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ATM network performance: Sydney

Airborne delay

The 75th percentile performance figures for airborne delay at Sydney are indicated in Figure 5. December performance met the target for the median (0.5 minutes) and did not meet the target for the 75th percentile (4.3 minutes). Compared to the same month last year, there was an increase in the airborne delay median performance (from 0.4 minutes) and 75th percentile performance (from 2.9 minutes).

The long‑term (48-month) trend for airborne delay at Sydney is upwards. However, the 24‑month trend is flat.

Figure 5: Sydney 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)

02 December 19-20 8.7 Concentration of demand due to off‑schedule internationals and late non‑compliant flights during evening peak period.
04 December 19-20 6.5 Reduced capacity due to an aircraft requiring return for safety issue.
05 December 09-11 7.5 Reduced capacity due to low cloud persisting longer than forecast (tactical rates reduced).
06 December 07-08 3.4 Reduced capacity due to low cloud persisting longer than forecast (tactical rates reduced).
10

December

07-11 12.9 Reduced capacity due to low cloud persisting longer than forecast. Level 2 GDP Revision with rates reduced.
11 December 07-10 9.8 Concentration of demand due to off‑schedule international flights during morning peak period.
12 December 07-12 11.4 Reduced capacity due to low cloud persisting longer than forecast (tactical rates reduced).
13 December 19-22 7.0 Diversions for thunderstorms and military airspace restrictions in the early evening. Level 3 GDP Revision (Ground Stop) at 1900L due to heavy storms. Only three arrivals in 20L hour.
14 December 09-13 &

15-20

14.0 Level 2 GDP Revision in morning due to persistent low cloud and increased thunderstorm risk.

Thunderstorms in afternoon and evening resulted in increased traffic due to flights diverting to Sydney from nearby airports. Level 3 GDP Revision (Ground Stop) at 1600L due to increasing airborne delay.

16 December 19-20 3.7 Reduced capacity due to thunderstorm during evening peak period.
18 December 07-09

&

18

7.5 Concentration of demand due to off‑schedule international flights during morning peak period.

Concentration of demand due to late non-complaint flights during evening peak period.

19 December 18-21 5.7 Reduced capacity due to thunderstorm and runway changes during evening peak period.
20 December 17-22 9.7 Reduced capacity due to thunderstorms in the late afternoon and evening. Several periods of significantly reduced arrivals led to a Level 2 GDP Revision and a Level 3 GDP Revision.
21 December 09-11 6.4 Reduced capacity in morning due to Precision Runway Monitor not available (tactical rates reduced).
22 December 09-12 8.9 Reduced capacity in the morning due to tower staffing constraints (tactical rates reduced).