compliant and off-schedule internationals flights during morning peak period.
16 March 07-11 15.4 Reduced capacity in the morning peak period due to thunderstorms. Level 1 GDP Revision at 0945L to extend the GDP until 1300L (rates reduced).
17 March 18-20 9.5 Concentration of demand during the evening peak period due to late non-compliant flights.
19 March 18-19 8.8 Reduced capacity during the evening peak period due to heavy showers. Tactical rates reduced.
21 March 07-10 9.0 Reduced capacity in the morning peak period due to low cloud and heavy showers. Tactical rates reduced.
22 March 07-10 &

18-19

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

Reduced capacity during the evening peak period due to heavy showers. Tactical rates reduced.

23 March 10-11 4.1 Reduced capacity due AUSCAL operations. Tactical rates reduced.
24 March 13-15 10.0 Concentration of demand due to late non-compliant and medical flights during a period of reduced capacity (low rates due to AUSCAL operations).
27 March 08-09 6.6 Concentration in demand due to off-schedule international flights during morning peak period.
29 March 12-13 4.2 Reduced capacity due to Sydney tower evacuation in response to fire alarm. Tactical rates reduced while tower staff relocated. A ground stop for flights to Sydney was implemented at 1048L. Level 3 GDP Revision was conducted at 1155L with rates reduced. A Level 1 GDP Revision was conducted at 1325 to increase rates back to original capacity.
30 March 17-18 5.5 Concentration due late non-compliant during low capacity period (extended single runway operations).

Table 2: Notable event descriptions for Sydney.