ATFM slot adherence
|1.1 Contact organisation||EUROCONTROL: The European organisation for the safety of air navigation.|
|1.2 Contact organisation unit||Directorate Single Sky - Performance Review Unit (DSS/PRU)|
|1.3 Contact name||Performance Review Unit - EUROCONTROL|
|1.5 Contact mail address||96 Rue de la Fusée|
|1.6 Contact e-mail address||NSA-PRU-Support@eurocontrol.int|
|1.7 Contact phone number||+32 2 729 39 56|
|2. Metadata update|
|2.1. Metadata last certified||not applicable|
|2.2. Metadata last update||01 November 2016|
3. Statistical presentation
3.1. Data description
ATFM departure slots are allocated centrally by the European Network Manager upon the request of the local Flow Management Position (FMP), when an imbalance between demand and capacity is foreseen at airports and/or en-route. The purpose of such regulation is to hold aircraft on the ground.
An ATFM slot tolerance window is available to ATC to sequence departures. The standard slot tolerance window is [-5 minutes, +10 minutes]. ATC at the departure airport has a joint responsibility with aircraft operators to ensure that flights departure within the allocated ATFM slot tolerance window in order to optimise traffic flow. ATFM departure slot adherence, simply named ATFM slot adherence hereafter, measures the share of take-offs inside the slot tolerance window of [-5 minutes, +10 minutes].
ATFM slot adherence monitoring is a pre-requisite to fine tune traffic predictions at the departure, en-route airspace and at the destination airports. The higher the number of regulated departing aircraft inside the assigned ATFM standard window, the more accurate the predicted traffic and associated down-stream ATFM measures.
ATFM slot adherence monitoring is required by the Regulation (EU) No 255/2010. Under Article 11 of this regulation, the ATS units are required to provide the information regarding non-compliance to slot adherence for these airports where non-adherence equals or exceeds 20% of the regulated departures, as well as their action plans to mitigate such a non-compliance.
In application to Regulation (EU) No 255/2010, the Network Manager monitors ATFM slot adherence on a monthly basis.
The Performance Regulation (390/2013), Annex I Section 2 para 3.2(a) also require ATFM slot adherence to be monitored at local level, i.e. at national level with a breakdown at airport level.
3.2. Classification system
ATFM slot adherence is classified per Member State, with a breakdown for each airport subject to EU IR390.
3.3. Sector coverage
The measures pertain to the Air Transport and Air Traffic Management Sector of the economy.
3.4. Statistical concepts and definitions
ATFM slot adherence is defined as the percentage of departures inside an ATFM slot tolerance window of [-5 minutes, +10 minutes].
3.5. Statistical unit
The statistical unit is the airport. Airport level data is also aggregated to States.
3.6. Statistical population
3.7. Reference Area
The reference area is the Single European Sky Area of RP2 (2015-2019).
3.8. Time coverage
The Network manager has monitored slot adherence to ATFM since 2011, but in the scope of the Performance Scheme, 2015 is the first year for which data is presented.
3.9. Base period
4. Unit of measure
ATFM slot adherence is measured in percentage of outbound regulated IFR flight [% of regulated departures].
5. Reference period
As fixed by the Performance Regulation (390/2013), the second reference period (RP2) for the performance scheme shall cover the calendar years 2015 to 2019 inclusive.
6. Institutional Mandate
Legal acts and agreements are established in the Performance Regulation (390/2013).
The information is public and disseminated in accordance with Article 21 of the Performance Regulation (390/2013).
8. Release policy
8.1. Release calendar
ATFM slot adherence is released monthly with yearly aggregates.
8.2. Release calendar access
8.3. User access
Information is disseminated to the general public via the EUROCONTROL website.
9. Frequency of dissemination
Data is published monthly with the annual performance aggregate being available in January of the following year.
10. Dissemination format
The information is available on the EUROCONTROL website.
11. Accessibility of documentation
11.1. Documentation on methodology
As per the pertaining regulations (see Institutional Mandate).
For technical questions not addressed in Statistical processing please contact: NSA-PRU-Support@eurocontrol.int.
Additional definitions of the terms used in the frame of the this KPI are available in the Glossary.
11.2. Quality documentation
There is no specific documentation on procedures applied for quality management and quality assessment.
12. Quality Management
As per Performance Regulation (390/2013), Article 21 (3), "The data providers shall take the necessary measures to ensure the quality, validation and timely transmission of the data, including providing evidence of their quality checks and validation processes, explanations in response to specific requests from the Commission regarding the quality of the data and, where necessary, action plans to improve data quality. The data shall be provided free of charge, in electronic form where applicable, using the format specified by the Commission."
12.1. Quality assurance
12.2. Quality assessment
The data is collected for all the RP2-airports.
The information is published for performance monitoring purposes in accordance with Article 3 of the Performance Regulation (EU) No 390/2013.
14. Accuracy and reliability
14.1. Overall accuracy
The accuracy of the measure is influenced by the availability and the reliability of both the duration and the IATA codes as reported by local bodies.
14.2. Sampling error
There is no sampling and therefore no sampling error.
15. Timeliness and punctuality
The information is published each month by the Network Manager in their “NM Monthly Adherence to ATFCM Slots” bulletin.
The internal databases are updated daily. The statistical processing is performed once per month.
16.1. Comparability — geographical
The data is collected centrally by the Network Manager, as required by the Regulation (EU) No 255/2010. In the scope of the Performance Regulation (390/2013), the data is transmitted to the EUROCONTROL Performance Review Unit and computed consistently for all the EU IR390 airports.
16.2. Comparability over time
Comparison over time is valid.
17.1. Coherence — cross domain
17.2. Coherence — internal
Data is fully coherent from an internal perspective.
18. Cost and burden
19. Data revision
No data revision foreseen.
20. Statistical processing
20.1. Source data
The input variables used for the calculation are detailed in the Statistical concepts and definitions section.
20.2. Frequency of data collection
The data is collected on a daily basis and transmitted for statistical processing on a monthly basis.
20.3. Data collection
The data is collected by the Network manager for the purpose of Regulation (EU) No 255/2010 and transmitted to the EUROCONTROL Performance Review Unit for the implementation of the Performance Regulation (390/2013).
20.4. Data validation
The data is validation as described in the Quality Management section.
20.5. Data compilation
The departure time of a regulated flight is inside the slot tolerance window when its Actual Take-off time (ATOT) is in a window starting 5 minutes before and ending 10 minutes after its Calculated Take-Off time (CTOT), i.e.
CTOT – 5 min <= ATOT <= CTOT + 10 min
It should be acknowledged that the exceptional extension of the standard ATFM slot tolerance window [-5 minutes, +10 minutes], as described in the ATFCM User Manual under 4.6.4 “Adverse Operating Conditions at Aerodromes”, is not taken into account in the calculation of ATFM slot adherence. These exceptions represent in most cases less than 2% of regulated flights.
The adherence to ATFM slots determines the percentage of regulated flights with an ATOT inside the slot tolerance window.
The Actual Take-Off time of a flight can be determined when the NM received an ATC activation message from its departure airport. Therefore, the assessment is made only for those flights for which an activation message at the origin airport (FSA message) or a Departure message (DEP) is available.
Corrections may be made when issues are discovered as described in the Quality Assessment section of this document.
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This data is published by the Performance Review Body (PRB) of the Single European Sky. Every effort has been made to ensure that the information and analysis contained on this website are as accurate and complete as possible. Despite these precautions, should you find any errors or inconsistencies we would be grateful if you could please bring them to the Performance Review Unit’s attention.
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