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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. November performance for the median (1.6 minutes) and the 75th percentile (5.9 minutes) did not meet the targets (0.6 minutes and 3.3  minutes respectively). Compared to the same month last year, there was an increase in the airborne delay median performance (from 0.7 minutes) and in 75th percentile performance (from 3.6 minutes).

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

Sydney airborne delay

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

Distinctive events

Table 1 describes the distinctive events during November in Sydney.

Day Event Category Delay
(minutes – 75th percentile)
Event Descriptions
(Contributing causes to increased delays)
1 November Significant 7.2 Tactical rates were reduced from planned due to smoke haze that reduced visibility.
8 November Significant 25.8 Afternoon: Switched to single runway mode early due to debris on runway. In addition, there was a concentration of demand due to non-compliant flights.
12 November Significant 15.5 Afternoon: Uncertainty around time of change to single runway mode. Go-arounds due to windshear. In addition, there was a concentration of demand due to off-schedule internationals and non-compliant flights.
14 November Significant 11.1 Morning: Off-schedule internationals.

Afternoon: Tactical rates were reduced from planned due to smoke haze that reduced visibility.

16 November 5.8 Morning: Eurocat operating in degraded mode resulted in airborne delay and diversions.
22 November Significant 15.9 Morning: Off-schedule internationals and non-compliant flights. Tactical rates were reduced from planned due to smoke haze that reduced visibility.

Afternoon: Thunderstorm activity resulted in a ground stop. Tactical rates were reduced from planned due to smoke haze that reduced visibility and a medical flight operation.

25 November Significant 13.0 Afternoon: Thunderstorm impacted airport with a level 2 revision run at 1730 local. Multiple go-arounds with a ground stop at 1834 local. This caused flight cancellations and curfew dispensations.
26 November Significant 17.7 Morning: Tactical rates were reduced from planned due to smoke haze that reduced visibility with strong winds deteriorating conditions further. Thunderstorms began to affect the airport region causing weather diversions. Rapid exit taxiway blocked by disabled aircraft.

Afternoon: Extended period of single runway operations following thunderstorm activity, with strong winds and a rescue flight. Approximately 30 cancelled flights.

29 November Significant 8.1 Afternoon: Tactical rates were reduced from planned due to smoke haze and low cloud that reduced visibility. In addition, windshear caused go-arounds, and there was a concentration of demand due to non-compliant flights.

Table 1: Distinctive event descriptions for Sydney.