Performance of Air Traffic Management

Air navigation delays in minutes

ATM delays for which an Air Navigation Service Provider (ANSP) is solely accountable for are known as CRSTMP, they encompass delays generated in DSNA’s en-route & terminal areas and address the following areas of concern:

• ATC Capacity (C): delays due to traffic demand exceeding declared or expected ATC capacity.
• ATC Routeings (R): delays due to network solutions/scenarios used to balance traffic demand and capacity
• ATC Staffing (S): delays due to unplanned staff shortage reducing expected capacity.
• ATC Equipment (T): delays due to the non-availability or degradation of equipment used to provide an ATC service and reducing expected or declared capacity due
• Airspace Management (M): delays following changes in airspace/route availability due to small scale military activity and reducing expected or declared capacity.
• Special Event (P): delays due to major sporting, governmental or social event and reducing planned, declared or expected capacity. Special events induced delays may also concern ATM system upgrades and transitions. Large multi-national military exercises may also use this reason.

Flight efficiency indicators

3 Dimensional Indicator

The 3-dimensional “3D indicator” measures the difference in percentage between the actual 3D flown flight trajectories and the optimal trajectories. This value takes into account :

• Distance flown outside a circle of 10 Nm around the airports
• Vertical inefficiencies due to the different phases flown by an aircraft (climb, cruise & descent),
• Horizontal inefficiencies due to the difference between the horizontal projection of the trajectories and the great circle distances,

Inefficiencies due to the mandatory handover procedures with other air traffic control service providers (coordination points to be used, flight level allocation to be applied).

Key Performance Environmental Indicator – Based on actual trajectories - KEA

The “KEA indicator” is computed to evaluate the average horizontal en route flight efficiency of the actual trajectory, taking into account the following :

• Distance flown outside a circle of 40 Nm around the airports
• Difference between the actual trajectories and the great circle distances

Key Performance Environmental Indicator – Based on the last filed flight plan - KEP

The “KEP indicator” is computed to evaluate the average horizontal en route flight efficiency of the last filed flight plan trajectory, taking into account the following :

• Distance flown outside a circle of 40 Nm around the airports
• Difference between the last filed flight plan trajectories and the great circle distance