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A list of all pages that have property "Definition" with value "A defined three dimensional region of space relevant to air traffic". Since there have been only a few results, also nearby values are displayed.

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  • Stopway  + (A defined rectangular area on the ground at the end of the take-off run available that has been prepared as a suitable area in which an aircraft can be stopped in the case of an abandoned take-off.)
  • Clearway  + (A defined rectangular area on the ground or water under the control of the appropriate authority, selected or prepared as a suitable area over which an aircraft may make a portion of its initial climb to a specified height.)
 (A defined three dimensional region of space relevant to air traffic)
  • Airspace  + (A defined three dimensional region of space relevant to air traffic.)
  • Methodology  + (A defined, repeatable series of steps to address a particular type of problem, which typically centers on a defined process, but may also include definition of content.)
  • Information Entity  + (A definition (type) of an operational ATM item of interest that is subject to constraints.)
  • Integrity of aeronautical data  + (A degree of assurance that an aeronautical data and its value has not been lost or altered since the data origination or authorized amendment.)
  • Accuracy  + (A degree of conformance between the estimated or measured value and the true value.)
  • Primary delay  + (A delay other than reactionary.)
  • Visual Approach Slope Indicator System Approach Slope  + (A descent angle determined for visual vertical guidance during the final approach.)
  • Final Approach Descent Angle  + (A descent profile prescribed for vertical guidance during a final approach.)
  • Instrument flight procedure  + (A description of a series of predetermined flight manoeuvres by reference to flight instruments, published by electronic and/or printed means.)
  • Service interaction  + (A description of an information exchange between ATM stakeholders’ systems which can potentially be automated.)
  • Operational Scenario  + (A description of how a future system could
    A description of how a future system could work. Each scenario describes the behaviour of users and the future system, interaction between the two, and the wider context of use. From a detailed scenario the ATM Stakeholders should be able to identify user requirements and potential business cases.
    requirements and potential business cases.)
  • Secondary Power Description  + (A description of the availability of emergency power supply for the feature.)
  • Aerodrome Snow Plan  + (A description of the general snow plan considerations at the aerodrome.)
  • Course Type  + (A descriptor of the aircraft course to be flown.)
  • Standard Instrument Arrival  + (A designated Instrument Flight Rule (IFR) arrival route linking a significant point, normally on an Air Traffic Service (ATS) route, with a point from which a published instrument approach procedure can be commenced.)
  • Aircraft Stand  + (A designated area on an apron intended to be used for parking an aircraft.)
  • Helipad  + (A designated area, usually with a prepared surface, used for the take-off, landing, or parking of helicopters.)
  • Taxi-holding position  + (A designated position at which taxiing aircraft and vehicles shall stop and hold position, unless otherwise authorized by the aerodrome control tower.)
  • Intermediate Holding Position  + (A designated position intended for traffic control at which taxiing aircraft and vehicles shall stop and hold until further cleared to proceed, when so instructed by the aerodrome control tower.)
  • Runway Holding Position  + (A designated position intended to protect a runway, an obstacle limitation surface, or an ILS/MLS critical/sensitive area at which taxiing aircraft and vehicles shall stop and hold, unless otherwise authorized by the aerodrome control tower.)
  • Advisory route  + (A designated route along which air traffic advisory service is available.)
  • Derived Aerodrome Location Identifier  + (A designated sequence of characters formulated by the appropriate authority or provider, allowing the identification of an aerodrome which may not have an assigned ICAO or IATA code.)
  • Air Traffic Service Route Designator  + (A designator permitting the identification of any Air Traffic Service (ATS) route.)
  • Aircraft arresting hook  + (A device fitted to an aircraft to engage arresting gear.)
  • Landing Direction Indicator  + (A device that indicates visually the direction currently designated for landing and for take-off.)
  • Air data computer  + (A device which computes altitude, vertical speed, air speed and mach number from inputs of pitot and static pressure and temperature.)
  • Runway Radar Reflector  + (A device, normally placed near the threshold of a runway, used for reflecting radar signals.)
  • Target report  + (A digital message which depending on the filtering function applied can be either polished / filtered plot or track.)
  • Network Manager Directorate  + (A directorate of Eurocontrol, located in Brussels.)
  • Flight progress display  + (A display of data from which the actual and intended progress of flights may be readily determined.)
  • Safety Directive  + (A document issued or adopted by a competent authority which mandates actions to be performed on a functional system to restore safety, when evidence shows that aviation safety may otherwise be compromised.)
  • Business plan  + (A document or series of documents intended to determine the mission, goals and individual objectives of an organisation in preparation for implementation over some stated period of time.)
  • Air traffic controller licence  + (A document that identifies a person as a qualified air traffic controller and contains personal, medical and professional qualifications including details of ratings, endorsements and current competence/validity.)
  • Propose route function  + (A dynamic route generator available in [[IFPS]], [[NOP]] and CIAO (in the [[AOWIR]] tool).It provides one or more routes according to a series of conditions such as city-pair, aircraft type, [[EOBT]], etc.)
  • Air route traffic control center  + (A facility established to provide air traf
    A facility established to provide air traffic control service to aircraft operating on IFR flight plans within controlled airspace and principally during the en route phase of flight. When equipment capabilities and controller workload permit, certain advisory/assistance services may be provided to VFR aircraft.
    services may be provided to VFR aircraft.)
  • Radio navigation aid  + (A facility or system external to the aircraft that generates electro-magnetic signals to be used by aircraft navigation systems for position determination or flight path guidance.)
  • Radio Navigation Service Limitation  + (A factor which would detract expected performance of a navigational aid signal circular sector.)
  • Noise factor  + (A figure defined for a receiver as the rat
    A figure defined for a receiver as the ratio of the noise at the output of the practical receiver and the noise output of an ideal receiver at standard temperature T0 (290° K). The noise factor is in practice defined as the Signal-to-Noise ratio at the input divided by the Signal-to-Noise ratio at the output of a receiver.
    o-Noise ratio at the output of a receiver.)
  • Bandpass filter  + (A filter designed to transmit a range of frequencies (the bandwidth) between two cutoff frequencies and to reject frequencies outside that range.)
  • Missed approach turning fix  + (A fix different from MAPt [missed approach point] that marks a turn in the missed approach segment.)
  • Along-track error  + (A fix error along the flight track resulting from the total error contributions.)
  • Initial Approach Fix  + (A fix that marks the beginning of the initial segment and the end of the arrival segment, if applicable.)
  • Intermediate Fix  + (A fix that marks the end of an initial segment and the beginning of the intermediate segment.)
  • Along-track tolerance  + (A fix tolerance along the nominal track resulting from the airborne and ground equipment tolerances.)
  • Missed approach holding fix  + (A fix used in RNAV applications that marks the end of the missed approach segment and the centre point for the missed approach holding.)
  • Military Variable Profile Area  + (A flexible composition of defined modular portions of airspace to fulfil military needs, restricting airspace utilisation for other airspace users only by the necessary minimum.)
  • IFR flight  + (A flight conducted in accordance with instrument flight rules (IFR).)
  • Controlled VFR flight  + (A flight conducted under VFR within Class B airspace and in accordance with an ATC clearance.)
  • Replacement Flight Plan Procedure  + (A flight planning procedure whereby the flight plan originator substitutes the original routeing for an alternative one.)
  • Amplitude modulation  + (A form of modulation in which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal.)
  • Certification  + (A formal evaluation and confirmation by or on behalf of the appropriate authority for aviation security that a person possesses the necessary competencies to perform assigned functions to an acceptable level as defined by the appropriate authority.)
  • Requirement  + (A formal statement of what is needed. For example a Service Level Requirement, a Project Requirement or the required Deliverables for a Process.)
  • Data Element  + (A formalised representation of data.)
  • Information Element  + (A formalised representation of information.)
  • ATS Data Exchange Presentation  + (A format, rather than a protocol, used primarily in on-line computer-to-computer message exchange. Specific uses include flight planning and [[Air Traffic Flow & Capacity Management]] (ATFCM) messages.)
  • Aerodrome Location Description  + (A free text description of the aerodrome site direction and distance from the city it serves or from another point easily distinguishable from the air.)
  • Vertical navigation  + (A function of [[area navigation]] (RNAV) equipment which calculates, displays and provides guidance to a vertical profile or path.)
  • Centralised Airspace Data Function  + (A function that has been established within the Network Manager Operations Centre (NMOC) to collect Airspace Use Plan (AUP) information from the Airspace Management Cells (AMC).)
  • Aircraft Operator What-If-Reroute  + (A function within ETFMS where the Aircraft Operator ([[AO]]) can interrogate the ATFCM systems for a possible reroute, using the CFMU [[Common Human Machine Interface]] (CHMI) or the Network Operations Portal ([[NOP]]).)
  • Cone of silence  + (A gap in coverage above a radar due to the limitations of the antenna performance at high elevation angles.)
  • Cockpit Display of Traffic Information  + (A generic avionics device on the flight deck that is capable of displaying the position information of nearby aircraft. It may also include ground reference points and navigation information to increase the AIRSAW.)
  • Emergency locator transmitter  + (A generic term describing equipment which
    A generic term describing equipment which broadcast distinctive signals on designated frequencies and, depending on application, may be automatically activated by impact or be manually activated. An ELT may be any of the following: Automatic fixed ELT (ELT(AF)). An automatically activated ELT which is permanently attached to an aircraft. Automatic portable ELT (ELT(AP)). An automatically activated ELT which is rigidly attached to an aircraft but readily removable from the aircraft. Automatic deployable ELT (ELT(AD)). An ELT which is rigidly attached to an aircraft and which is automatically deployed and activated by impact, and, in some cases, also by hydrostatic sensors. Manual deployment is also provided. Survival ELT (ELT(S)). An ELT which is removable from an aircraft, stowed so as to facilitate its ready use in an emergency, and manually activated by survivors.
    ency, and manually activated by survivors.)
  • Unit  + (A generic term meaning variously all types of 'units' providing all types of services. This includes particularly Air Traffic Management (ATM) Units but also units which are not expressis verbis included in ATM such as SAR, MET, COM etc.)
  • ATS surveillance system  + (A generic term meaning variously, ADS-B, PSR, SSR or any comparable ground-based system that enables the identification of aircraft.)
  • Air traffic services unit  + (A generic term meaning variously, air traffic control unit, flight information centre or air traffic services reporting office.)
  • Air traffic control unit  + (A generic term meaning variously, area control centre, approach control unit or aerodrome control tower.)
  • Emergency phase  + (A generic term meaning, as the case may be, uncertainty phase, alert phase or distress phase.)
  • Level  + (A generic term relating to the vertical position of an aircraft in flight and meaning variously, height, altitude or flight level.)
  • Target level of safety  + (A generic term representing the level of risk which is considered acceptable in particular circumstances.)
  • Air Refuelling Point  + (A geographic position or radio navigation fix along an air refuelling anchor pattern or air refuelling track.)
  • Area of responsibility (world area forecast system)  + (A geographical area for which a [[regional area forecast centre]] prepares significant weather forecasts.)
  • Holding fix  + (A geographical location that serves as a reference for a holding procedure.)
  • Influence Diagram  + (A graphical representation of the interdependence between influencing factors. The approach originates from the field of decision analysis and decision making.)
  • Interrogator-responsor  + (A ground-based combined transmitter-receiver element of an SSR system.)
  • Approach Path Monitor  + (A ground-based safety net intended to warn the controller about increased risk of controlled flight into terrain accidents by generating, in a timely manner, an alert of aircraft proximity to terrain or obstacles during final approach.)
  • Area proximity warning  + (A ground-based safety net intended to warn the controller about unauthorised penetration of an airspace volume by generating, in a timely manner, an alert of a potential or actual infringement of the required spacing to that airspace volume.)
  • Short Term Conflict Alert  + (A ground-based safety net intended to assist the controller in preventing collision between aircraft by generating, in a timely manner, an alert of a potential or actual infringement of separation minima.)
  • Minimum Safe Altitude Warning  + (A ground-based safety net intended to warn the controller about increased risk of controlled flight into terrain accidents by generating, in a timely manner, an alert of aircraft proximity to terrain or obstacles.)
  • Ground-based safety net  + (A ground-based safety net is a functionali
    A ground-based safety net is a functionality within the ATM system that is assigned by the ANSP with the sole purpose of monitoring the environment of operations in order to provide timely alerts of an increased risk to flight safety which may include resolution advice.
    afety which may include resolution advice.)
  • ATM functionality  + (A group of ATM operational functions or services related to trajectory, airspace and surface management or to information sharing within the en-route, terminal, airport or network operating environments.)
  • Formation component  + (A group of aircraft of the same type that participate to the flight.)
  • Aircraft type designator  + (A group of alphanumeric characters used to identify, in an abbreviated form, a type of aircraft.)
  • Aircraft call sign  + (A group of alphanumeric characters used to identify an aircraft in air-ground communication.)
  • Multilateration system  + (A group of equipment configured to provide
    A group of equipment configured to provide position derived from the secondary surveillance radar (SSR) transponder signals (replies or squitters) primarily using [[time difference of arrival]] (TDOA) techniques. Additional information, including identification, can be extracted from the received signals.
    an be extracted from the received signals.)
  • Aircraft identification  + (A group of letters, figures or a combinati
    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.
    round air traffic services communications.)
  • Route portion  + (A group of two or more consecutive segments of the same route, which have the usage and/or the same flight restrictions)
  • Aircraft Approach Category  + (A grouping of aircraft based on a speed of 1.3 times the stall speed in the landing configuration at maximum gross landing weight.)
  • Hardened Aircraft Shelter  + (A hardened structure built above or partially above ground that encloses aircraft to provide protection from enemy attack.)
  • Shuttle air service  + (A high-frequency, no reservation passenger air service operated at regular intervals, typically on a city-pair route with high traffic density.)
  • Goal  + (A high-level statement of intent or direction for an organization. Typically used to measure success of an organization.)
  • Clear-air turbulence  + (A higher altitude (6–15 km) turbulence phenomenon occurring in cloud-free regions, associated with wind shear, particularly between the core of a jet stream and the surrounding air.)
  • Sum and difference antenna  + (A hog-trough or LVA antenna which is elect
    A hog-trough or LVA antenna which is electrically split into two halves. The two half-antenna outputs are added in phase at one output port (sum, ) and added in antiphase at a second output port (difference, ) to produce output signals which are sensitive to the azimuth angle of arrival of received signals, enabling an off-boresite angle for the signal source to be obtained.
    ngle for the signal source to be obtained.)
  • Traffic separation service  + (A kind of service that provides control and separation services, to aircraft in the air and on the ground.)
  • Special Navigation System Station  + (A land based facility emitting a radio signal for a [[Special Navigation System]].)
  • Aeronautical station  + (A land station in the aeronautical mobile service. In certain instances, an aeronautical station may be located, for example, on board ship or on a platform at sea.)
  • Code  + (A language-independent set of letters, numbers or symbols that represent a concept whose meaning is described in a natural language.)
  • Dry lease  + (A leasing arrangement in which only the aircraft is provided, without crew or maintenance guarantees. Under a dry-lease arrangement, the aircraft is operated under the AOC of the lessee.)
  • Wet lease agreement  + (A leasing arrangement in which the aircraft is provided plus at least one pilot. Under a wet-lease arrangement, the aircraft is normally operated under the AOC of the lessor.)
  • Cruising level  + (A level maintained during a significant portion of a flight.)
  • Supplementary crossing level  + (A level, at or above which, or at or below which a flight has been co-ordinated to cross the transfer of control point. The supplementary level, if present, is an element of the exit level.)
  • Flight crew member  + (A licensed crew member charged with duties essential to the operation of an aircraft during a flight duty period.)
  • Aeronautical Ground Light  + (A light specifically provided as an aid to air navigation, with the exception of obstacle lights and lights forming part of surface or approach lighting systems.)
  • Aerodrome Movement Area Lighting  + (A lighting system providing guidance to an aircraft or vehicle while on a ground movement area of an aerodrome.)
  • Quick Reaction Codes  + (A limited amount of Omni directional [[SSR code]]s made available by the CCAMS Office on request in case of a single ATS unit failure.)
  • Procedure Designator  + (A limited series of characters by which the flight procedure is identified in electronic systems.)
  • Vertical structure part geometry  + (A link class that allows selecting between the three different possibilities for describing the horizontal projection of an obstacle: point, line or polygon.)
  • Master minimum equipment list  + (A list established for a particular aircra
    A list established for a particular aircraft type by the organization responsible for the type design with the approval of the State of Design containing items, one or more of which is permitted to be unserviceable at the commencement of a flight. The MMEL may be associated with special operating conditions, limitations or procedures.
    ing conditions, limitations or procedures.)
  • Minimum equipment list  + (A list which provides for the operation of aircraft, subject to specified conditions, with particular equipment inoperative, prepared by an operator in conformity with, or more restrictive than, the [[MMEL]] established for the aircraft type.)
  • Touchdown and Lift-off Area  + (A load bearing area on which an aircraft/helicopter may touch down or lift-off.)
  • Back lobe  + (A lobe of radiated energy to the rear of an antenna (180° in azimuth with respect to the main lobe).)
  • Local Airspace Type  + (A locally specified designation denoting a particular airspace category as defined by a local authority.)
  • Aerodrome Hot Spot  + (A location on an aerodrome movement area with a history or potential risk of either collision or runway incursion, and where heightened attention by pilots/drivers is necessary.)
  • Functional block  + (A logical and cohesive grouping of automated Functions in a Technical System.)
  • Activity  + (A logical process, specified independently of how the process is carried out.)
  • Compass Locator  + (A low or medium powered Non-Directional Beacon (NDB) used as an aid for final approach.)
  • Non-Directional Radio Beacon  + (A low or medium radio navigation service transmitting signals whereby the pilot of a suitably equipped aircraft can determine bearings, 'home in' on, and/or track to or from the station.)
  • Boresight  + (A main lobe electrical (radio) axis of an antenna.)
  • Missed Approach  + (A manoeuvre conducted by a pilot when an instrument approach cannot be completed to a landing. The route of flight and altitude are shown on instrument approach procedure charts.)
  • Aircraft operating manual  + (A manual, acceptable to the State of the Operator, containing normal, abnormal and emergency procedures, checklists, limitations, performance information, details of the aircraft systems and other material relevant to the operation of the aircraft.)
  • Cyclic Redundancy Check  + (A mathematical algorithm applied to the digital expression of data that provides a level of assurance against loss or alteration of data.)
  • Regulated Tactical Flight Model  + (A mathematical model containing a point pr
    A mathematical model containing a point profile and airspace volume profile, created in the [[Enhanced Tactical Flow Management System]] ([[ETFMS]]) for a flight when [[Air Traffic Flow and Capacity Management]] ([[ATFCM]]) measures have been applied to the flight. Called Calculated Profile on [[CHMI]].
    ht. Called Calculated Profile on [[CHMI]].)
  • Filed Tactical Flight Model  + (A mathematical model containing a point and airspace volume profile created in [[Enhanced Tactical Flow Management System]] (ETFMS) for a flight when [[Flight plan]] details, and any subsequent changes, are received from Network Operations.)
  • Current Tactical Flight Model  + (A mathematical model containing a point profile and airspace volume profile created in the [[Enhanced Tactical Flow Management System]] (ETFMS) for a flight which has been activated. (Called Actual Profile on CHMI.))
  • Automatic Dependent Surveillance-Broadcast  + (A means by which aircraft, aerodrome vehicles and other objects can automatically transmit and/or receive data such as identification, position and additional data, as appropriate, in a broadcast mode via a data link.)
  • Security control  + (A means by which the introduction of weapons, explosives or other dangerous devices, articles or substances which may be used to commit an act of unlawful interference can be prevented.)
  • Automatic Dependent Surveillance-Contract  + (A means by which the terms of an ADS-C agreement will be exchanged between the ground system and the aircraft, via a data link, specifying under what conditions ADS-C reports would be initiated, and what data would be contained in the reports.)
  • Controller-pilot data link communications  + (A means of communication between controller and pilot, using data link for ATC communications.)
  • Mode S subnetwork  + (A means of performing an interchange of digital data through the use of secondary surveillance radar (SSR) Mode S interrogators and transponders in accordance with defined protocols.)
  • Gain of antenna  + (A measure for the antenna of the increased (effective) transmitted power density radiated in a particular direction as compared to the power density that would have been radiated from an isotropic antenna (expressed in dB).)
  • Declared capacity  + (A measure of the ability of the ATC system
    A measure of the ability of the ATC system or any of its subsystems or operating positions to provide service to aircraft during normal activities. It is expressed as the number of aircraft entering a specified portion of airspace in a given period of time, taking due account of weather, ATC unit configuration, staff and equipement available, and any other factors that may affect the workload of the controller responsible for the airspace.
    e controller responsible for the airspace.)
  • Integrity  + (A measure of the trust that can be placed in the correctness of the information supplied by the total system. Integrity includes the ability of a system to provide timely and valid warnings to the user (alerts).)
  • Performance  + (A measure of what is achieved or delivered by a System, person, team, Process, or IT Service.)
  • Performance Driver Indicator  + (A measure that directly affects an outcome
    A measure that directly affects an outcome or achievement of a Key Performance Indicator (KPI). PDI is a performance metric that is associated with a preceding step in a value stream or business process. It will contribute directly to a KPI and may be a component in the way the KPI is calculated.
    omponent in the way the KPI is calculated.)
  • Side-lobe suppression  + (A mechanism in an SSR transponder activate
    A mechanism in an SSR transponder activated by the transmission (radiation) of a control pulse (P2 or P5) of amplitude greater than the antenna side-lobe signals-in-space, which will enable the transponder to prevent itself from replying to the side-lobe interrogation signals.
    ng to the side-lobe interrogation signals.)
  • Airport and Airways Surveillance Radar  + (A medium range radar designed for both airway and airport surveillance applications.)
  • Slot Allocation Message  + (A message giving a [[Calculated Take-Off T
    A message giving a [[Calculated Take-Off Time]] (CTOT) sent by the [[Computer-Assisted Slot Allocation]] (CASA) system of the Enhanced Tactical Flow Management System ([[ETFMS]]) to the operators of regulated flights a maximum of two hours before the [[Estimated Off-Block Time]] (EOBT).
    e the [[Estimated Off-Block Time]] (EOBT).)
  • Request for direct improvement message  + (A message sent by Aircraft Operators in order to change the flight readiness from [[Slot Improvement Proposal Wanted]] ([[SWM]]) status to Request For (direct) Improvement status.)
  • Slot Improvement Proposal Wanted Message  + (A message sent by Aircraft Operators in order to change the flight readiness status from Request For Improvement (RFI) status to Slot Improvement Wanted status.)
  • De-Suspension Message  + (A message sent by [[ETFMS]] to a suspended flight when the reason for a suspension no longer applies and the flight is not regulated.)
  • Supplementary flight plan message  + (A message sent by [[IFPS]], as a reply to a RQS ([[Request Supplementary Flight Plan Message]]), including the Field 19 information contained in the flight plan form, but not transmitted with the flight plan message.)
  • Request Flight Plan message  + (A message sent by an ATS ([[Air Traffic Se
    A message sent by an ATS ([[Air Traffic Service]]s) Unit, or an Aircraft Operator, to both [[IFPS]] units, when they need a copy of the Flight Plan. IFPS will reply to the originator of an RQP either by sending the Flight plan message or a [[REJ]] message with an error indicating that there is no Flight Plan matching the query.
    here is no Flight Plan matching the query.)
  • Request Supplementary Flight Plan Message  + (A message sent by an ATS ([[Air Traffic Se
    A message sent by an ATS ([[Air Traffic Service]]s) Unit to both [[IFPS]] units when they need information contained in the flight plan form (Field 19), but not transmitted in the filed flight plan message. IFPS will reply either by sending a [[SPL]] (Supplementary flight plan) message, or, a plain text message explaining that no supplementary information is recorded on the flight plan form.
    ation is recorded on the flight plan form.)
  • Aircraft Operator's Position Report  + (A message sent by an Aircraft Operator for long-haul flights on departure, giving an Expected Time of Arrival (ETA) at destination.)
  • Flight Update Message  + (A message sent from the [[ETFMS]] to a [[CDM Airport]] providing an ELDT, ETO (Estimated Time Over) and flight level at the last point of route.)
  • Slot Improvement Proposal message  + (A message sent to a flight in [[Slot Improvement Proposal Wanted status]]. It proposes a new and improved [[Calculated Take-Off Time]] (CTOT), which may then be accepted or rejected by the Aircraft Operator.)
  • Arrival message  + (A message that can be sent by an ATS Unit to IFPS for an IFR/GAT flight.)
  • Flight Confirmation Message  + (A message to be sent to Enhanced Tactical Flow Management System (ETFMS) confirming the operation of the flight or announcing the Runway Visual Range (RVR) value.)
  • Air Traffic Flow and Capacity Management Information Message  + (A message transmitted by the Network Manag
    A message transmitted by the Network Manager Operations Centre (NMOC) to provide information, advice and to promulgate instructions relating to the application of current Air Traffic Flow & Capacity Management ([[ATFCM]]) measures. It is also used for the initial publication of the Network Operations ATFCM operating procedures that affect all users.
    perating procedures that affect all users.)
  • Tropical cyclone advisory centre  + (A meteorological centre designated by regi
    A meteorological centre designated by regional air navigation agreement to provide advisory information to meteorological watch offices, world area forecast centres and international OPMET data banks regarding the position, forecast direction and speed of movement, central pressure and maximum surface wind of tropical cyclones.
    maximum surface wind of tropical cyclones.)
  • Volcanic Ash Advisory Centre  + (A meteorological centre designated by regi
    A meteorological centre designated by regional air navigation agreement to provide advisory information to meteorological watch offices, area control centres, flight information centres, world area forecast centres and international OPMET databanks regarding the lateral and vertical extent and forecast movement of volcanic ash in the atmosphere following volcanic eruptions.
    e atmosphere following volcanic eruptions.)
  • World Area Forecast Centre  + (A meteorological centre designated to prepare and issue significant weather forecasts and upper-air forecasts in digital form on a global basis direct to States by appropriate means as part of the aeronautical fixed service.)
  • Regional area forecast centre  + (A meteorological centre designated to prep
    A meteorological centre designated to prepare and supply significant weather forecasts and upper wind and temperature charts for flights departing from aerodromes within its service area and to supply grid point data in digital form for up to worldwide coverage.
    digital form for up to worldwide coverage.)
  • Meteorological Watch Office  + (A meteorological office designated to: —
    A meteorological office designated to: — maintain watch over meteorological conditions affecting flight operations within its area of responsibility (a [[Flight Information Region]] (FIR) or a control area or combinations thereof); — prepare [[SIGMET]] and other information related to its area of responsibility; — supply SIGMET information and, as required, other meteorological information to associated [[air traffic services unit]]s (i.e. ACC or FIC); — disseminate SIGMET information; — supply information received on pre-eruption volcanic activity, a volcanic eruption and volcanic ash cloud for which a SIGMET has not already been issued, to its associated ACC/FIC, as agreed between the meteorological and ATS authorities concerned, and to its associated [[Volcanic Ash Advisory Centre]] (VAAC) as determined by regional air navigation agreement; and — supply information received concerning the accidental release of radioactive materials into the atmosphere, in the area for which it maintains watch or adjacent areas, to its associated ACC/FIC, as agreed between the meteorological and ATS authorities concerned, and to aeronautical information service units, as agreed between the meteorological and appropriate civil aviation authorities concerned.
    iate civil aviation authorities concerned.)
  • Regulation  + (A method of matching traffic demand to available capacity by limiting the number of flights planned to enter an airspace or aerodrome, achieved by the issuing of departure slots (CTOTs).)
  • Area navigation  + (A method of navigation which permits aircraft operations on any desired flight path within the coverage of ground- or spaced-based navigation aids or within the limits of the capability of self-contained aids, or a combination of these.)
  • Interrogator side-lobe suppression  + (A method of preventing transponder replies to interrogations transmitted through the ground antenna side lobes.)
  • Receiver Side-Lobe Suppression  + (A method, using two (or more) receivers to suppress aircraft replies which have been received via side lobes of the main beam of the antenna.)
  • Tactical Air Navigation Aid Beacon  + (A military Ultra High Frequency (UHF) radio navigation service able to provide continuous bearing and Distance Measuring Equipment (DME) distance to a selected station.)
  • Minimum Departure Interval  + (A minimum time interval that is required between successive departures on the same [[Standard Instrument Departure]] (SID).)
  • Aircraft earth station  + (A mobile earth station in the aeronautical mobile-satellite service located on board an aircraft.)
  • Aeronautical mobile service  + (A mobile service between aeronautical stat
    A mobile service between aeronautical stations and aircraft stations, or between aircraft stations, in which survival craft stations may participate; emergency position-indicating radio beacon stations may also participate in this service on designated distress and emergency frequencies.
    gnated distress and emergency frequencies.)
  • Aeronautical mobile-satellite service  + (A mobile-satellite service in which mobile earth stations are located on board aircraft; survival craft stations and emergency position-indicating radiobeacon stations may also participate in this service.)
  • Reactionary delay multiplier  + (A multiplier applied to the cost of an initial delay to account for the costs of consequential delay.)
  • Designated Point  + (A named geographical location not marked by the site of a radio navigation aid, used in defining an Air Traffic Service (ATS) route, the flight path of an aircraft and/or for other navigation or ATS purposes.)
  • VORTAC  + (A navigation aid providing VOR azimuth, TACAN azimuth, and TACAN Distance Measuring Equipment (DME) at one site.)
  • Area navigation (RNAV) specification  + (A navigation specification based on area navigation that does not include the requirement for performance monitoring and alerting, designated by the prefix RNAV, e.g. RNAV 5, RNAV 1.)
  • Required navigation performance (RNP) specification  + (A navigation specification based on area navigation that includes the requirement for performance monitoring and alerting, designated by the prefix RNP, e.g. RNP 4, RNP APCH.)
  • Rerouteing Rejection Message  + (A negative reply to a Rerouting Proposal (RRP).)
  • Satellite Based Augmentation System  + (A network of ground stations and satellites designed to receive navigation signals, improving the accuracy and ensuring the integrity of information for navigation and landing.)
  • Enhanced Braking Systems  + (A new generation braking systems that apply predetermined braking to the aircraft such that the aircraft reaches a defined speed at a selected point on the runway.)
  • Stack swapping  + (A non-[[ATFCM]] measure used by some [[Flo
    A non-[[ATFCM]] measure used by some [[Flow Management Position]]s (FMP) to reduce the impact of an expected high traffic load at one [[Initial Approach Fix]] (IAF) of an airport having multiple IAFs. It involves airborne traffic being tactically re-routed away from the IAF expecting the high load, to another IAF for the same airport, which anticipates a lower loading.
    irport, which anticipates a lower loading.)
  • Association of European Airlines  + (A non-profit industry organisation, bringing together 30 major European airlines as the trusted voice of the European airline industry for 60 years.)
  • Charter carrier  + (A non-scheduled air carrier which operates only charter flights.)
  • Aeronautical information circular  + (A notice containing information that does not qualify for the origination of a NOTAM or for inclusion in the AIP, but which relates to flight safety, air navigation, technical, administrative or legislative matters.)
  • Microwave Landing System Channel  + (A number corresponding to the Microwave Landing System (MLS) frequency, as per ICAO Annex 10, Chapter 3, Table A.)
  • Pavement Classification Number  + (A number expressing the bearing strength of a pavement for unrestricted operations.)
  • Distance Measuring Equipment Channel  + (A number followed by a letter corresponding to the DME frequency, as per ICAO Annex 10, Chapter 3, Table A.)
  • Holding stack  + (A number of aircraft holding at a common fix with vertical separation.)
  • Delta theta  + (A number of azimuth count pulses (ACPs) as measured from the plot leading edge to the plot trailing edge in a sliding window plot extractor. Also known as azimuth extension or [[plot run length]].)
  • Integrated Aeronautical Information Package  + (A package which consists of the following elements: — AIP, including amendment service; — Supplements to the AIP; — NOTAM and PIB; — AIC; and — checklists and lists of valid NOTAM.)
  • Time to Remove from Sequence  + (A parameter that prevents a change to a later [[CTOT]] when the flight is already in the departure sequence. It may be adjusted at any time depending on the local aerodrome traffic situation and may vary during the day.)
  • Time to Insert into Sequence  + (A parameter that prevents an improvement i
    A parameter that prevents an improvement into an already organised departure sequence. It may be adjusted at any time depending on the local aerodrome traffic situation and may vary during the day. The TIS parameter is not relevant when ATC has sent an REA message for a flight.
    ATC has sent an REA message for a flight.)
  • Procedure Segment Leg  + (A part of an instrument or visual flight procedure defined by two consecutive significant points.)
  • Vertical structure part  + (A part of the [[vertical structure]] that can be represented as point, line or polygon with vertical extent.)
  • Analytical simulation  + (A particular part-task training based on simulations. It allows for practice in restricted or in real time a part of the skills necessary for the operational task in a realistic environment (PTT or simulator).)
  • Passenger-kilometres performed  + (A passenger-kilometre is performed when a
    A passenger-kilometre is performed when a passenger is carried one kilometre. Calculation of passenger-kilometres equals the sum of the products obtained by multiplying the number of [[revenue passenger]]s carried on each flight stage by the stage distance. The resultant figure is equal to the number of kilometres travelled by all the passengers.
    ilometres travelled by all the passengers.)
  • Dead time  + (A period of time during which an SSR trans
    A period of time during which an SSR transponder is inhibited from receiving signals after a valid interrogation is received and a reply transmitted. The term is also used to describe the time after the normal range for returns and before the next transmission from an interrogator or from a primary radar system.
    terrogator or from a primary radar system.)
  • Aerodrome Flight Information Service Officer  + (A person properly trained, competent and duly authorized to provide aerodrome flight information service and, if necessary, licensed.)
  • In-flight security officer  + (A person who is authorized by the governme
    A person who is authorized by the government of the State of the Operator and the government of the State of Registration to be deployed on an aircraft with the purpose of protecting that aircraft and its occupants against [[acts of unlawful interference]]. This excludes persons employed to provide exclusive personal protection for one or more specific people travelling on the aircraft, such as personal bodyguards.
    the aircraft, such as personal bodyguards.)
  • Aircraft Operator  + (A person, organisation or enterprise engaged in or offering to engage in an aircraft operation.)
  • Aircraft operating agency  + (A person, organization or enterprise engaged in or offering to engage in an aircraft operation.)
  • What-if flight  + (A placeholder for containing information o
    A placeholder for containing information of interest regarding alternative flights. An alternative flight is essentially a copy of the real flight and is used to negotiate potential changes to the flight data without affecting the corresponding data for the actual flight.
    corresponding data for the actual flight.)
  • Arrival Manager  + (A planning system to improve arrival flows
    A planning system to improve arrival flows at one or more airports by calculating the optimised approach / landing sequence and Target Landing Times (TLDT) and, where needed, times for specific fixes for each flight, taking multiple constraints and preferences into account.
    constraints and preferences into account.)
  • Target Time Over  + (A planning time computed by ground systems for flight planning and execution to coordinate at network level and enhance the effectiveness of [[ATFCM]] measures for congestions at en-route locations..)
  • Aeronautical Radio Navigation Service Checkpoint  + (A point established and marked on the surface of an aerodrome where the checking of a navigation system can be accomplished.)
  • Land and Hold Short Operations Hold Short Point  + (A point on the runway beyond which a landing aircraft is not authorized to proceed when instructed to conduct a [[Land and Hold Short Operation]] (LAHSO).)
  • Altimeter Check Location  + (A point or area designated at an aerodrome where the checking of an altimeter system can be accomplished.)
  • Control pattern  + (A polar diagram of the [[control antenna]]. Modern integrated SSR antennas have a “modified cardioid” beamshape.)
  • Apron taxiway  + (A portion of a taxiway system located on an apron and intended to provide a through taxi route across the apron.)
  • Air Traffic Service Route Segment  + (A portion of an Air Traffic Service (ATS) route to be flown between two consecutive significant points.)
  • Aircraft stand taxilane  + (A portion of an apron designated as a taxiway and intended to provide access to aircraft stands only.)
  • Isolated Aircraft Parking Position  + (A position designated on an aerodrome which is suitable for the parking of an aircraft which is known or believed to be the subject of unlawful interference, or which for other reasons needs to be isolated from normal aerodrome activities.)
  • Microwave Landing System  + (A precision approach and landing guidance system operating in the microwave spectrum, which provides position information and various ground-to-air data.)
  • Abbreviated Precision Approach Path Indicator  + (A precision approach path indicator (PAPI) consisting of only two light units situated on the left side of the runway.)
  • Category IIIB operation  + (A precision instrument approach and landing with: a) a decision height lower than 15 m (50 ft) or no decision height; and b) a runway visual range less than 175 m but not less than 50 m.)
  • Category IIIC operation  + (A precision instrument approach and landing with no decision height and no runway visual range limitations.)
  • Category IIIA operation  + (A precision instrument approach and landing with: a) a decision height lower than 30 m (100 ft) or no decision height; and b) a runway visual range not less than 175 m.)
  • Category I operation  + (A precision instrument approach and landing with: a) a decision height not lower than 60 m (200 ft); and b) with either a visibility not less than 800 m or a runway visual range not less than 550 m.)
  • Category II operation  + (A precision instrument approach and landing with: a) a decision height lower than 60 m (200 ft), but not lower than 30 m (100 ft), and b) a runway visual range not less than 300 m.)
  • Holding Procedure  + (A predetermined manoeuvre which keeps an aircraft within a specified airspace while awaiting further clearance.)
  • Air Refuelling Anchor Pattern  + (A prescribed pattern, established by air refuelling points, along which air-to-air refuelling of aircraft is performed.)
  • Air Refuelling Track  + (A prescribed route, established by air refuelling points, geographic points and/or radio navigation fixes, along which air-to-air refuelling of aircraft is performed.)
  • Moving Target Indicator  + (A primary radar filtering device designed to reject fixed clutter and pass moving target on the basis of their [[Doppler shift]]. Or more generally a pre-whitening filter that reduces the fixed clutter below the white noise level.)
  • Performance Expectation  + (A priori estimations of a potential performance outcome or impact that could be expected to be achieved as a consequence of the implementation of an envisaged operational improvement, but remains to be validated and confirmed.)
  • Round reliability  + (A probability of receipt of a correct reply, resulting from either an SSR interrogation or a PSR transmission.)
  • Ground-initiated Comm-B protocol  + (A procedure initiated by a Mode S ground station for eliciting a Comm-B message from a Mode S airborne installation.)
  • Reversal procedure  + (A procedure designed to enable aircraft to reverse direction during the [[Initial Approach Segment]] of an [[Instrument Approach Procedure]]. The sequence may include procedure turns or base turns.)
  • Mode S air-initiated Comm-B protocol  + (A procedure initiated by a Mode S transponder for transmitting a single Comm-B segment from the aircraft installation.)
  • Air Refuelling Procedure  + (A procedure used by the military to transfer fuel from one aircraft to another during flight.)
  • Defruiting  + (A process by which aircraft replies accept
    A process by which aircraft replies accepted by the [[interrogator-responsor]] are tested by means of storage and a comparator for synchronism with the interrogation-repetition frequency. Only replies which are in synchronism (correlate on a repeated basis in range) will be output from the defruiter. Other replies are rejected as “[[fruit]]” or false.
    lies are rejected as “[[fruit]]” or false.)
  • Collaborative Decision Making  + (A process focused on how to decide on a course of action articulated between two or more community members.)
  • Flight data analysis  + (A process of analysing recorded flight data in order to improve the safety of flight operations.)
  • Assemble  + (A process of merging data from multiple sources into a database and establishing a baseline for subsequent processing.)
  • Degarbling  + (A process of separating (and possibly validating) garbled SSR replies)
  • Service attribute  + (A property of a service. Examples: response time, frequency of invocation, message exchange pattern.)
  • Asynchronous Transfer Mode  + (A protocol for the transmission of a variety of digital signals using uniform 53 byte cells.)
  • Mode S specific protocol  + (A protocol that provides restricted datagram service within the Mode S subnetwork.)
  • Aeronautical information publication  + (A publication issued by or with the authority of a State and containing aeronautical information of a lasting character essential to air navigation.)
  • Navigation Aid Point Angular Indication  + (A published bearing to or radial from a radio navigation aid, referenced to a significant point or radio navigation aid checkpoint.)
  • Navigation Aid Point Distance Indication  + (A published distance between a radio navigation aid and a significant point or radio navigation aid checkpoint.)
  • Obstacle Identifier  + (A published identifier allowing the unique identification of an obstacle within a State.)
  • Direct Routing  + (A published segment of a [[Great Circle]] between 2 published waypoints.)
  • Aeronautical Radio Navigation Service Identifier  + (A published sequence of alpha characters allowing the identification of the radio navigation service.)
  • Airspace Identifier  + (A published sequence of characters allowing the unique identification of the airspace.)
  • Control pulse  + (A pulse (P2 for Modes A and C, P5 for Mode S) transmitted by the ground equipment (SSR interrogator) in order to ensure side-lobe suppression.)
  • Safety objective  + (A qualitative or quantitative statement that defines the maximum frequency or probability at which a hazard can be expected to occur.)
  • Architecture principles  + (A qualitative statement of intent that should be met by the architecture. Has at least a supporting rationale and a measure of importance.)
  • False plot  + (A radar plot report which does not correspond to the actual position of a real aircraft (target), within certain limits.)
  • Lead Radial  + (A radial or bearing which provides the appropriate lead distance to assist in turning onto the next segment of an Instrument Approach Procedure (IAP).)
  • Marker Radio Beacon  + (A radio navigation service identifying a particular location in space by means of a 75 megahertz (MHz) transmitter which transmits a directional signal to be received by aircraft flying overhead.)
  • Difference pattern  + (A receive (1 090 MHz) characteristic of a
    A receive (1 090 MHz) characteristic of a monopulse SSR antenna, obtained by connecting in antiphase the signals (replies) received by two partial antennas. The difference pattern has a minimum in the main radiation direction of the antenna and an amplitude and phase characteristic which varies as a function of angle of arrival of the received signal. Used in conjunction with the sum output of the antenna, it enables the [[off-boresight angle]] to be found.
    s the [[off-boresight angle]] to be found.)
  • Hit  + (A reception by the aircraft equipment (transponder) of one usable set of interrogation pulses as evidenced by a reply code return (i.e. receipt of 2 interrogation pulses and 1 control pulse).)
  • Reduced Vertical Separation Minimum  + (A reduction to 1000 feet vertical separation between flights, which is used in Europe and on the North Atlantic, between FL290 and FL410.)
  • Airworthiness Directive  + (A regulatory document which identifies aer
    A regulatory document which identifies aeronautical products in which an unsafe condition exists or where the condition is likely to exist or develop in other products of the same type design. It prescribes corrective actions to be taken or the conditions or limitations under which the products may continue to be operated.
    the products may continue to be operated.)
  • Resource Interaction  + (A relationship specifying the need to exchange data between Capability Configurations.)
  • Interlace  + (A repeating series of SSR interrogation mo
    A repeating series of SSR interrogation modes. The interlace pattern may be determined either on a p.r.p. (pulse-repetition period) to p.r.p. basis or on an antenna rotation to antenna rotation basis. It may also be made on a combined p.r.p./antenna basis.
    e made on a combined p.r.p./antenna basis.)
  • Pilot weather report  + (A report by a pilot pertaining to weather conditions encountered in flight.)
  • Air-report  + (A report from an aircraft in flight prepared in conformity with requirements for position, and operational and/or meteorological reporting.)
  • Aeronautical data  + (A representation of aeronautical facts, concepts or instructions in a formalized manner suitable for communication, interpretation or processing.)
  • Asset  + (A resource from which future economic benefits are expected to flow to the entity that owns or controls it.)