Calculated Take-off Time Slot
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- From the hour mark to 6 minutes = 0 time paid. Over 7 minutes to 15 minutes = 1/4 hour 15. 16 minutes to 30 minutes = 1/2 hour 30. 30 minutes to 45 minutes = 3/4 hour 45. 46 minutes to 60 minutes = one hour. They work on shifts and the operation is 24 hours. Each gets 30 minutes for breaks which is not paid.
- Demand is managed by giving the aircraft a slot stating when it can take-off – the ‘Calculated Time of Take Off’ or CTOT. Normally, the aircraft should take-off within 15 minutes of the time stated in its flight plan but, if a slot is necessary, then this window is shrunk – to within five minutes before the CTOT or within ten minutes after the CTOT.
- Definition The Calculated Take-Off Time (CTOT) is the departure time slot also known as ATFM departure slot (air traffic flow management). The departure time slot is the time interval within which the take-off has to take place. The departure slot is defined to improve the traffic flow and avoid to jam-up the airspace.
Contacts
| Contact organisation | EUROCONTROL: The European organisation for the safety of air navigation |
| Contact organisation unit | Directorate European Civil-Military Aviation - Performance Review Unit (DECMA/PRU) |
| Contact name | Performance Review Unit - EUROCONTROL |
| Contact mail address | 96 Rue de la Fusée1130 BrusselsBelgium |
| Contact e-mail address | PRU-Support@eurocontrol.int |
Metadata update
| Metadata last certified | not applicable |
| Metadata last update | 01 November 2016 |
Statistical presentation
Data description
ATFM departure slots are allocated centrally by the European Network Manager upon the requestof the local Flow Management Position (FMP), when an imbalance between demand and capacity isforeseen 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 thatflights 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 predictionsat 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 informationregarding non-compliance to slot adherence for these airports where non-adherence equalsor exceeds 20% of the regulated departures, as well as their action plans to mitigate sucha non-compliance.
In application to Regulation (EU) No 255/2010, the Network Manager monitors ATFM slot adherenceon a monthly basis.
The Performance Regulation (390 / 2013), Annex I Section 2 para 3.2(a) also requiresATFM slot adherence to be monitored at local level, i.e. at national level with a breakdownat airport level.
Classification system
ATFM slot adherence is classified per Member State, with a breakdown for each airport subject to EU IR390.
Sector coverage
The measures pertain to the Air Transport and Air Traffic Management Sectorof the economy.
Statistical concepts and definitions
ATFM slot adherence is defined as the percentage of departures inside anATFM slot tolerance window of [-5 minutes, +10 minutes].
Statistical unit
The statistical unit is the airport. Airport level data is also aggregated to States.
Statistical population
The statistical population is the set of ‘the 2nd reference period (RP2) airports’subject [EU IR390 / 2013]]law, within the Single European Sky Area.
Reference area
The reference area is the Single European Sky Area of RP2 (2015-2019).
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.
Base period
Not applicable.
Unit of Measure
The ATC pre-departure delay is measured in minutes per outbound IFR flight [min/departure].
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.
Institutional Mandate
Legal acts and agreements are established in theCommission Implementing Regulation (EU) No 390 / 2013.
Confidentiality
The information is disseminated in accordance with Article 21 of Commission Implementing Regulation (EU) No 390 / 2013.
Release policy
Release calendar
ATFM slot adherence is released monthly with yearly aggregates.
Release calendar access
Not applicable.
User access
Information is disseminated to the general public via the SES Data Portal.
Frequency of dissemination
Data is published monthly with the annual performance aggregate being available in Januaryof the following year.
Dissemination format
Information is disseminated to the general public via the SES Data Portal.
Accessibility of documentation
Documentation on methodology
As per the pertaining regulations (see Institutional Mandate).For technical questions not addressed in Statistical processingplease contact: PRU-Support@eurocontrol.int.Additional definitions of the terms used in the frame of the this KPIare available in the Metadata page.
Quality documentation
There is no specific documentation on procedures applied for quality managementand quality assessment.
Quality Management
As per Performance Regulation (390 / 2013), Article 21 (3),
The data providers shall takethe necessary measures to ensure the quality, validation and timely transmission of the data,including providing evidence of their quality checks and validation processes, explanationsin 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.
Quality assurance
Data validation is performed by the Network manager in the theRegulation (EU) No 255 / 2010.
Quality assessment
Quality assessment is under the responsibility of the Network managerin the context of the Regulation (EU) No 255 / 2010.
Completeness
The data is collected for all the RP2-airports.
Relevance
The information is published for performance monitoring purposes in accordancewith Article 3 of the Performance Regulation (EU) No 390 / 2013.
Accuracy and reliability
Overall accuracy
The information is published for performance monitoring purposes in accordance withArticle 3 of the Performance Regulation (EU) No 390 / 2013.
Sampling error
There is no sampling and therefore no sampling error.
Timeliness and punctuality
Timeliness
The information is published each month by the Network Manager in their“NM Monthly Adherence to ATFCM Slots” bulletin.
Punctuality
The internal databases are updated daily. The statistical processingis performed once per month.
Comparability
Comparability — geographical
The data is collected centrally by the Network Manager, as required by theRegulation (EU) No 255 / 2010.In the scope of the Performance Regulation (390 / 2013), the data is transmitted tothe EUROCONTROL Performance Review Unit and computed consistently for all the EU IR390 airports.
Comparability over time
Comparisons over time are valid.
Coherence
Coherence — cross domain
Calculated Take-off Time Slot Machine
Not available.
Coherence — internal
Data is fully coherent from an internal perspective.
Cost and burden
Not available.
Data revision
No data revision foreseen.
Statistical processing
Source data
The input variables used for the calculation are detailed in theStatistical concepts and definitions section.
Frequency of data collection
The data is collected and transmitted for statistical processing on a monthly basis.
Data collection
The data is collected by the Network Manager for the purpose ofRegulation (EU) No 255 / 2010 and transmitted to the EUROCONTROL Performance Review Unitfor the implementation of the Performance Regulation (390 / 2013).
Data validation
The data is validation as described in the Quality Management section.
Data compilation
The departure time of a regulated flight is inside the slot tolerance window when itsActual Take-off time (ATOT) is in a window starting 5 minutes before and ending 10 minutes afterits Calculated Take-Off time (CTOT), i.e.
$$CTOT – 5 min <= ATOT <= CTOT + 10 min $$
It should be acknowledged that the exceptional extension of the standardATFM slot tolerance window [-5 minutes, +10 minutes], as described in the ATFCM User Manualunder 4.6.4 “Adverse Operating Conditions at Aerodromes”, is not taken into account in thecalculation 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 ATOTinside the slot tolerance window.
The Actual Take-Off time of a flight can be determined when the NM receivedan ATC activation message from its departure airport.Therefore, the assessment is made only for those flights for which an activation messageat the origin airport (FSA message) or a Departure message (DEP) is available.
Adjustment
Corrections may be made when issues are discovered as described in theQuality Assessment section of this document.
Comment
Calculated Take-off Time Slots
No comments.
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.The information may be copied in whole or in part providing that the copyright notice and disclaimer are included. The information may not be modified without prior written permission from the PRB. The views expressed herein do not necessarily reflect the official views or policy of EUROCONTROL or of the European Commission, which make no warranty, either implied or express, for the information contained on this website, neither do they assume any legal liability or responsibility for the accuracy, completeness or usefulness of this information. The PRB reserves the right to change or amend the information provided at any time and without prior notice.
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(kăl′kyə-lā′tĭd)adj.calculatedly
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