Oct 16, 2019 Slots are used to manage arrivals and departures at busy airports. Photo: Phillip Capper via Wikimedia What is an airport slot? A ‘slot’ is simply the permission of the airport operator for an airline to land a plane (and then take off – each slot is effectively a landing/take off pair). A better solution would be slot auctions, in which carriers bid to hold slots for staggered periods of five or ten years. Regulators in America and China have thought about this sort of approach. AIRBUS A330 CHICAGO DEPARTUREme on Instagramme on Twitterhttps://twitt.

1. Take-off Slot Time Aviation
2. Calculated Take-off Time Slot
3. Take-off Slot Time For

Abbreviation

CTOT

Definition

1.A time calculated and issued by the Central Flow Management unit, as a result of tactical slot allocation, at which a flight is expected to become airborne.

2.An Air Traffic Flow & Capacity Management (ATFCM) departure slot, forming part of an Air Traffic Control (ATC) clearance, which is issued to a flight affected by Network Management regulations. It is defined by a time and tolerance (-5 to +10 minutes) during which period the flight is expected to take-off.

Definition Source

Take-off Slot Time Aviation

1. EUROCONTROL/IATA/ACI, Airport CDM Implementation Manual, V.4, March 2012

2. NM Glossary (2014)

Note

Reference: ICAO Doc 7030/4 – EUR, Table 7

Lexicon Release

Lexicon Release 2016.1

• 2Regulation

Definition

If the assigned time slot is missed by the pilot, a new CTOT has to be requested to the controller. The pilot shall bear in mind that priority is given to aircraft which are respecting the assigned slot.

Regulation

General rules

The circumstances that require different priority rules include :

• exclusion of certain traffic flows that enter but do not reduce the capacity of the location of the measure
• exclusion or forcing of specific flights in order to reduce excessive individual delays and optimise the use of capacity
• exclusion and prioritization of specific flights that are not able to benefit from rerouting measures due to overflight permissions or similar constraints

The following flights are exempted from ATFM measures:

• flights carrying Heads of State (or equivalent status);
• flights engaging in fire fighting
• flights conducting search and rescue operations;
• flights for life critical medical emergencies evacuations
• flights approved for exemption from ATFM measures by the appropriate ATS authority
• STS/ATFMX

Controller rules

• a slot tolerance is a window of time around a CTOT available to ATC which the aircraft must not depart outside
• ATS units shall provide all possible assistance to operators to meet ATFM slots or to coordinate a revised ATFM slot

In America, the CTOT is issued by the ATCSSC (Air Traffic Control System Command Center) using very similar procedures.

Use of CTOT on IVAO

Several cases may be envisaged:

• In the case of a specific event, a booking form is available on the internet site of the event. Each booked flight is associated with a CTOT and the controllers must respect the CTOT list generated over the whole booking phase.
• In the case of heavy load on a platform, the controller may issue a CTOT to help the regulation of departures.

If the pilot is ready on time, ATC must handle the traffic in order to make the aircraft taking off within the assigned time slot.

See also

• None

Reference

Calculated Take-off Time Slot

• None

Author

• VID 150259 - Creation
• VID 446375 - Update
• VID 531824 - Wiki Integration

Take-off Slot Time For

DATE OF SUBMISSION

• 01:15, 15 November 2020

COPYRIGHT

• This documentation is copyrighted as part of the intellectual property of the International Virtual Aviation Organisation.

DISCLAIMER

• The content of this documentation is intended for aviation simulation only and must not be used for real aviation operations.