FullDescription:TMA Operation
ATFM slot swapping
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| Term | ATFM slot swapping |
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slot swapping |
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Abbreviation
Definition
An application that allows airlines to prioritise flights by exchanging the slot of one flight with the slot of another.
Initially limited to flights within the same airline, it now gives airspace users the opportunity to exchange the departure order of any two flights from different airlines penetrating the same constraint (airspace volume, arrival airport). This allows AUs, within commercial agreements, to reduce the delay of a commercially sensitive flight at the cost of another flight.
Definition Source
1st para: SESAR Joint Undertaking, User Driven Prioritisation Process, OSED, Project No. 07.06.04, Ed. 6
2nd para with detailed description: SESAR, Project: 7.6.4
Note
The possibility to extend it further to swapping between flights not sharing the same Most Penalising Regulation is under study. (source: SESAR, Project: 7.6.4)
Lexicon Release
Lexicon Release 2015.2
Advanced Continuous Descent Approach
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| Term | Advanced Continuous Descent Approach |
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Abbreviation
A-CDA
Definition
the progressive implementation of harmonised procedures for CDAs in higher density traffic.
Definition Source
EUROCONTROL, doc. OI AOM-0702
Note
Continuous descent approaches are optimised for each airport arrival procedure. New controller tools and 3D trajectory management enable aircraft to fly, as far as possible, their individual optimum descent profile.
Adverse conditions
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| Term | adverse conditions |
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Abbreviation
Definition
Any event within the operational envelope of the airport, which has a significant negative impact on operational performance unless appropriate actions are organised.
Definition Source
SESAR Operational Service and Environment Definition (OSED) P.6.6.1, Ed.00.00.03, 20.01.2012
Note
This definition encompasses adverse weather conditions.
In most cases, the airport capacity will be affected. However, other Key Performance Areas may also be impacted (e.g. the predictability of operations may decrease). The consequence of adverse conditions at an airport may be arrival and departure delays and / or flight cancellations. In many cases, the ATM Network will also suffer from the disruption. (same source)
Lexicon Release
Lexicon Release 2015.2
Adverse weather conditions
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| Term | adverse weather conditions |
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degraded weather conditions |
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Abbreviation
Definition
Degraded weather condition: a condition which might have a significant negative impact on airport performance unless a proper response is organized (i.e. the selection of an airport operating mode to respond to given degraded conditions and eventually the use of additional airport resources such as de-icing/anti-icing services). This would be the case when visibility is poor and/or in case of freezing conditions, precipitations, etc.
Definition Source
ATM Airport Performance Framework (ATMAP) Measuring Airport Airside and Nearby Airspace Performance, December 2009
Note
Lexicon Release
Lexicon Release 2015.2
Air traffic control clearance
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| Term | Air traffic control clearance |
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ICAO; EU |
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ATC clearance clearance |
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Abbreviation
Definition
Authorization for an aircraft to proceed under conditions specified by an air traffic control unit.
Definition Source
1. ICAO (2007) Official definition, PANS-ATM Procedures for Air Navigation Services — Air Traffic Management [Doc 4444] 2007, 15th ed. (Amdt 4, 15/11/2012)
2. SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
Note
For convenience, the term “air traffic control clearance” is frequently abbreviated to “clearance” when used in appropriate contexts. The abbreviated term “clearance” may be prefixed by the words “taxi”, “take-off”, “departure”, “en-route”, “approach” or “landing” to indicate the particular portion of flight to which the air traffic control clearance relates.
Lexicon Release
Lexicon Release 2015.1
Closed path CDO procedures
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| Term | Closed path CDO procedures |
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Abbreviation
Definition
Procedures coded with track to fix (TF) legs and fly-by waypoints. STARs that terminate with a link to an Instrument Approach Procedure should terminate at a fly-by waypoint. STARs that terminate with vector-based legs may be coded with fix to manual termination (FM) or heading to manual termination (VM) path terminators.
Definition Source
ICAO (2010) Doc 9931, Continuous Descent Operations (CDO) Manual
Note
Continuous descent operation
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| Term | continuous descent operation |
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Abbreviation
CDO
Definition
An operation, enabled by airspace design, procedure design and ATC facilitation, in which an arriving aircraft descends continuously, to the greatest possible extent, by employing minimum engine thrust, ideally in a low drag configuration, prior to the final approach fix /final approach point.
Definition Source
1. ICAO (2010) Doc 9931, Continuous Descent Operations (CDO) Manual
2. SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
Note
1.— An optimum CDO starts from the top of descent and uses descent profiles that reduce , segments of level flight, noise, fuel burn, emissions and controller/pilot communications, while increasing predictability to pilots and controllers and flight stability.
2.— A CDO initiated from the highest possible level in the enroute or arrival phases of flight will achieve the maximum reduction in fuel burn, noise, and emissions.
Lexicon Release
Lexicon Release 2015.1
Controlled Time of Arrival
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| Term | Controlled Time of Arrival |
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working definition (on-going discussion) |
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Abbreviation
CTA
Definition
An ATM imposed time constraint on a defined metering point associated to an arrival runway, to be achieved within the required accuracy by the use of the avionics.
Definition Source
SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
Note
Please note that the term Calculated Time of Arrival (CTA) is a different concept.
Lexicon Release
Lexicon Release 2015.1
Disruptive weather condition
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| Term | disruptive weather condition |
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Abbreviation
Definition
a condition which is very unlikely to occur, it has a severe impact on airport performance, but the airport does not have an appropriate organized response (this might be the case of heavy snow in Rome). In addition, convective weather might create disruptive conditions, even if the airport is well prepared to respond to weather.
Definition Source
ATM Airport Performance Framework (ATMAP) Measuring Airport Airside and Nearby Airspace Performance, December 2009
Note
Lexicon Release
Lexicon Release 2015.2
ETA min/max
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| Term | ETA min/max |
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Estimated Time of Arrival (ETA) |
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Abbreviation
Definition
The earliest/latest ETA at a waypoint, provided the aircraft flies the 4D Trajectory at its max/min allowable speed, wind/temp error is also taken into account, in order to guarantee that any CTA defined within associated ETA min/max interval will be satisfied with high probability.
Definition Source
SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
Note
Lexicon Release
Lexicon Release 2015.1
MergeStrip tool
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| Term | MergeStrip tool |
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Abbreviation
Definition
a tool designed to assist controllers in CDO sequencing and separation.
Definition Source
EUROCONTROL (2013) 3rd European CDO Workshop, Report and Actions
Note
The essence of the MergeStrip concept is that, in an extended environment, a dynamic system can be used to create relative spacing instead of a static map element with fixed lateral flight path.
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MergeStrip components:
•Common route, for example final
•Merge points
•Relative Spacing Tool (here: plots on an imaginary centre line)
•High level concept of operation
•delaying manoeuvre if necessary (speed control or vectoring)
•using FMS capabilities, optimised flying towards one of the merge points
•speed control for maintaining relative spacing
Note Source
SESAR Joint Undertaking (2013) news [1]
Nominal weather condition
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| Term | nominal weather condition |
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Abbreviation
Definition
a weather condition which is excellent or good to conduct airport operations: CAVOK, favourable winds, etc.
Definition Source
ATM Airport Performance Framework (ATMAP) Measuring Airport Airside and Nearby Airspace Performance, December 2009
Note
Lexicon Release
Lexicon Release 2015.2
Pair-wise separation
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| Term | pair-wise separation |
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Abbreviation
PWS
Definition
1. Procedure designed for use between arrivals on final approach or between departures from the runway, based on an optimum adjusting of the needed separation between two aircraft taking into account their respective characteristics and giving Controllers more dynamic separation options.
2. A wake vortex separation based on individual aircraft type.
Definition Source
1. SESAR Concept of Operations Step 1 Edition 2013 (Ed. 01.02.00)
2. SESAR (2011) working package 6, Airport Definitions Team
Note
Lexicon Release
Lexicon Release 2015.1
Target Time
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| Term | Target Time |
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Target Off-Block Time (TOBT) Target Start Up Approval Time (TSAT) Target Take-Off Time (TTOT) Target Landing Time (TLDT) |
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Abbreviation
Definition
In A-CDM, a target time relates to the time of an airport milestone and serves as a "contract" between partners who are thus committed to achieving the milestone at this time. The time is derived only through a collaborative process and is used for milestone monitoring
Definition Source
SESAR, working package 6, Airport Definitions Team
Note
Lexicon Release
Lexicon Release 2015.2
Target Time of Arrival
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| Term | Target Time of Arrival |
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Abbreviation
TTA
Definition
An ATM computed arrival time. It is not a constraint but a progressively refined planning time that is used to coordinate between arrival and departure management applications.
Definition Source
SESAR Concept of Operations Step 2 Edition 2014 (Ed. 01.01.00)
Note
Lexicon Release
Lexicon Release 2015.1
Touchdown
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| Term | touchdown |
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Abbreviation
Definition
The point where the nominal glide path intercepts the runway.
Definition Source
ICAO (2001) Official definition, doc. 4444 PANS-ATM: Procedures for Air Navigation Services — Air Traffic Management
Note
'Touchdown' as defined above is only a datum and is not necessarily the actual point at which the aircraft will touch the runway. (same source)
