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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. August performance (0.3 minutes median and 3.3 minutes 75th percentile) met the targets.  Compared to the same month last year, there was a decrease in the airborne delay median (from 0.5 minutes) and 75th percentile (from 3.6 minutes) performance. The long‑term 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

The following commentary describes the notable airborne delay events during August in Sydney:

12 August (1000-1100 local) – Delay 2.2 minutes

  • Decreased capacity due to:
  • Unplanned change to single runway operations from 0900-1300 local.
  • Staff unavailability.
  • Taxiway and gate congestion which increased controller workload.
  • Tactical rates were reduced by 11-13 arrivals per hour (from 34 planned) between 0900‑1300 local.

18 August (1500-1700 local) – Delay 9.0 minutes

  • Concentration of demand due to the late arrival of several compliant aircraft at the beginning of a period of single runway operations.
  • The low capacity during single runway operations did not enable these additional arrivals to be absorbed which resulted in increased airborne delay.

19 August (1000-1200 and 1700-1800 local) – Delay 12.8 minutes

  • Taxiway congestion and a short‑notice staffing unavailability resulted in a Level 2 GDP Revision at 1031 local to reduce rates from 23 to 15 per hour until 1300 local.
  • Concentration of demand in the evening due to late non‑compliant flights during an extended period of single runway operations.
  • The low capacity during single runway operations did not enable this concentration to be absorbed which resulted in increased airborne delay.

 

21 August (1700-1900 local) – Delay 6.8 minutes

  • Concentration of demand in the evening due to late non‑compliant flights during an extended period of single runway operations.
  • The low capacity during single runway operations did not enable this concentration to be absorbed which resulted in increased airborne delay.

24 August (0700-0800 local) – Delay 3.1 minutes

  • Concentration of demand due to off‑schedule international arrivals during a peak period.

27 August (0600-0900 local) – Delay 3.1 minutes

  • Concentration of demand due to off‑schedule international arrivals and late‑non compliant aircraft during the morning peak period.
  • Poor visibility in the morning extended longer than forecast. Additional staffing breaks were required to accommodate increased controller workload in this period. As a result the tactical arrival rate was lowered from 42 to 32 from 0900‑1000 local.