4D Trajectory

4 Dimension Trajectory A set of consecutive segments linking waypoints and/or points computed by FMS (airborne) or by TP or Routing function (ground) to build the vertical profile and the lateral transitions (each point defined by a longitude, a latitude, a level and a time [Source: ACDM 2012-airport-cdm-manual-v4]

A-CDM

Airport Collaborative Decision Making (CDM) is a concept which aims at improving Air Traffic Flow and Capacity Management (ATFCM) at airports by reducing delays, improving the predictability of events and optimising the utilisation of resources. Implementation of Airport CDM allows each Airport CDM Partner to optimise their decisions in collaboration with other Airport CDM Partners, knowing their preferences and constraints and the actual and predicted situation.

The decision making by the Airport CDM Partners is facilitated by the sharing of accurate and timely information and by adapted procedures, mechanisms and tools.

The Airport CDM concept is divided in the following Elements:

? Airport CDM Information Sharing

? CDM Turn-round Process ? Milestones Approach

? Variable Taxi Time Calculation

? Collaborative Management of Flight Updates

? Collaborative Pre-departure Sequence

? CDM in Adverse Conditions

? Advanced CDM - [ED-145A Definition]

A-CDM compatibility

A-CDM interoperability

A-CDM Task Force

A-DPI

ATC-Departure Planning Information message DPI message sent by the CDM Airport to the Network Operations (ETFMS) notifying the TTOT between ATC time of pre-departure sequencing and ATOT [Source: ACDM 2012-airport-cdm-manual-v4]

A-SMGCS

Advanced Surface Movement Guidance and Control System System at airports having a surveillance infrastructure consisting of a Non-Cooperative Surveillance (e.g. SMR, Microwave Sensors, Optical Sensors etc) and Cooperative Surveillance (e.g. Multi-lateration systems) [Source: ACDM 2012-airport-cdm-manual-v4]

ACARS

Aircraft Communications Addressing and Reporting System

ACC

Area Control Centre [Source: ACDM 2012-airport-cdm-manual-v4]

ACGT

Actual Commence of Ground Handling Time The time when ground handling on an aircraft starts, can be equal to AIBT (to be determined locally) [Source: ACDM 2012-airport-cdm-manual-v4]

ACISP

Airport CDM Information Sharing Platform [Source: ACDM 2012-airport-cdm-manual-v4]

Acknowledgement message

Actual Commencement of De-icing Time

The time when de-icing operations on an aircraft starts - [ED-145A Definition]

Actual De-icing Time

AEZT - ACZT - [ED-145A Definition]

Actual End of De-icing Time

The time when de-icing operations on an aircraft end - [ED-145A Definition]

Actual Final Approach Time

Actual Ground Handling Time

The total duration of the ground handling of the aircraft. Metric ACGT - AEGT - [EUROCONTROL Specification for A-CDM v0.8]

Actual In Block Time

The time that an aircraft arrives in blocks.

(Equivalent to Airline/Handler ATA ? Actual Time of Arrival, ACARS = IN). - [ED-145A Definition]

Actual Landing Time

The time that an aircraft lands on a runway.

(Equivalent to ATC ATA ?Actual Time of Arrival = landing, ACARS=ON). - [ED-145A Definition]

Actual Off Block Time

Time the aircraft pushes back / vacates the parking position.

(Equivalent to Airline / Handlers ATD ? Actual Time of Departure & ACARS=OUT) - [ED-145A Definition]

Actual Ready for De-icing Time

The time when the aircraft is ready to be de-iced - [ED-145A Definition]

Actual Start Boarding Time

Time passengers are entering the bridge or bus to the aircraft - [EUROCONTROL Specification for A-CDM v0.8]

Actual Start up Approval Time

Time that an aircraft receives its Start up approval. - [ED-145A Definition]

Actual Start up Request Time

Time the pilot requests start up clearance - [EUROCONTROL Specification for A-CDM v0.8]

Actual Take Off Time

The time that an aircraft takes off from the runway.

(Equivalent to ATC ATD?Actual Time of Departure, ACARS = OFF). - [ED-145A Definition]

Actual Taxi-In Time

AIBT - ALDT - [ED-145A Definition]

Actual Taxi-Out Time

ATOT - AOBT - [ED-145A Definition]

Actual Turn-round Time

AOBT - AIBT - [ED-145A Definition]

ACZT

Actual Commencement of De-icing Time The time when de-icing operations on an aircraft starts [Source: ACDM 2012-airport-cdm-manual-v4]

ADEP

Aerodrome of Departure [Source: ACDM 2012-airport-cdm-manual-v4]

ADES

Aerodrome of Destination [Source: ACDM 2012-airport-cdm-manual-v4]

ADEXP

ADEXP provides a format for use primarily in on-line, computer to computer message exchange. ADEXP is a format, not a protocol. - [ED-145A Definition]

ATS Data Exchange Presentation ADEXP provides a format for use primarily in on-line, computer to computer message exchange. ADEXP is a format, not a protocol [Source: ACDM 2012-airport-cdm-manual-v4]

ADIT

Actual De-icing Time Metric AEZT - ACZT [Source: ACDM 2012-airport-cdm-manual-v4]

Advanced Surface Movement Guidance and Control System

System at airports having a surveillance infrastructure consisting of a Non-Cooperative Surveillance (e.g. SMR, Microwave Sensors, Optical Sensors etc) and Cooperative Surveillance (e.g. Multi-lateration systems) - [EUROCONTROL Specification for A-CDM v0.8]

Adverse Condition

Any event within the operational envelope of the airport, which has a significant negative impact on operational performance, unless appropriate actions are organised. - [EUROCONTROL Specification for A-CDM v0.8]

Adverse Conditions Concept Element

Adverse Conditions Element consists of collaborative management of the capacity of an airport during periods of a predicted or unpredicted reduction of capacity

The aim is to achieve a common situational awareness for the Airport CDM Partners, including better information for the passengers, in anticipation of a disruption and expeditious recovery after the disruption

The Concept Elements Information Sharing, Milestones Approach, Variable Taxi Time, and Pre-departure Sequencing need to be implemented at the airport before Adverse Conditions can be implemented successfully [Source: ACDM 2012-airport-cdm-manual-v4]

Adverse Conditions Element

Adverse Conditions Element consists of collaborative management of the ca-pacity of an airport during periods of a predicted or unpredicted reduction of capacity - [Other sources]

AEGT

Actual End of Ground handling Time The time when ground handling on an aircraft ends, can be equal to ARDT (TBD locally) [Source: ACDM 2012-airport-cdm-manual-v4]

Aerodrome Control Tower

A unit established to provide air traffic control service to aerodrome traffic - [EUROCONTROL Specification for A-CDM v0.8]

Aeronautical data

Aeronautical data means a representation of aeronautical facts, concepts or instructions in a formalised manner suitable for communication, interpretation or processing - [Other sources]

Aeronautical Fixed Telecommunication Network

The Aeronautical Fixed Telecommunications Network (AFTN) is a worldwide system of aeronautical fixed circuits provided, as part of the Aeronautical Fixed Service, for the exchange of messages and/or digital data between aeronautical fixed stations having the same or compatible communications characteristics. - [Other sources]

AEZT

Actual End of De-icing Time The time when de-icing operations on an aircraft end [Source: ACDM 2012-airport-cdm-manual-v4]

AFTN

Aeronautical Fixed Telecommunication Network [Source: ACDM 2012-airport-cdm-manual-v4]

AGHT

Actual Ground Handling Time The total duration of the ground handling of the aircraft. Metric ACGT - AEGT [Source: ACDM 2012-airport-cdm-manual-v4]

AIBT

Actual In-Block Time The time that an aircraft arrives in-blocks. (Equivalent to Airline/Handler ATA ?Actual Time of Arrival, ACARS = IN) [Source: ACDM 2012-airport-cdm-manual-v4]

Air Navigation Service Provider

An Air Navigation Service Provider (ANSP) is an organisation that provides the service of managing the aircraft in flight or on the manoeuvering area of an and which is the legitimate holder of that responsibility. - [Other sources]

Air Traffic Flow Management

Air Traffic Flow Management (ATFM) - A service established with the objective of contributing to a safe, orderly and expeditious flow of air traffic by ensuring that air traffic control capacity is utilised to the maximum extent possible, and that the traffic volume is compatible with the capacities declared by the appropriate air traffic services authority.

(ICAO Annex 11, Chapter 1) - [ED-145A Definition]

Air Traffic Service Provider

Air Traffic Services

A generic term meaning variously, flight information service, alerting service, air traffic advisory service, air traffic control service (area control service, approach control service or aerodrome control service). - [ICAO Doc 4444 ed16]

Aircraft Code (IATA)

IATA codes are abbreviations that the International Air Transport Association (IATA) publishes to facilitate air travel. They are typically 1, 2, 3, or 4 character combinations (referred to as unigrams, digrams, trigrams, or tetragrams, respectively) that uniquely identify locations, equipment, companies, and times to standardize international flight operations. All codes within each group follow a pattern (same number of characters, and using either all letters or letter/digit combinations) to reduce the potential for error. - [Other sources]

Aircraft Communications Addressing and Reporting System

Digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite. - [Other sources]

Aircraft Identification (ICAO)

A group of letters, figures or a combination thereof which is either identical to, or the coded equivalent of, the aircraft call sign to be used in air-ground communications, and which is used to identify the aircraft in ground-ground air traffic services communications. - [ICAO Doc 4444 ed16]

Aircraft Operator

The Aircraft Operator is a representative of an airline or a consortium of airlines operating flights to and from the airport. - [EUROCONTROL Specification for A-CDM v0.8]

Aircraft Operator Target Take-Off Time

Aircraft ready

A-CDM Milestone - [ED-145A Definition]

Aircraft Ready Time

When the aircraft is ready for pushback or taxi immediately after clearance delivery (all doors are closed and the pushback tractor ? ordered by the handling agent ? is in position) - [ED-145A Definition]

Aircraft Registration

An aircraft registration is a code unique to a single aircraft, required by international convention to be marked on the exterior of every civil aircraft. - [Other sources]

Aircraft touch down

The moment when an aircraft or spacecraft makes first or final contact with the ground during a landing - [Other sources]

Aircraft turnaround process

The process of or time needed for loading, unloading, and servicing an aircraft, see aircraft ground handling - [Other sources]

Aircraft Type (ICAO)

Airline Operational (Control) Centre

Airline Operator

Airport

A defined area on land or water (including any buildings, installations and equipment) intended to be used either wholly or in part for the arrival, departure and surface movement of aircraft. - [ICAO Doc 4444 ed16]

Airport-CDM implementation

Airport-CDM system

Airport CDM

An airport status that is considered when the Airport CDM Information Sharing, Turn-round process (Milestones Approach), and Variable Taxi Time Calculation Elements are applied at the airport. - [ED-145A Definition]

Airport CDM concept

Airport CDM Information Sharing Concept Element

The Information Sharing Element defines the sharing of accurate and timely information between the Airport CDM Partners in order to achieve common situational awareness and to improve traffic event predictability

The Airport CDM Information Sharing Platform (ACISP), together with defined procedures agreed by the partners, is the means used to reach these aims

Information Sharing is the core Airport CDM Element and the foundation for the other Airport CDM Elements. It needs to be implemented before any other Concept Element [Source: ACDM 2012-airport-cdm-manual-v4]

Airport CDM Information Sharing Element

The Airport CDM Information Sharing Element defines the sharing of accurate and timely information between the Airport CDM Partners in order to achieve common situational awareness and to improve traffic predictability.

The Airport CDM Information Sharing Platform (ACISP), together with defined procedures agreed by the partners, is the means used to reach these aims.

The Airport CDM Information Sharing is the core Airport CDM Element and the foundation for the other Airport CDM Elements. - [ED-145A Definition]

Airport CDM Information Sharing Platform

The Airport CDM Information Sharing Platform (ACISP) is a generic term used to describe the means at a CDM AIRPORT of providing Airport CDM Information Sharing between the Airport CDM Partners.

The ACISP can comprise of systems, tools and user interfaces. - [ED-145A Definition]

Airport CDM Information Sharing Platform (ACISP)

The Airport CDM Information Sharing Platform (ACISP) is a generic term used to describe the means at a CDM Airport of providing Information Sharing between the Airport CDM Partners

The ACISP can comprise of systems, databases, and user interfaces [Source: ACDM 2012-airport-cdm-manual-v4]

Airport CDM mechanism

Airport CDM partner

An Airport CDM Partner is a stakeholder of a CDM AIRPORT, who participates in the CDM process.

The main Airport CDM Partners are:

·        The Airport Operator

·        Aircraft Operators

·        Ground Handlers

·        De-icing companies

·        The Air Navigation Service Provider (ATC)

·        The CFMU

·        Support services (Police, Customs and Immigration etc) - [ED-145A Definition]

Airport CDM procedure

Airport CDM tool

Airport collaboration

Airport Collaborative Decision Making (Airport CDM)

Airport Collaborative Decision Making is the concept which aims at improving Air Traffic Flow and Capacity Management (ATFCM) at airports by reducing delays, improving the predictability of events and optimising the utilisation of resources

Implementation of Airport CDM allows each Airport CDM Partner to optimise their decisions in collaboration with other Airport CDM Partners, knowing their preferences and constraints and the actual and predicted situation

The decision making by the Airport CDM Partners is facilitated by the sharing of accurate and timely information and by adapted procedures, mechanisms and tools

The Airport CDM concept is divided in the following Elements:

Information Sharing

Milestone Approach

Variable Taxi Time

Pre-departure Sequencing

Adverse Conditions

Collaborative Management of Flight Updates

Note: Airport CDM is also the name of the EUROCONTROL project coordinating the implementation of the Airport CDM concept on ECAC airports. This project is part of the DMEAN and SESAR programs [Source: ACDM 2012-airport-cdm-manual-v4]

Airport environment

Airport environment level

Airport of Departure (IATA)

IATA code which uniquely defines an airport of departure. - [Other sources]

Airport of Departure (ICAO)

ADEP is the field name used to indicate the Aerodrom of DEParture in flight planning or flight data tools such as IFPS . - [Other sources]

Airport of Destination (IATA)

IATA code which uniquely defines an airport of destination. - [Other sources]

Airport of Destination (ICAO)

ADES is the field name used to indicate the Aerodrom of DEStination in flight planning or flight data tools such as IFPS . - [Other sources]

Airport operation level

Airport Operations

Airport Operations Programme

ALDT

Actual Landing Time The time that an aircraft lands on a runway. (Equivalent to ATC ATA ?Actual Time of Arrival = landing, ACARS=ON) [Source: ACDM 2012-airport-cdm-manual-v4]

Alert

A system generated message which alerts the Airport CDM Partners of an irregularity and which normally requires one or more partners to make a manual intervention to resolve the irregularity [Source: ACDM 2012-airport-cdm-manual-v4]

AMAN

Arrival Manager An arrival flow management tool that optimises the traffic flow into a TMA and/or runway(s) by calculating TLDT (Target LanDing Time) taking various constraints and preferences into account [Source: ACDM 2012-airport-cdm-manual-v4]

ANSP

Air Navigation Service Provider An organisation responsible for management of flight traffic on behalf of a company, region or country [Source: ACDM 2012-airport-cdm-manual-v4]

Anticipated Actual Take Off Time

AO

Aircraft Operator A person, organisation or enterprise engaged in or offering to engage in an aircraft operation. (ICAO Doc 4444, Chapter 1) [Source: ACDM 2012-airport-cdm-manual-v4]

AOBT

Actual Off-Block Time Time the aircraft pushes back / vacates the parking position. (Equivalent to Airline / Handlers ATD ? Actual Time of Departure & ACARS=OUT) [Source: ACDM 2012-airport-cdm-manual-v4]

AOC

Airport Operator Committee [Source: ACDM 2012-airport-cdm-manual-v4]

APP

Approach Control Unit [Source: ACDM 2012-airport-cdm-manual-v4]

ARDT

Actual Ready Time (for Movement) When the aircraft is ready for start up/push back or taxi immediately after clearance delivery, meeting the requirements set by the TOBT definition [Source: ACDM 2012-airport-cdm-manual-v4]

Area Control Centre

A unit established to provide air traffic control service to controlled flights in control areas under its jurisdiction - [ICAO Doc 4444 ed16]

ARR

Arrival Inbound flight [Source: ACDM 2012-airport-cdm-manual-v4]

Arrival

Inbound flight - [EUROCONTROL Specification for A-CDM v0.8]

Arrival Manager

An Arrival Manager system is primarily designed to provide automated sequencing support for the ATCOs handling traffic arriving at an airport, continuously calculating arrival sequences and times for flights, taking into account the locally defined landing rate, the required spacing for flights arriving to the runway and other criteria. - [Other sources]

Arrival parking position

Aircraft Parking Position means the area on the aircraft apron adjacent to each Gate and designated by the City to serve as the position at which aircraft using each particular Gate must be parked. - [Other sources]

ARZT

Actual Ready for De-icing Time The time when the aircraft is ready to be de-iced [Source: ACDM 2012-airport-cdm-manual-v4]

ASAT

Actual Start Up Approval Time Time that an aircraft receives its start up approval. Note: the moment the start up approval is given can be in advance of the TSAT [Source: ACDM 2012-airport-cdm-manual-v4]

ASBT

Actual Start Boarding Time Time passengers are entering the bridge or bus to the aircraft [Source: ACDM 2012-airport-cdm-manual-v4]

ASRT

Actual Start Up Request Time Time the pilot requests start up clearance [Source: ACDM 2012-airport-cdm-manual-v4]

ATC

Air Traffic Control (ATC) consists of one or more Controllers, located in the ATC Tower, who will be in charge of clearance delivery, ground movement control, and runway control. In some cases ATC also assumes responsibility for Apron Control, while in other cases, this responsibility is managed by the Airport Operator. Both ATC and the Airport Operator ensure the efficient movement of aircraft within their area of responsibility, in order to provide a continuous flow of aircraft in accordance with expected traffic demand. - [EUROCONTROL Specification for A-CDM v0.8]

Air Traffic Control Service provided by ground-based controllers who direct aircraft on the ground and in the air. This to separate, organise and expedite the flow of air traffic [Source: ACDM 2012-airport-cdm-manual-v4]

ATC Departure Planning

DPI message sent at AOBT by the CDM AIRPORT to the CFMU (ETFMS) notifying the TTOT - [ED-145A Definition]

ATC Flight Plan Activation

A-CDM Milestone - [ED-145A Definition]

ATC Flight plan Cancellation message

Standard message sent to NMOC to cancel a flight plan - [EUROCONTROL Specification for A-CDM v0.8]

ATC Flight plan change message

The ATC flight plan change (ACH) is that modification message type distributed by the IFPS upon receipt and successful processing of an FNM, MFS, and AFP for which a valid associated flight plan exists in the IFPS - [Other sources]

ATFCM

Air Traffic Flow and Capacity Management (AFTCM). ATFM extended to the optimisation of traffic patterns and capacity management. Through managing the balance of Capacity and Demand the aim of ATFCM is to enable flight punctuality and efficiency according to the available resources with the emphasis on optimising the network capacity through collaborative decision making process.

(CFMU Handbook ? ATFCM Operating Procedures for FMP 1.0) - [ED-145A Definition]

ATFM

Air Traffic Flow Management A service established with the objective of contributing to a safe, orderly and expeditious flow of air traffic by ensuring that air traffic control capacity is utilised to the maximum extent possible, and that the traffic volume is compatible with the capacities declared by the appropriate Air Traffic Services authority. (ICAO Annex 11, Chapter 1) [Source: ACDM 2012-airport-cdm-manual-v4]

ATM

Management of the demand for, and the use of airspace - [EUROCONTROL Specification for A-CDM v0.8]

ATM capacity

ATM efficiency

ATOT

Actual Take Off Time The time that an aircraft takes off from the runway. (Equivalent to ATC ATD?Actual Time of Departure, ACARS = OFF) [Source: ACDM 2012-airport-cdm-manual-v4]

ATS

Air Traffic Services The service provided by Air Traffic Controllers working at airports for the arrival and departure flight phases and in Air Traffic Control Centres for the en route flight phase [Source: ACDM 2012-airport-cdm-manual-v4]

ATTT

Actual Turn-round Time Metric AOBT ? AIBT [Source: ACDM 2012-airport-cdm-manual-v4]

AXIT

Actual Taxi-In Time Metric AIBT ? ALDT [Source: ACDM 2012-airport-cdm-manual-v4]

AXOT

Actual Taxi-Out Time Metric ATOT ? AOBT [Source: ACDM 2012-airport-cdm-manual-v4]

Boarding starts

A-CDM Milestone - [ED-145A Definition]

C-DPI

Cancel ? Departure Planning Information message This message informs the Network Operations that previously sent DPI is no longer valid [Source: ACDM 2012-airport-cdm-manual-v4]

Calculated Take Off Time

A time calculated and issued by the appropriate central management unit, as a result of tactical slot allocation, at which a flight is expected to become airborne.

(ICAO Doc 7030/4 - EUR, Table 7) - [ED-145A Definition]

Cancel Departure Planning

This message informs the CFMU that previously sent DPI is no longer valid. - [ED-145A Definition]

CBA

Cost-Benefit Analysis A formal discipline used to help appraise, or assess, the case for a project or proposal. This is achieved by weighing the total expected costs against the total expected benefits of one or more actions in order to choose the best or most profitable option [Source: ACDM 2012-airport-cdm-manual-v4]

CDM Airport

An airport is considered a CDM Airport when Information Sharing, Milestone Approach, Variable Taxi Time, Pre-departure Sequencing, Adverse Conditions and Collaborative Management of Flight Updates Elements are successfully implemented at the airport [Source: ACDM 2012-airport-cdm-manual-v4]

CDM in Adverse Conditions

The CDM in Adverse Conditions Element consists of a collaborative management of the capacity of a CDM AIRPORT during periods of a predicted or unpredicted reduction of capacity. The aim is to achieve a common situational awareness for the Airport CDM Partners, including better information for the passengers, in anticipation of a disruption and expeditious recovery after the disruption. At least the Airport CDM Information Sharing [Concept Element / Application] needs to be applied at the CDM AIRPORT to implement the CDM in Adverse Conditions. - [ED-145A Definition]

CDM Turn-round process

The CDM Turn-round Process Element (Milestones Approach) describes the progress of a flight from the initial planning to the take off from a CDM AIRPORT by defining Milestones to enable close monitoring of significant events. The aim is to achieve a common situational awareness and to predict the forthcoming events for each flight. The CDM Turn-round Process combined with the Airport CDM Information Sharing Element is the foundation for the other Airport CDM Elements. - [ED-145A Definition]

CFMU (FUM/DPI)

Central Flow Management Unit (CFMU), Brussels - A Central Management Unit operated by EUROCONTROL.

(ICAO Doc 7754, Volume I, Part V.III, paragraph 3) - [ED-145A Definition]

CFMU (renamed Network Operations)

Central Flow Management Unit Central Flow Management Unit (CFMU), Brussels ? A Central Management Unit operated by EUROCONTROL. (ICAO Doc 7754, Volume I, Part V.III, paragraph 3) [Source: ACDM 2012-airport-cdm-manual-v4]

CFMU Slot Issue Time

The time when the CFMU issues the SAM (Slot Allocation Message). This is normally two hours before EOBT. - [ED-145A Definition]

CHG

Modification message Standard message sent to Network Operations to change flight plan data [Source: ACDM 2012-airport-cdm-manual-v4]

CNL

Flight Plan Cancellation Standard message sent to Network Operations to cancel flight plan [Source: ACDM 2012-airport-cdm-manual-v4]

Collaborative Management of Flight Updates

The Collaborative Management of Flight Updates Element consists of exchanging Flight Update Messages (FUM) and Departure Planning Information (DPI) messages between the CFMU and a CDM AIRPORT to provide estimates for arriving flights to CDM Airports and improve the ATFM slot management process for departing flights.

The aim is to improve the coordination between Air Traffic Flow and Capacity Management (ATFCM) and airport operations at a CDM AIRPORT.

The Airport CDM Information Sharing, CDM Turn-round Process (Milestones Approach) and Variable Taxi Time Calculation Elements need to be applied at the CDM AIRPORT to implement the Collaborative Management of Flight Updates. - [ED-145A Definition]

Collaborative Management of Flight Updates Concept Element

The Collaborative Management of Flight Updates Element consists of exchanging Flight Update Messages (FUM) and Departure Planning Information (DPI) messages between the Network Operations and a CDM Airport, to provide estimates for arriving flights to CDM Airports and improve the ATFM slot management process for departing flights

The aim is to improve the coordination between Air Traffic Flow and Capacity Management (ATFCM) and airport operations at a CDM Airport

The Concept Elements Information Sharing, Milestone Approach, Variable Taxi Time, Pre-departure Sequencing, and Adverse Conditions need to be implemented at the airport before the Collaborative Management of Flight Updates can be implemented in cooperation with Network Operations [Source: ACDM 2012-airport-cdm-manual-v4]

Collaborative Predeparture sequence

The Collaborative Predeparture sequence is the order that aircraft are planned to depart from their stands (push off blocks) taking into account partners? preferences. It should not be confused with the pre-take off order where ATC organise aircraft at the holding point of a runway. The aim is to enhance flexibility, increase punctuality and improve slot-adherence, allowing the airport partners to express their preferences. At least the Airport CDM Information Sharing and the CDM Turn-round Process (Milestones Approach) Elements need to be applied at the CDM AIRPORT to implement the Collaborative Predeparture Sequence. - [ED-145A Definition]

Cost-Benefit Analysis

A cost-benefit analysis (CBA) is the process used to measure the benefits of a decision or taking action minus the costs associated with taking that action. - [Other sources]

CPDLC

Controller Pilot data Link Communication [Source: ACDM 2012-airport-cdm-manual-v4]

CTOT

Calculated Take Off Time A time calculated and issued by the appropriate Central Management unit, as a result of tactical slot allocation, at which a flight is expected to become airborne. (ICAO Doc 7030/4 ? EUR, Table 7) [Source: ACDM 2012-airport-cdm-manual-v4]

Data exchange model

A data interchange model provides the means to convey data among applications - [Other sources]

Data Item IDentifier

Data Management Unit

Data management unit system (DMU)

DCL

Departure Clearance (Data link) [Source: ACDM 2012-airport-cdm-manual-v4]

De-icing Operations

Deicing operations means removing ice from aircraft or runways. - [Other sources]

Delay message

Standard message sent to NMOC to delay flight plan OBT - [EUROCONTROL Specification for A-CDM v0.8]

DEP

Departure Outbound flight [Source: ACDM 2012-airport-cdm-manual-v4]

Departure

Outbound flight - [EUROCONTROL Specification for A-CDM v0.8]

Departure Control System

A departure control system (DCS) automates processing an airline's airport management operation, which includes managing the information required for airport check-in, printing boarding cards, baggage acceptance, boarding, load control and aircraft checks. - [Other sources]

Departure Manager

DMAN is a planning system to improve the departure flows at an airport by calculating the Target Take Off Time (TTOT) and Target Start up Approval Time (TSAT) for each flight, taking multiple constraints and preferences into account - [EUROCONTROL Specification for A-CDM v0.8]

Departure parking position

Parking position of a departing flight is the parking area of an airfield used for aircraft handling. - [Other sources]

Disruption

DLA

Delay message Standard message sent to Network Operations to delay flight plan OBT [Source: ACDM 2012-airport-cdm-manual-v4]

DMAN

Departure Manager DMAN is a planning system to improve the departure flows at an airport by calculating the Target Take Off Time (TTOT) and Target Start up Approval Time (TSAT) for each flight, taking multiple constraints and preferences into account [Source: ACDM 2012-airport-cdm-manual-v4]

Docking Guidance System

Docking guidance system is a system which gives information to a pilot attempting to park an aircraft at an airport stand, usually via visual methods - [Other sources]

DPI

Departure Planning Information message Message from Airport to Network Operations. See also A-DPI, C-DPI, E-DPI, T-DPI [Source: ACDM 2012-airport-cdm-manual-v4]

DPI message

Provides a vital flow of information from their operational ATC Unit to NMOC about the current situation within their ACC and the operational situation at the airport - [EUROCONTROL Specification for A-CDM v0.8]

DPI Status

E-DPI

Early ? Departure Planning Information message First DPI message that is sent from the CDM Airport to the Network Operations (ETFMS) notifying the ETOT [Source: ACDM 2012-airport-cdm-manual-v4]

Early Departure Planning

First DPI message is sent from -3 hrs and before the T-DPI message by the CDM AIRPORT to the CFMU (ETFMS) notifying the ETOT. Also first DPI sent after ATC flight plan Cancellation. - [ED-145A Definition]

EATM Airport Throughput Business Division

ECZT

Estimated Commencement of De-icing Time The estimated time when de-icing operations on an aircraft are expected to start [Source: ACDM 2012-airport-cdm-manual-v4]

EDIT

Estimated De-icing Time Metric EEZT ? ECZT [Source: ACDM 2012-airport-cdm-manual-v4]

EET

Estimated Elapsed Time The estimated time required to proceed from one significant point to another (ICAO) [Source: ACDM 2012-airport-cdm-manual-v4]

EEZT

Estimated End of De-icing Time The estimated time when de-icing operations on an aircraft are expected to end [Source: ACDM 2012-airport-cdm-manual-v4]

EIBT

Estimated In-Block Time The estimated time that an aircraft will arrive in-blocks. (Equivalent to Airline/Handler ETA ? Estimated Time of Arrival) [Source: ACDM 2012-airport-cdm-manual-v4]

ELDT

Estimated Landing Time The estimated time that an aircraft will touchdown on the runway. (Equivalent to ATC ETA ?Estimated Time of Arrival = landing) [Source: ACDM 2012-airport-cdm-manual-v4]

Enhanced Tactical Flow Management System

ETFMS receives radar derived data provided by the Air Navigation Service Providers (ANSPs), position report data provided by the Aircraft Operators and meteorological data. ETFMS uses this data to update the existing data coming from flight plans and flow measures - [EUROCONTROL Specification for A-CDM v0.8]

EOBT

Estimated Off-Block Time The estimated time at which the aircraft will start movement associated with departure (ICAO) [Source: ACDM 2012-airport-cdm-manual-v4]

EOBT-2 hr

A-CDM Milestone - [ED-145A Definition]

ERZT

Estimated Ready for De-icing Time The estimated time when the aircraft is expected to be ready for de-icing operations [Source: ACDM 2012-airport-cdm-manual-v4]

Estimated Commencement of De-icing Time

The estimated time when de-icing operations on an aircraft are expected to start - [ED-145A Definition]

Estimated De-icing Time

EEZT ? ECZT - [ED-145A Definition]

Estimated Elapse Time

The estimated time required to proceed from one significant point to another (ICAO) - [ED-145A Definition]

Estimated End of De-icing Time

The estimated time when de-icing operations on an aircraft are expected to end - [ED-145A Definition]

Estimated In Block Time

The estimated time that an aircraft will arrive in blocks. (Equivalent to Airline/Handler ETA ? Estimated Time of Arrival). - [ED-145A Definition]

Estimated Landing Time

The estimated time that an aircraft will touchdown on the runway. (Equivalent to ATC ETA ? Estimated Time of Arrival = landing). - [ED-145A Definition]

Estimated Off Block Time

The estimated time at which the aircraft will commence movement associated with departure (ICAO). - [ED-145A Definition]

Estimated Ready for De-icing Time

The estimated time when the aircraft is expected to be ready for de-icing operations - [ED-145A Definition]

Estimated Take Off Time

The estimated take off time taking into account the EOBT plus EXOT. - [ED-145A Definition]

Estimated Taxi In Time

The estimated time between landing and in-block - [ED-145A Definition]

Estimated Taxi Out Time

The estimated time between off-block and take off - [ED-145A Definition]

Estimated Time Over

Estimated Turn Round Time

The time estimated by the AO/GH on the day of operation to turn-round a flight taking into account the operational constraints - [ED-145A Definition]

ETFMS

Enhanced Tactical Flow Management System ETFMS receives radar derived data provided by the Air Navigation Service Providers (ANSPs), position report data provided by the Aircraft Operators and meteorological data. ETFMS uses this data to update the existing data coming from flight plans and flow measures [Source: ACDM 2012-airport-cdm-manual-v4]

ETO

Estimated Time Over [Source: ACDM 2012-airport-cdm-manual-v4]

ETOT

Estimated Take Off Time The estimated take off time taking into account the EOBT plus EXOT. [Source: ACDM 2012-airport-cdm-manual-v4]

ETTT

Estimated Turn-round Time The time estimated by the AO/GH on the day of operation to turn-round a flight taking into account the operational constraints [Source: ACDM 2012-airport-cdm-manual-v4]

EUROCAE standard

EUROCONTROL

European organisation for the safety of air navigation - [EUROCONTROL Specification for A-CDM v0.8]

European Air Traffic Management

European ATM network

Event

An event is a distinct occurrence in the planning or operations of a flight that a person or system perceives and responds to in a specific way [Source: ACDM 2012-airport-cdm-manual-v4]

EXIT

Estimated Taxi-In Time The estimated taxi time between landing and in-block [Source: ACDM 2012-airport-cdm-manual-v4]

EXOT

Estimated Taxi-Out Time The estimated taxi time between off-block and take off. This estimate includes any delay buffer time at the holding point or remote de-icing prior to take off [Source: ACDM 2012-airport-cdm-manual-v4]

External interface

A connection to a external device. - [Other sources]

FIDS

Flight Information Display System [Source: ACDM 2012-airport-cdm-manual-v4]

Filed ATC flight plan

ICAO derived flight plan - [EUROCONTROL Specification for A-CDM v0.8]

Final approach

A-CDM Milestone - [ED-145A Definition]

FIR

Flight Information Region [Source: ACDM 2012-airport-cdm-manual-v4]

First System Activation

Flight

the airborne activity of an aircraft defined by one primary identifier and possibly one or more additional identifiers (i.e. code shares). A flight may comprise from one to many flight legs. - [IATA Definitions]

Flight Desuspension

The network manager sends a DES when a flight not subjectto ATFCM restrictions is de-suspended - [Other sources]

Flight Information Display System

Flight Information Display System - [IATA Definitions]

Flight Information Region

Flight information region (FIR) is a specified region of airspace in which a flight information service and an alerting service (ALRS) are provided. - [Other sources]

Flight Number (IATA)

Flight number or flight designator is a code for an airline service consisting of two-character airline designator and a 1 to 4 digit number. - [Other sources]

Flight Suspension

Flight Update Messages

A FUM is sent from the CFMU to a CDM AIRPORT providing an ELDT, ETO and Flight Level at the last point of route. - [ED-145A Definition]

Flow Management Position

FLS

Flight Suspension message Standard message sent from Network Operations to suspend flight plan OBT [Source: ACDM 2012-airport-cdm-manual-v4]

FMP

Flow Management Position Provides a vital flow of information from their operational ATC Unit to the Network Operations about the current situation within their ACC and the operational situation at the airport [Source: ACDM 2012-airport-cdm-manual-v4]

FPL

Filed Flight Plan ICAO derived flight plan [Source: ACDM 2012-airport-cdm-manual-v4]

FRD

Functional Requirements Document This document specifies the minimum set of requirements to implement Airport CDM [Source: ACDM 2012-airport-cdm-manual-v4]

FSA

First System Activation [Source: ACDM 2012-airport-cdm-manual-v4]

FUM

Flight Update Message A message sent from the Network Operations to a CDM Airport providing an ELDT, ETO and flight level at the last point of route [Source: ACDM 2012-airport-cdm-manual-v4]

Functional Requirements Document

Gate

Gate is the portion of an airport that connects an aircraft with its payload. - [Other sources]

General Air Traffic

General air traffic (GAT) encompasses all flights conducted in accordance with the rules and procedures of International Civil Aviation Organisation (ICAO). These may include military flights for which ICAO rules satisfy their operational requirements.

[EUROCONTROL EATM Glossary of Terms] - [Other sources]

GH

Ground Handler Company responsible for handling of aircraft during turn-round at the airport [Source: ACDM 2012-airport-cdm-manual-v4]

Ground Handler

A Ground Handling Agent or Ground Handler is the company or person(s) that perform Ground Handling. - [ED-145A Definition]

Ground Handling

The Ground Handling covers a complex series of processes that are required to separate an aircraft from its load (passengers, baggage, cargo and mail) on arrival and combine it with its load prior to departure. - [ED-145A Definition]

Ground handling start

A-CDM Milestone - [ED-145A Definition]

HMI

Human-Machine Interface The aggregate of means by which people?the users?interact with the system?a particular machine, device, computer program or other complex tools [Source: ACDM 2012-airport-cdm-manual-v4]

IATA

The International Air Transport Association is a trade association of the world's airlines - [Other sources]

IATA designation

IATA format

IATA keyfields

ICAO

The International Civil Aviation Organization is a specialized agency of the United Nations. It changes the principles and techniques of international air navigation and fosters the planning and development of international air transport to ensure safe and orderly growth. - [Other sources]

ICAO designation

The ICAO airline designator is a code assigned by the International Civil Aviation Organization (ICAO) to aircraft operating agencies, aeronautical authorities, and services related to international aviation, each of which is allocated both a three-letter designator and a telephony designator. These codes are unique by airline, unlike the IATA airline designator codes - [Other sources]

ICAO format

Specifications set out by the International Civil Aviation Organisation (ICAO) in relation to machine readable travel documents, including passports, travel documents and visas - [Other sources]

ICAO keyfields

Identification of the flight

The situation which exists when the position indication of a particular aircraft is seen on a situation display and positively identified - [ICAO Doc 4444 ed16]

IFPS

Integrated Initial Flight Plan Processing System A system of the Network Operations designed to rationalise the reception, initial processing and distribution of IFR/GAT flight plan data related to IFR flight within the area covered by the participating States. (ICAO Doc 7030/4 ? EUR, paragraph 3.1.1 new) [Source: ACDM 2012-airport-cdm-manual-v4]

IFR

Instrument Flight Rules [Source: ACDM 2012-airport-cdm-manual-v4]

Implementation Manual

In-block

A-CDM Milestone - [ED-145A Definition]

Initial Flight Plan

The flight plan as filed with an ATS unit by the pilot or a designated representative, without any subsequent changes. - [ICAO Doc 4444 ed16]

Initial Flight Plan Identifier

The data fields which together define a unique flight leg - [IATA Definitions]

Instrument Flight Rules

Instrument flight rules (IFR) is one of two sets of regulations governing all aspects of civil aviation aircraft operations - [Other sources]

Integrated Initial ATC flight plan processing system

Integrated Initial ATC flight plan Processing System (IFPS) - A system of the CFMU designed to rationalise the reception, initial processing and distribution of IFR/GAT ATC flight plan data related to IFR flight within the area covered by the participating States.

(ICAO Doc 7030/4 - EUR, paragraph 3.1.1 new) - [ED-145A Definition]

Interface connection

Connection between two pieces of electronic equipment - [Other sources]

Internal interface

Internal connection of the device - [Other sources]

KPI

Key Performance Indicator [Source: ACDM 2012-airport-cdm-manual-v4]

Landing

A-CDM Milestone - [ED-145A Definition]

LoA

Letter of Agreement [Source: ACDM 2012-airport-cdm-manual-v4]

Local Radar Update

A-CDM Milestone - [ED-145A Definition]

Low Visibility Procedures

LVP

Low Visibility Procedures [Source: ACDM 2012-airport-cdm-manual-v4]

Milestone

This is a significant event that occurs during the planning or operation of a flight

A successfully completed milestone will trigger the decision making process for downstream events and influence both the further progress of the flight and the accuracy with which the progress can be predicted [Source: ACDM 2012-airport-cdm-manual-v4]

Milestone Approach Concept Element

The Milestone Approach Element describes the progress of a flight from the initial planning to the take off by defining Milestones to enable close monitoring of significant events

The aim is to achieve a common situational awareness and to predict the forthcoming events for each flight with off-blocks and take off as the most critical events

The Concept Element Information Sharing needs to be implemented at the airport before it can successfully implement the Milestone Approach

The Milestone Approach combined with the Information Sharing element is the foundation for all other Concept Elements [Source: ACDM 2012-airport-cdm-manual-v4]

Minimum Turn Round Time

The minimum turn-round time agreed with an AO/GH for a specified flight or aircraft type. - [ED-145A Definition]

Modification Message

Standard message sent to NMOC to change flight plan data - [EUROCONTROL Specification for A-CDM v0.8]

MoU

Memorandum of Understanding [Source: ACDM 2012-airport-cdm-manual-v4]

Movement message

Standardised IATA format message, sent via SITA to destination airport, AO and other recipients, containing departure data of a flight - [EUROCONTROL Specification for A-CDM v0.8]

MTTT

Minimum Turn-round Time The minimum turn-round time agreed with an AO/GH for a specified flight or aircraft type [Source: ACDM 2012-airport-cdm-manual-v4]

MVT

Movement message Standardised IATA format message, sent via SITA to destination airport, AO and other recipients, containing departure data of a flight [Source: ACDM 2012-airport-cdm-manual-v4]

OCD

Operational Concept Document [Source: ACDM 2012-airport-cdm-manual-v4]

Off-block

A-CDM Milestone - [ED-145A Definition]

Operational Air Traffic

Operational Air Traffic (OAT) have to perform activities that are fundamentally different than those done by General Air Traffic (GAT) and are not covered by ICAO SARPs. OAT missions include air-to-air refuelling, air combat maneuvring, etc. and the aircraft involved often have supersonic capabilities. - [Other sources]

Operational Concept Document

Document describing the characteristics of a proposed system from the viewpoint of an individual who will use that system. - [Other sources]

Operational decision

Operational decisions are made to execute the short-term processes with the aim of achieving the long- and medium-term goals that the strategic and tactical level decisions have adopted. - [Other sources]

PAX

Passengers [Source: ACDM 2012-airport-cdm-manual-v4]

Phase of flight

The phase of flight refers to a period within a flight. In the case of a manned aircraft, a flight begins when any person boards the aircraft with the intention of flight and continues until such time as all such persons have disembarked. - [Other sources]

PMP

Project Management Plan [Source: ACDM 2012-airport-cdm-manual-v4]

Potential delays

Pre-departure Sequencing Concept Element

The pre-departure sequencing is the order that aircraft are planned to depart from their stands (push off-blocks) taking into account partners? preferences. It should not be confused with the pre-take off order where ATC organise aircrafts at the holding point of a runway

The aim is to enhance flexibility, increase punctuality and improve slot adherence while allowing the airport partners to express their preferences

The Concept Elements Information Sharing, Milestone Approach, and Variable Taxi Time need to be implemented at the airport before the Pre-departure Sequencing can be implemented

Note: The pre-departure sequence can also be derived by a departure manager (DMAN), which calculates based on demand the take off time TTOT and derives the TSAT from the runway sequence. Airports can implement different solutions to achieve the pre-departure sequence, depending on local traffic complexity and surface congestion [Source: ACDM 2012-airport-cdm-manual-v4]

Radio Technical Commission for Aeronautics

RTCA is a United States non-profit organization that develops technical guidance for use by government regulatory authorities and by industry. - [Other sources]

REA

Ready message [Source: ACDM 2012-airport-cdm-manual-v4]

Ready message

REJ

Rejection message [Source: ACDM 2012-airport-cdm-manual-v4]

Rejection message

Repetitive ATC flight plan

Replacement ATC flight plan

RFP

Replacement Flight Plan [Source: ACDM 2012-airport-cdm-manual-v4]

Runway

A defined rectangular area on a land aerodrome prepared for the landing and take-off of aircraft. - [ICAO Doc 4444 ed16]

Runway to Be Used for Landing

The runway for which landings are cleared. - [Other sources]

Runway to Be Used for Take Off

The runway from which departures are cleared. - [Other sources]

RWY

Runway [Source: ACDM 2012-airport-cdm-manual-v4]

SAM

Slot Allocation Message [Source: ACDM 2012-airport-cdm-manual-v4]

Schedule Off Block Time

The time that an aircraft is scheduled to depart from its parking position. - [ED-145A Definition]

Scheduled In Block Time

The time that an aircraft is scheduled to arrive at its parking position. - [ED-145A Definition]

Scheduled Turn-round Time

SOBT - SIBT - [ED-145A Definition]

Secondary Surveillance Radar

Secondary surveillance radar (SSR) is a radar system used in air traffic control (ATC), that unlike primary radar systems that measure the bearing and distance of targets using the detected reflections of radio signals, relies on targets equipped with a radar transponder, that reply to each interrogation signal by transmitting encoded data such as an identity code, the aircraft's altitude and further information depending on its chosen mode. - [Other sources]

Series of sequential events

Service providers

SIBT

Scheduled In-Block Time The time that an aircraft is scheduled to arrive at its first parking position [Source: ACDM 2012-airport-cdm-manual-v4]

SID

Standard Instrument Departure Published flight procedures followed by aircraft on an IFR flight plan immediately after take off from an airport [Source: ACDM 2012-airport-cdm-manual-v4]

SIT1

Network Operations Slot Issue Time The time when the Network Operations issues the SAM (Slot Allocation Message). This is normally two hours before EOBT [Source: ACDM 2012-airport-cdm-manual-v4]

Situational awareness

Situational awareness or situation awareness (SA) is the perception of environmental elements and events with respect to time or space, the comprehension of their meaning, and the projection of their future status. - [Other sources]

SLA

Service Level Agreement [Source: ACDM 2012-airport-cdm-manual-v4]

SLC

Slot Cancellation message Standard message from Network Operations sent when flight regulations are canceled [Source: ACDM 2012-airport-cdm-manual-v4]

Slot Allocation

The allocation of slots between air carriers ('slot allocation') is a planning tool. Its purpose is to ensure, where airport capacity is scarce, that available landing and take-off slots are used efficiently and distributed in a neutral, non-discriminatory and transparent way. - [Other sources]

Slot Allocation Message

Slot Cancellation message

Standard message from NMOC sent when a previously allocated CTOT is cancelled - [EUROCONTROL Specification for A-CDM v0.8]

Slot Revision

Slot Revision Message

Standard message from NMOC sent when a previously allocated CTOT is revised - [EUROCONTROL Specification for A-CDM v0.8]

SOBT

Scheduled Off-Block Time The time that an aircraft is scheduled to depart from its parking position [Source: ACDM 2012-airport-cdm-manual-v4]

SRM

Slot Revision Message Standard message from Network Operations sent when flight regulations are revised [Source: ACDM 2012-airport-cdm-manual-v4]

SSR

Secondary Surveillance Radar [Source: ACDM 2012-airport-cdm-manual-v4]

Standard Arrival Route

A designated instrument flight rule (IFR) arrival route linking the aerodrome or a specified runway of the aerodrome with a specified significant point, normally on a designated ATS route, at which the en-route phase of a flight commences. - [ICAO Doc 4444 ed16]

Standard Instrument Departure

Published flight procedures followed by aircraft on an IFR flight plan immediately after take off from an airport - [EUROCONTROL Specification for A-CDM v0.8]

STAR

Standard Arrival Route [Source: ACDM 2012-airport-cdm-manual-v4]

Start up

A-CDM Milestone - [ED-145A Definition]

Start up request

A-CDM Milestone - [ED-145A Definition]

STTT

Scheduled Turn-round Time Metric SOBT - SIBT [Source: ACDM 2012-airport-cdm-manual-v4]

T-DPI

Target - Departure Planning Information message This DPI message is sent from the CDM Airport to the Network Operations (ETFMS) notifying the Target Take Off Time (TTOT) [Source: ACDM 2012-airport-cdm-manual-v4]

Tactical pre departure sequence

The pre-departure sequence is the order that aircraft are planned to depart from their stands (push off-blocks) taking into account partners' preferences - [Other sources]

Take Off

A-CDM Milestone - [ED-145A Definition]

Take off from outstation

A-CDM Milestone - [ED-145A Definition]

Target Departure Planning

This DPI message is sent from ?2 hrs up to AOBT by the CDM AIRPORT to the CFMU (ETFMS) notifying the Target Take Off Time - [ED-145A Definition]

Target Off Block Time

The time that an aircraft operator / handling agent estimates that an aircraft will be ready, all doors closed, boarding bridge removed, push back vehicle available, ready to start up / push back immediately upon reception of clearance from the TWR . - [ED-145A Definition]

Target Start Up Approval Time

The time provided by ATC taking into account TOBT, CTOT and/or the traffic situation that an aircraft can expect to receive start up / push back approval (when start up and push back are issued together). - [ED-145A Definition]

Target Take Off Time

The Target Take Off Time taking into account the TOBT / TSAT / plus the EXOT. - [ED-145A Definition]

Target Time

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 [Source: ACDM 2012-airport-cdm-manual-v4]

Taxiway

A defined path on a land aerodrome established for the taxiing of aircraft and intended to provide a link between one part of the aerodrome and another, including:

a) Aircraft stand taxilane. A portion of an apron designated as a taxiway and intended to provide access to aircraft stands only.

b) Apron taxiway. A portion of a taxiway system located on an apron and intended to provide a through taxi route across the apron.

c) Rapid exit taxiway. A taxiway connected to a runway at an acute angle and designed to allow landing aeroplanes to turn off at higher speeds than are achieved on other exit taxiways thereby minimizing runway occupancy times. - [ICAO Doc 4444 ed16]

TBD

To Be Defined [Source: ACDM 2012-airport-cdm-manual-v4]

Testing specification

Test specifications are iterative, generative blueprints of test design. They are written at the item level, and allow test developers or item writers to produce new versions of a test. - [Other sources]

TLDT

Target Landing Time Targeted Time from the Arrival management process at the threshold, taking runway sequence and constraints into account. It is not a constraint but a progressively refined planning time used to coordinate between arrival and departure management processes. Each TLDT on one runway is separated from other TLDT or TTOT to represent vortex and/or SID separation between aircraft [Source: ACDM 2012-airport-cdm-manual-v4]

TOBT

Target Off-Block Time The time that an Aircraft Operator or Ground Handler estimates that an aircraft will be ready, all doors closed, boarding bridge removed, push back vehicle available and ready to start up / push back immediately upon reception of clearance from the TWR [Source: ACDM 2012-airport-cdm-manual-v4]

TOBT update

A-CDM Milestone - [ED-145A Definition]

Traffic predictability

TSAT

Target Start Up Approval Time The time provided by ATC taking into account TOBT, CTOT and/or the traffic situation that an aircraft can expect start up / push back approval. Note: The actual start up approval (ASAT) can be given in advance of TSAT [Source: ACDM 2012-airport-cdm-manual-v4]

TSAT Issue

A-CDM Milestone - [ED-145A Definition]

TTOT

Target Take Off Time The Target Take Off Time taking into account the TOBT/TSAT plus the EXOT. Each TTOT on one runway is separated from other TTOT or TLDT to represent vortex and/or SID separation between aircraft [Source: ACDM 2012-airport-cdm-manual-v4]

TWR

Aerodrome Control Tower [Source: ACDM 2012-airport-cdm-manual-v4]

Variable Taxi Time

Variable Taxi Time is the estimated time that an aircraft spends taxiing between its parking stand and the runway or vice versa

Variable Taxi Time is the generic name for both inbound as outbound taxi time parameters, used for calculation of TTOT or TSAT. Inbound taxi time (EXIT) includes runway occupancy and ground movement time, whereas outbound taxi time (EXOT) includes push back & start up time, ground movement, remote or apron de-icing, and runway holding times [Source: ACDM 2012-airport-cdm-manual-v4]

Variable Taxi Time Calculation

The Variable Taxi Time Calculation Element consists of calculating and distributing to the Airport CDM Partners accurate estimates of taxi-in and taxi-out times to improve the estimates of in-block and take off times. The complexity of the calculation may vary according to the needs and constraints at the CDM AIRPORT.

The aim is to improve the traffic predictability.

At least the Airport CDM Information Sharing Element needs to be applied at the CDM AIRPORT to implement the Variable Taxi Time Calculation. - [ED-145A Definition]

Variable Taxi Time Concept Element

The Variable Taxi Time Element consists of calculating and distributing to the Airport CDM Partners accurate estimates of taxi-in and taxi-out times to improve the estimates of in-block and take off times. The complexity of the calculation may vary according to the needs and constraints at the CDM Airport. The aim is to improve the traffic predictability

The Concept Elements Information Sharing and Milestone Approach need to be implemented at the airport before Variable Taxi Time can be implemented [Source: ACDM 2012-airport-cdm-manual-v4]

VFR

Visual Flight Rules [Source: ACDM 2012-airport-cdm-manual-v4]

Visual Flight Rules

A flight conducted in accordance with the visual flight rules. - [ICAO Doc 4444 ed16]

VTT

Variable Taxi Time Common name for inbound (EXIT) and outbound (EXOT) Taxi Times. The Variable Taxi Time replaces the default Taxi Time [Source: ACDM 2012-airport-cdm-manual-v4]

WBS

Work Breakdown Structure [Source: ACDM 2012-airport-cdm-manual-v4]

WP

Work Package [Source: ACDM 2012-airport-cdm-manual-v4]