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ATM network performance: Sydney

ATM Network Performance: Sydney

Airborne delay

The 75th percentile performance figures for airborne delay at Sydney are indicated in Figure 8. September performance for the median (1.4 minutes) and the 75th percentile (6.2 minutes) did not meet the targets (0.5 minutes and 3.4 minutes respectively). Compared to the same month last year, there was an increase in the airborne delay performance for the median (from 0.5 minutes) and 75th percentile (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)

Notable events

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

Day Local Time Delay

(minutes – 75th percentile)

Event Descriptions

(Contributing causes to increased delays)

5 September 05-07 2.8 Concentration of demand due to off-schedule internationals.
6 September 07-09 &
18-22
15.9 Morning: Tactical rates reduced from plan due to low cloud.

Afternoon: Concentration of demand due to off-schedule internationals and non-compliant flights during extended period of planned single runway operations, compounded by further reduced tactical rates due to strong winds.

7 September 09-19 17.5 Extended period of planned single runway operations with strong and varying winds. Some concentration of demand due to off-schedule internationals and non-compliant flights.
8 September 08-10 4.4 Concentration of demand due to off-schedule internationals and non-compliant flights during extended period of planned single runway operations with strong winds. Level 1 revision performed at 1215 local to increase tactical rates for the afternoon.
9 September 08-11 &
17-20
16.7 Morning: Extended period of planned single runway operations, further reduction in tactical rates due to strong winds, wind shear and showers. Some concentration of demand due to off-schedule internationals and non-compliant flights.

Afternoon: Diversions in circuit due turbulence and winds. Concentration of demand due to off-schedule internationals and non-compliant flights.

10 September 08-09 5.4 Strong headwinds on final reduced tactical rates. Concentration of demand due to off-schedule internationals. Two medical emergencies also sequenced during this period
13 September 07-10 6.4 Reduced tactical rates to manage breaks for PRM staff. Concentration of demand due to off-schedule internationals.
14 September 07-09 5.9 Management of late notice unavailability of tower staff member required lowering of tactical rates. Low cloud conditions. Concentration of demand due to off-schedule internationals.
16 September 17-20 8.8 Weather caused diversions in the TMA and led to a reduction in the tactical arrival rate.
17 September 06-10 &
17-21
23.0 Morning: Strong head winds on final and poor visibility led to a reduction in the tactical rate. Weather diversions in the circuit plus an emergency flight also led to increases in delays experienced.

Afternoon: Strong head winds on final led to a reduction in the tactical rate and consequential elevated delays.

18 September 06-10 &
18-19
13.4 Morning: Level 2 revision due to worse than forecast conditions at 0745 local. Multiple go-arounds, strong winds and low cloud, concentration of demand due to off-schedule internationals. Afternoon: Level 1 revision due to worse than forecast conditions at 1600 local, low cloud and showers with weather diversions. Concentration of demand due to off-schedule internationals and non-compliant flights.
20 September 18-20 9.1 Lower than forecast cloud was experienced with substantial reductions in the tactical rate. Similar conditions were experience in Melbourne which had a consequential impact on returning flights.
21 September 06-07 &
13-14
8.2 Morning: Flights due to land prior to curfew end absorbed delay. Concentration of demand due to off-schedule internationals. Afternoon: low cloud, showers and winds.
23 September 17-19 6.8 Emergency flight, strong and gusty winds. Level 2 revision due to weather conditions different to forecast to provide single runway rates at 1710 local.
27 September 05-08 2.9 Flights due to land prior to curfew end absorbed delay. Concentration of demand due to off-schedule internationals and late departures out of Melbourne.
30 September 06-08 &
18-19
8.1 Morning: Flights due to land prior to curfew end absorbed delay. Concentration of demand due to off-schedule internationals. Afternoon: lower cloud than forecast, concentration of demand due to non-compliant flights.

Table 2: Notable event descriptions for Sydney.