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ATM network performance: Sydney

Airborne delay

The 75th percentile performance figures for airborne delay at Sydney are indicated in Figure 4.

April performance (3.1 minutes) met the target (3.5 minutes). However, delay was higher than during the same period last year (2.5 minutes). The long-term trend for airborne delay at Sydney is upwards.

Figure 4: Sydney Airborne Delay 75th Percentile

Click image to enlarge

Notable events

25 April (1800-1900 Local)

  • Worse than forecast weather conditions resulted in acceptance rate reductions of four aircraft
    an hour during the afternoon and early evening.
  • This decreased capacity resulted in an increase airborne delay during the peak evening period.

27 April (0600-0800 Local)

  • Worse than forecast weather conditions in the morning resulted in a Level 2 GDP Revision.
    Acceptance rates were reduced by between six and 10 aircraft for the first three hours of the
    morning.
  • A number of GDP-exempt, early and late non-compliant flights also concentrated demand into this
    period.
  • The combination of lowered rates and off-schedule flights resulted in increased airborne delay
    during the morning peak period.

28 April (0600-0800 Local)

  • Increased airborne delay was experienced in the morning peak period.
  • A number of GDP-exempt, early and late non-compliant flights concentrated demand into the busy period resulting in increased airborne delay.
  • Delays were further compounded by two medical emergency flights in this period.

30 April (0600-0900 Local)

  • Precision Runway Monitor (PRM) was unavailable during the morning period due to staff unavailability. This reduced capacity and resulted in increased airborne delay during the morning peak period.
  • A number of GDP-exempt, early and late non-compliant flights also concentrated demand into this period which exacerbated the delay.