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Aviation Dictionary

Reference:

1 Airplane Flying Handbook
2 Pilot's Handbook of Aeronautical Knowledge
3 Instrument Procedures Handbook
4 Risk Management Handbook
5 Aviation Instructor Handbook
6 Seaplane Handbook
7 Balloon Handbook
8 Aeronautical Information Manual
9 Airplane Flying Handbook
10 Pilot Controller Glossary
11 Glider Handbook

A

Abeam, Fix

4 NAVAID, point, or object positioned approximately 90 degrees to the right or left of the aircraft track along a route of flight. Abeam indicates a general position rather than a precise point.

Absolute accuracy

1 The ability to determine present position in space independently, and is most often used by pilots.

2 The ability to determine present position in space independently, and is most often used by pilots.

5 The ability to determine present position in space independently, and is most often used by pilots.

Absolute altitude

1 The vertical distance of an airplane above the terrain or above ground level AGL.

2 The actual distance between an aircraft and the terrain over which it is flying.

5 The actual distance between an aircraft and the terrain over which it is flying.

Abstractions

7 Words that are general rather than specific. Aircraft is an abstraction; airplane is less abstract; jet is more specific; and jet airliner is still more specific.

Absolute ceiling

1 The altitude at which a climb is no longer possible.

Absolute pressure

2 Pressure measured from the reference of zero pressure, or a vacuum.

5 Pressure measured from the reference of zero pressure, or a vacuum.

A.C.

2 Alternating current.

5 Alternating current.

Acceleration

2 Force involved in overcoming inertia, and which may be defined as a change in velocity per unit of time.

Acceleration error

2 A magnetic compass error apparent when the aircraft accelerates while flying on an easterly or westerly heading, causing the compass card to rotate toward North.

5 A magnetic compass error apparent when the aircraft accelerates while flying on an easterly or westerly heading, causing the compass card to rotate toward North.

Accelerate-go distance

1 The distance required to accelerate to V1 with all engines at takeoff power, experience an engine failure at V1 and continue the takeoff on the remaining engine(s). The runway required includes the distance required to climb to 35 feet by which time

2 The distance required to accelerate to V1 with all engines at takeoff power, experience an engine failure at V1, and continue the takeoff on the remaining engine(s). The runway required includes the distance required to climb to 35 feet by which time

Accelerate-stop distance

1 The distance required to accelerate to V1 with all engines at takeoff power, experience an engine failure at V1, and abort the takeoff and bring the airplane to a stop using braking action only (use of thrust reversing is not considered).

2 The distance required to accelerate to V1 with all engines at takeoff power, experience an engine failure at V1, and abort the takeoff and bring the airplane to a stop using braking action only (use of thrust reversing is not considered).

Accelerate-Stop Distance Available (ASDA)

4 The runway plus stopway length declared available and suitable for the acceleration and deceleration of an airplane aborting a takeoff.

Acceleration

2 Force involved in overcoming inertia, and which may be defined as a change in velocity per unit of time.

Accelerometer

2 A part of an inertial navigation system (INS) that accurately measures the force of acceleration in one direction.

5 A part of an inertial navigation system (INS) that accurately measures the force of acceleration in one direction.

Accessories

1 Components that are used with an engine, but are not a part of the engine itself. Units such as magnetos, carburetors, generators, and fuel pumps are commonly installed engine accessories.

ADC

2 See air data computer.

ADF

2 See automatic direction finder.

5 See automatic direction finder.

Adjustable stabilizer

1 A stabilizer that can be adjusted in flight to trim the airplane, thereby allowing the airplane to fly hands-off at any given airspeed.

ADI

2 See attitude director indicator.

5 See attitude director indicator.

Adiabatic cooling

2 A process of cooling the air through expansion. For example, as air moves up slope it expands with the reduction of atmospheric pressure and cools as it expands.

Adiabatic heating

2 A process of heating dry air through compression. For example, as air moves down a slope it is compressed, which results in an increase in temperature.

Adjustable-pitch propeller

2 A propeller with blades whose pitch can be adjusted on the ground with the engine not running, but which cannot be adjusted in flight. Also referred to as a ground adjustable propeller. Sometimes also used to refer to constant-speed propellers that a

Adjustable stabilizer

2 A stabilizer that can be adjusted in flight to trim the airplane, thereby allowing the airplane to fly hands-off at any given airspeed.

ADM

2 See aeronautical decision-making.

5 See aeronautical decision-making.

ADS-B

2 See automatic dependent surveillance–broadcast.

5 See automatic dependent surveillance-broadcast.

Advanced Surface Movement Guidance and Control System (A-SMGCS)

4 A system providing routing, guidance and surveillance for the control of aircraft and vehicles, in order to maintain the declared surface movement rate under all weather conditions within the aerodrome visibility operational level (AVOL) while maintaining the required level of safety.

Advection fog

5 Fog resulting from the movement of warm, humid air over a cold surface.

Adverse yaw

1 A condition of flight in which the nose of an airplane tends to yaw toward the outside of the turn. This is caused by the higher induced drag on the outside wing, which is also producing more lift. Induced drag is a by-product of the lift associated

2 A flight condition at the beginning of a turn in which the nose of the aircraft starts to move in the direction opposite the direction the turn is being made, caused by the induced drag produced by the downward-deflected aileron holding back the wing

5 A flight condition at the beginning of a turn in which the nose of the aircraft starts to move in the direction opposite the direction the turn is being made, caused by the induced drag produced by the downward-deflected aileron holding back the wing as it begins to rise.

Aerodynamic ceiling

1 The point (altitude) at which, as the indicated airspeed decreases with altitude, it progressively merges with the low speed buffet boundary where pre-stall buffet occurs for the airplane at a load factor of 1.0 G.

Aerodynamics

1 The science of the action of air on an object, and with the motion of air on other gases. Aerodynamics deals with the production of lift by the aircraft, the relative wind, and the atmosphere.

2 The science of the action of air on an object, and with the motion of air on other gases. Aerodynamics deals with the production of lift by the aircraft, the relative wind, and the atmosphere.

Aeronautical chart

2 A map used in air navigation containing all or part of the following: topographic features, hazards and obstructions, navigation aids, navigation routes, designated airspace, and airports.

Aeronautical decision-making (ADM)

2 A systematic approach to the mental process used by pilots to consistently determine the best course of action in response to a given set of circumstances.

5 A systematic approach to the mental process used by pilots to consistently determine the best course of action in response to a given set of circumstances.

7 A systematic approach to the mental process used by aircraft pilots to consistently determine the best course of action in response to a given set of circumstances.

A/FD

2 See Airport/Facility Directory.

5 See Airport/Facility Directory.

Affective domain

7 A grouping of levels of learning associated with a person’s attitudes, personal beliefs, and values which range from receiving through responding, valuing, and organization to characterization.

Agonic line

2 An irregular imaginary line across the surface of the Earth along which the magnetic and geographic poles are in alignment, and along which there is no magnetic variation.

5 An irregular imaginary line across the surface of the Earth along which the magnetic and geographic poles are in alignment, and along which there is no magnetic variation.

Ailerons

1 Primary flight control surfaces mounted on the trailing edge of an airplane wing, near the tip. Ailerons control roll about the longitudinal axis.

2 Primary flight control surfaces mounted on the trailing edge of an airplane wing, near the tip. Ailerons control roll about the longitudinal axis.

12 The hinged portion of the trailing edge of the outer wing used to bank or roll around the longitudinal axis.

Aircraft

2 A device that is used, or intended to be used, for flight.

Aircraft altitude

2 The actual height above sea level at which the aircraft is flying.

Aircraft approach category

2 A performance grouping of aircraft based on a speed of 1.3 times the stall speed in the landing configuration at maximum gross landing weight.

4 A grouping of aircraft based on reference landing speed (VREF), if specified, or if VREF is not specified, 1.3 VSO (the stalling speed or minimum steady flight speed in the landing configuration) at the maximum certificated landing weight.

5 A performance grouping of aircraft based on a speed of 1.3 times the stall speed in the landing configuration at maximum gross landing weight.

Aircraft checkouts

7 An instructional program designed to familiarize and qualify a pilot to act as pilot in command of a particular aircraft type.

Aircraft energy management

1 The process of planning, monitoring and controlling altitude and airspeed in relation to the airplane’s energy state. Note that this definition is concerned with managing mechanical energy (altitude and airspeed) and addresses the safety (flight cont

Aircraft logbooks

1 Journals containing a record of total operating time, repairs, alterations or inspections performed, and all Airworthiness Directive (AD) notes complied with. A maintenance logbook should be kept for the airframe, each engine, and each propeller.

Air data computer (ADC)

2 An aircraft computer that receives and processes pitot pressure, static pressure, and temperature to calculate very precise altitude, indicated airspeed, true airspeed, and air temperature.

5 An aircraft computer that receives and processes pitot pressure, static pressure, and temperature to calculate very precise altitude, indicated airspeed, true airspeed, and air temperature.

Air density

12 The mass of air per unit volume.

Airfoil

1 An airfoil is any surface, such as a wing, propeller, rudder, or even a trim tab, which provides aerodynamic force when it interacts with a moving stream of air.

2 Any surface, such as a wing, propeller, rudder, or even a trim tab, which provides aerodynamic force when it interacts with a moving stream of air.

12 The surfaces on a glider that produce lift.

Airmanship

1 A sound acquaintance with the principles of flight, the ability to operate an airplane with competence and precision both on the ground and in the air, and the exercise of sound judgment that results in optimal operational safety and efficiency.

Airman Certification Standards (ACS)

7 An FAA published list of standards which must be met for the issuance of a particular pilot certificate or rating. FAA inspectors and designated pilot examiners use these standards when conducting pilot practical tests and flight instructors should use the ACS while preparing applicants for practical tests.

Air mass

2 An extensive body of air having fairly uniform properties of temperature and moisture.

12 A widespread mass of air having similar characteristics (e.g., temperature), that usually helps to identify the source region of the air. Fronts are distinct boundaries between air masses.

AIRMET

2 Inflight weather advisory issued as an amendment to the area forecast, concerning weather phenomena of operational interest to all aircraft and that is potentially hazardous to aircraft with limited capability due to lack of equipment, instrumentatio

5 Inflight weather advisory issued as an amendment to the area forecast, concerning weather phenomena of operational interest to all aircraft and that is potentially hazardous to aircraft with limited capability due to lack of equipment, instrumentation, or pilot qualifications.

Airplane

2 An engine-driven, fixed-wing aircraft heavier than air that is supported in flight by the dynamic reaction of air against its wings.

Airplane Flight Manual (AFM)

1 A document developed by the airplane manufacturer and approved by the Federal Aviation Administration (FAA). It is specific to a particular make and model airplane by serial number and it contains operating procedures and limitations.

2 A document developed by the airplane manufacturer and approved by the Federal Aviation Administration (FAA). It is specific to a particular make and model airplane by serial number and it contains operating procedures and limitations.

Airplane Owner/Information Manual

1 A document developed by the airplane manufacturer containing general information about the make and model of an airplane. The airplane owner’s manual is not FAA-approved and is not specific to a particular serial numbered airplane. This manual is not

2 A document developed by the airplane manufacturer containing general information about the make and model of an airplane. The airplane owner’s manual is not FAA approved and is not specific to a particular serial numbered airplane. This manual is not

Airport diagram

2 The section of an instrument approach procedure chart that shows a detailed diagram of the airport. This diagram includes surface features and airport configuration information.

4 A full-page depiction of the airport that includes the same features of the airport sketch plus additional details, such as taxiway identifiers, airport latitude and longitude, and building identification. Airport diagrams are located in the U.S. Terminal Procedures booklet following the instrument approach charts for a particular airport.

5 The section of an instrument approach procedure chart that shows a detailed diagram of the airport. This diagram includes surface features and airport configuration information.

Airport/Facility Directory (A/FD)

2 See Chart Supplement U.S.

4 Section within the Chart Supplement regional booklets published by Aeronautical Information Services that provides information about all airports in the region. The A/FD section includes runway length and width, runway surface, load bearing capacity, runway slope, airport services, and hazards, such as birds and reduced visibility.

5 An FAA publication containing information on all airports, communications, and NAVAIDs.

Airport Sketch

4 Depicts the runways and their length, width, and slope, the touchdown zone elevation, the lighting system installed on the end of the runway, and taxiways. Airport sketches are located on the lower left or right portion of the instrument approach chart.

Airport surface detection equipment (ASDE)

2 Radar equipment specifically designed to detect all principal features and traffic on the surface of an airport, presenting the entire image on the control tower console; used to augment visual observation by tower personnel of aircraft and/or vehicu

5 Radar equipment specifically designed to detect all principal features and traffic on the surface of an airport, presenting the entire image on the control tower console; used to augment visual observation by tower personnel of aircraft and/or vehicular movements on runways and taxiways.

Airport Surface Detection Equipment-Model X (ASDE-X)

4 Enables air traffic controllers to detect potential runway conflicts by providing detailed coverage of movement on runways and taxiways. By collecting data from a variety of sources, ASDE-X is able to track vehicles and aircraft on the airport movement area and obtain identification information from aircraft transponders.

Airport surveillance radar (ASR)

2 Approach control radar used to detect and display an aircraft’s position in the terminal area.

5 Approach control radar used to detect and display an aircraft’s position in the terminal area.

Airport surveillance radar approach

2 An instrument approach in which ATC issues instructions for pilot compliance based on aircraft position in relation to the final approach course and the distance from the end of the runway as displayed on the controller’s radar scope.

5 An instrument approach in which ATC issues instructions for pilot compliance based on aircraft position in relation to the final approach course and the distance from the end of the runway as displayed on the controller’s radar scope.

Air route surveillance radar (ARSR)

2 Air route traffic control center (ARTCC) radar used primarily to detect and display an aircraft’s position while en route between terminal areas.

5 Air route traffic control center (ARTCC) radar used primarily to detect and display an aircraft’s position while en route between terminal areas.

Air route traffic control center (ARTCC)

2 Provides ATC service to aircraft operating on IFR flight plans within controlled airspace and principally during the en route phase of flight.

4 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

5 Provides ATC service to aircraft operating on IFR flight plans within controlled airspace and principally during the en route phase of flight.

Airspeed

2 Rate of the aircraft’s progress through the air.

Airspeed indicator

2 A differential pressure gauge that measures the dynamic pressure of the air through which the aircraft is flying. Displays the craft’s airspeed, typically in knots, to the pilot.

5 A differential pressure gauge that measures the dynamic pressure of the air through which the aircraft is flying. Displays the craft’s airspeed, typically in knots, to the pilot.

Air start

1 The act or instance of starting an aircraft’s engine while in flight, especially a jet engine after flameout.

Air traffic control (ATC)

7 A service provided by the FAA to promote the safe, orderly, and expeditious flow of air traffic.

Air traffic control radar beacon system (ATCRBS)

2 Sometimes called secondary surveillance radar (SSR), which utilizes a transponder in the aircraft. The ground equipment is an interrogating unit, in which the beacon antenna is mounted so it rotates with the surveillance antenna. The interrogating un

5 Sometimes called secondary surveillance radar (SSR), which utilizes a transponder in the aircraft. The ground equipment is an interrogating unit, in which the beacon antenna is mounted so it rotates with the surveillance antenna. The interrogating unit transmits a coded pulse sequence that actuates the aircraft transponder. The transponder answers the coded sequence by transmitting a preselected coded sequence back to the ground equipment, providing a strong return signal and positive aircraft i

Air Traffic Service (ATS)

4 Air traffic service is an ICAO 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).

Airway

2 An airway is based on a centerline that extends from one navigation aid or intersection to another navigation aid (or through several navigation aids or intersections); used to establish a known route for en route procedures between terminal areas.

5 An airway is based on a centerline that extends from one navigation aid or intersection to another navigation aid (or through several navigation aids or intersections); used to establish a known route for en route procedures between terminal areas.

Airworthiness

1 A condition in which the aircraft conforms to its type certificated design including supplemental type certificates and field-approved alterations. The aircraft must also be in a condition for safe flight as determined by annual, 100-hour, preflight

Airworthiness Certificate

1 A certificate issued by the FAA to all aircraft that have been proven to meet the minimum standards set down by the Code of Federal Regulations.

2 A certificate issued by the FAA to all aircraft that have been proven to meet the minimum standards set down by the Code of Federal Regulations.

Airworthiness Directive

1 A regulatory notice sent out by the FAA to the registered owner of an aircraft informing the owner of a condition that prevents the aircraft from continuing to meet its conditions for airworthiness. Airworthiness Directives (AD) must be complied with

2 A regulatory notice sent out by the FAA to the registered owner of an aircraft informing the owner of a condition that prevents the aircraft from continuing to meet its conditions for airworthiness. Airworthiness Directives (AD notes) are to be compl

Alert area

2 An area in which there is a high volume of pilot training or an unusual type of aeronautical activity.

5 An area in which there is a high volume of pilot training or an unusual type of aeronautical activity.

Almanac data

2 Information the global positioning system (GPS) receiver can obtain from one satellite which describes the approximate orbital positioning of all satellites in the constellation. This information is necessary for the GPS receiver to know what satelli

5 Information the global positioning system (GPS) receiver can obtain from one satellite which describes the approximate orbital positioning of all satellites in the constellation. This information is necessary for the GPS receiver to know what satellites to look for in the sky at a given time.

Alpha mode of operation

1 The operation of a turboprop engine that includes all of the flight operations, from takeoff to landing. Alpha operation is typically between 95 percent to 100 percent of the engine operating speed.

2 The operation of a turboprop engine that includes all of the flight operations, from takeoff to landing. Alpha operation is typically between 95 percent to 100 percent of the engine operating speed.

ALS

2 See approach lighting system

5 See approach lighting system.

Alternate air

1 A device which opens, either automatically or manually, to allow induction airflow to continue should the primary induction air opening become blocked.

2 A device which opens, either automatically or manually, to allow induction airflow to continue should the primary induction air opening become blocked.

Alternate airport

2 An airport designated in an IFR flight plan, providing a suitable destination if a landing at the intended airport becomes inadvisable.

5 An airport designated in an IFR flight plan, providing a suitable destination if a landing at the intended airport becomes inadvisable.

Alternate static source

1 A manual port that when opened allows the pitot static instruments to sense static pressure from an alternate location should the primary static port become blocked.

2 A manual port that when opened allows the pitot static instruments to sense static pressure from an alternate location should the primary static port become blocked.

Alternate static source valve.

2 A valve in the instrument static air system that supplies reference air pressure to the altimeter, airspeed indicator, and vertical speed indicator if the normal static pickup should become clogged or iced over.

5 A valve in the instrument static air system that supplies reference air pressure to the altimeter, airspeed indicator, and vertical speed indicator if the normal static pickup should become clogged or iced over.

Alternator/generator

1 A device that uses engine power to generate electrical power.

2 A device that uses engine power to generate electrical power.

Altimeter

1 A flight instrument that indicates altitude by sensing pressure changes.

2 A flight instrument that indicates altitude by sensing pressure changes.

Altimeter setting

2 Station pressure (the barometric pressure at the location the reading is taken) which has been corrected for the height of the station above sea level.

5 Station pressure (the barometric pressure at the location the reading is taken) which has been corrected for the height of the station above sea level.

Altitude (AGL)

1 The actual height above ground level (AGL) at which the aircraft is flying.

Altitude (MSL)

1 The actual height above mean sea level (MSL) at which the aircraft is flying.

Altitude chamber

1 A device that simulates high altitude conditions by reducing the interior pressure. The occupants will suffer from the same physiological conditions as flight at high altitude in an unpressurized aircraft.

Altitude engine

1 A reciprocating aircraft engine having a rated takeoff power that is producible from sea level to an established higher altitude.

2 A reciprocating aircraft engine having a rated takeoff power that is producible from sea level to an established higher altitude.

Ambient pressure

2 The pressure in the area immediately surrounding the aircraft.

Ambient temperature

2 The temperature in the area immediately surrounding the aircraft.

AME

2 See aviation medical examiner.

5 See aviation medical examiner.

Amendment status

2 The circulation date and revision number of an instrument approach procedure, printed above the procedure identification.

5 The circulation date and revision number of an instrument approach procedure, printed above the procedure identification.

Ammeter

2 An instrument installed in series with an electrical load used to measure the amount of current flowing through the load.

5 An instrument installed in series with an electrical load used to measure the amount of current flowing through the load.

Amplitude

12 In wave motion, one half the distance between the wave crest and the wave trough.

Aneroid

2 The sensitive component in an altimeter or barometer that measures the absolute pressure of the air. It is a sealed, flat capsule made of thin disks of corrugated metal soldered together and evacuated by pumping all of the air out of it.

5 The sensitive component in an altimeter or barometer that measures the absolute pressure of the air. It is a sealed, flat capsule made of thin disks of corrugated metal soldered together and evacuated by pumping all of the air out of it.

Aneroid barometer

2 An instrument that measures the absolute pressure of the atmosphere by balancing the weight of the air above it against the spring action of the aneroid.

5 An instrument that measures the absolute pressure of the atmosphere by balancing the weight of the air above it against the spring action of the aneroid.

Angle of attack

1 The acute angle between the chord line of the airfoil and the direction of the relative wind.

2 The angle of attack is the angle at which relative wind meets an airfoil. It is the angle that is formed by the chord of the airfoil and the direction of the relative wind or between the chord line and the flight path. The angle of attack changes dur

5 The acute angle formed between the chord line of an airfoil and the direction of the air striking the airfoil.

12 The angle formed between the relative wind and the chord line of the wing.

Angle of incidence

1 The angle formed by the chord line of the wing and a line parallel to the longitudinal axis of the airplane.

2 The acute angle formed between the chord line of an airfoil and the longitudinal axis of the aircraft on which it is mounted.

12 The angle between the chord line of the wing and the longitudinal axis of the glider. The angle of incidence is built into the glider by the manufacturer and cannot be adjusted by the pilot’s movements of the controls.

Anhedral

2 A downward slant from root to tip of an aircraft’s wing or horizontal tail surface.

Anti-ice

5 Preventing the accumulation of ice on an aircraft structure via a system designed for that purpose.

Anti-icing

1 The prevention of the formation of ice on a surface. Ice may be prevented by using heat or by covering the surface with a chemical that prevents water from reaching the surface. Anti-icing should not be confused with deicing, which is the removal of

2 Preventing the accumulation of ice on an aircraft structure via a system designed for that purpose.

Antiservo tab

2 An adjustable tab attached to the trailing edge of a stabilator that moves in the same direction as the primary control. It is used to make the stabilator less sensitive.

Anxiety

7 Mental discomfort that arises from the fear of anything, real or imagined. May have a potent effect on actions and the ability to learn from perceptions.

Application

7 A basic level of learning at which the individual puts something to use that has been learned and understood.

Application step

7 The third step of the teaching process, where the learner performs the procedure or demonstrates the knowledge required in the lesson. In the telling-and-doing technique of flight instruction, this step consists of the learner doing the procedure while explaining it.

Approach End of Runway (AER)

4 The first portion of the runway available for landing. If the runway threshold is displaced, use the displaced threshold latitude/longitude as the AER.

Approach Fix

4 From a database coding standpoint, an approach fix is considered to be an identifiable point in space from the intermediate fix (IF) inbound. A fix located between the initial approach fix (IAF) and the IF is considered to be associated with the approach transition or feeder route.

Approach Gate

4 An imaginary point used by ATC to vector aircraft to the final approach course. The approach gate is established along the final approach course 1 NM from the final approach fix (FAF) on the side away from the airport and is located no closer than 5 NM from the landing threshold.

Approach lighting system (ALS)

2 Provides lights that will penetrate the atmosphere far enough from touchdown to give directional, distance, and glidepath information for safe transition from instrument to visual flight.

5 Provides lights that will penetrate the atmosphere far enough from touchdown to give directional, distance, and glide path information for safe transition from instrument to visual flight.

Area chart

2 Part of the low-altitude en route chart series, this chart furnishes terminal data at a larger scale for congested areas.

5 Part of the low-altitude en route chart series, this chart furnishes terminal data at a larger scale for congested areas.

Area forecast (FA)

2 A report that gives a picture of clouds, general weather conditions, and visual meteorological conditions (VMC) expected over a large area encompassing several states.

Area of operation

7 A phase of the practical test within the Airman Certification Standards (ACS) or the Practical Test Standards (PTS).

Area navigation (RNAV)

2 Allows a pilot to fly a selected course to a predetermined point without the need to overfly ground-based navigation facilities, by using waypoints.

4 A method of navigation that permits aircraft operations on any desired course within the coverage of station referenced navigation signals or within the limits of self contained system capability.

5 Allows a pilot to fly a selected course to a predetermined point without the need to overfly ground-based navigation facilities, by using waypoints.

Arm

2 See moment arm.

ARSR

2 See air route surveillance radar.

5 See air route surveillance radar.

ARTCC

2 See air route traffic control center.

5 See air route traffic control center.

ASDE

2 See airport surface detection equipment.

5 See airport surface detection equipment.

ASOS

2 See Automated Surface Observing System.

5 See automated surface observing station.

Aspect ratio

2 Span of a wing divided by its average chord.

12 The ratio between the wing span and the mean chord of the wing.

ASR

2 See airport surveillance radar.

5 See airport surveillance radar.

Asymmetrical airfoil

12 One in which the upper camber differs from the lower camber.

Asymmetric thrust

2 Also known as P-factor. A tendency for an aircraft to yaw to the left due to the descending propeller blade on the right producing more thrust than the ascending blade on the left. This occurs when the aircraft’s longitudinal axis is in a climbing at

ATC

2 Air Traffic Control.

5 Air Traffic Control.

7 See air traffic control.

ATCRBS

2 See air traffic control radar beacon system.

5 See air traffic control radar beacon system.

ATIS

2 See automatic terminal information service.

5 See automatic terminal information service.

Atmospheric propagation delay

2 A bending of the electromagnetic (EM) wave from the satellite that creates an error in the GPS system.

5 A bending of the electromagnetic (EM) wave from the satellite that creates an error in the GPS system.

Atmospheric sounding

12 A measure of atmospheric variables aloft, usually pressure, temperature, humidity, and wind.

Atmospheric stability

12 Describes a state in which an air parcel resists vertical displacement or, once displaced (for instance by flow over a hill), tends to return to its original level.

Attitude

1 The position of an aircraft as determined by the relationship of its axes and a reference, usually the earth’s horizon.

2 A personal motivational predisposition to respond to persons, situations, or events in a given manner that can, nevertheless, be changed or modified through training as sort of a mental shortcut to decision-making.

7 A personal motivational predisposition to respond to persons, situations, or events in a given manner that can, nevertheless, be changed or modified through training as a sort of mental shortcut to decision-making.

Attitude and heading reference system (AHRS)

2 A system composed of three-axis sensors that provide heading, attitude, and yaw information for aircraft. AHRS are designed to replace traditional mechanical gyroscopic flight instruments and provide superior reliability and accuracy.

5 System composed of three-axis sensors that provide heading, attitude, and yaw information for aircraft. AHRS are designed to replace traditional mechanical gyroscopic flight instruments and provide superior reliability and accuracy.

Attitude director indicator (ADI)

2 An aircraft attitude indicator that incorporates flight command bars to provide pitch and roll commands.

5 An aircraft attitude indicator that incorporates flight command bars to provide pitch and roll commands.

Attitude indicator

1 An instrument which uses an artificial horizon and miniature airplane to depict the position of the airplane in relation to the true horizon. The attitude indicator senses roll as well as pitch, which is the up and down movement of the airplane’s nos

2 The foundation for all instrument flight, this instrument reflects the airplane’s attitude in relation to the horizon.

5 The foundation for all instrument flight, this instrument reflects the airplane’s attitude in relation to the horizon.

Attitude instrument flying

2 Controlling the aircraft by reference to the instruments rather than by outside visual cues.

5 Controlling the aircraft by reference to the instruments rather than by outside visual cues.

Attitude management

2 The ability to recognize hazardous attitudes in oneself and the willingness to modify them as necessary through the application of an appropriate antidote thought.

7 The ability to recognize one’s own hazardous attitudes and the willingness to modify them as necessary through the application of appropriate antidotal thoughts.

Authentic assessment

7 An assessment in which the learner is asked to perform real-world tasks, and demonstrate a meaningful application of skills and competencies.

Autokinesis

1 This is caused by staring at a single point of light against a dark background for more than a few seconds. After a few moments, the light appears to move on its own.

2 Nighttime visual illusion that a stationary light is moving, which becomes apparent after several seconds of staring at the light.

5 Nighttime visual illusion that a stationary light is moving, which becomes apparent after several seconds of staring at the light.

Automated Surface Observing System (ASOS)

2 Weather reporting system which provides surface observations every minute via digitized voice broadcasts and printed reports.

4 A weather observing system that provides minute-by minute weather observations, such as temperature, dew point, wind, altimeter setting, visibility, sky condition, and precipitation. Some ASOS stations include a precipitation discriminator that can differentiate between liquid and frozen precipitation.

5 Weather reporting system which provides surface observations every minute via digitized voice broadcasts and printed reports.

Automated Surface Observing System (ASOS)/Automated Weather Sensor System (AWSS)

4 The ASOS/AWSS is the primary surface weather observing system of the U.S (also see ASOS).

Automated Weather Observing System (AWOS)

2 Automated weather reporting system consisting of various sensors, a processor, a computer-generated voice subsystem, and a transmitter to broadcast weather data.

4 A suite of sensors that measure, collect, and disseminate weather data. AWOS stations provide a minute-by-minute update of weather parameters, such as wind speed and direction, temperature and dew point, visibility, cloud heights and types, precipitation, and barometric pressure. A variety of AWOS system types are available (from AWOS 1 to AWOS 3), each of which includes a different sensor array.

5 Automated weather reporting system consisting of various sensors, a processor, a computer-generated voice subsystem, and a transmitter to broadcast weather data.

Automated Weather Sensor System (AWSS)

4 The AWSS is part of the Aviation Surface Weather Observation Network suite of programs and provides pilots and other users with weather information through the Automated Surface Observing System. The AWSS sensor suite automatically collects, measures, processes, and broadcasts surface weather data.

Automated Weather System

4 Any of the automated weather sensor platforms that collect weather data at airports and disseminate the weather information via radio and/or landline. The systems currently consist of the Automated Surface Observing System (ASOS), Automated Weather Sensor System (AWSS), and Automated Weather Observation System (AWOS).

Automatic dependent surveillance—broadcast (ADS–B)

2 A function on an aircraft or vehicle that periodically broadcasts its state vector (i.e., horizontal and vertical position, horizontal and vertical velocity) and other information.

4 A surveillance system that continuously broadcasts GPS position information, aircraft identification, altitude, velocity vector, and direction to all other aircraft and air traffic control facilities within a specific area. Automatic dependent surveillance-broadcast (ADS-B) information is displayed in the flight deck via a flight deck display of traffic information (CDTI) unit, providing the pilot with greater situational awareness. ADS-B transmissions also provides controllers with a more compl

5 A device used in aircraft that repeatedly broadcasts a message that includes position (such as latitude, longitude, and altitude), velocity, and possibly other information.

Automatic direction finder (ADF)

2 Electronic navigation equipment that operates in the low- and medium-frequency bands. Used in conjunction with the ground-based nondirectional beacon (NDB), the instrument displays the number of degrees clockwise from the nose of the aircraft to the

5 Electronic navigation equipment that operates in the low- and medium-frequency bands. Used in conjunction with the ground-based nondirectional beacon (NDB), the instrument displays the number of degrees clockwise from the nose of the aircraft to the station being received.

Automatic terminal information service (ATIS)

2 The continuous broadcast of recorded non-control information in selected terminal areas. Its purpose is to improve controller effectiveness and relieve frequency congestion by automating repetitive transmission of essential but routine information.

4 A recorded broadcast available at most airports with an operating control tower that includes crucial information about runways and instrument approaches in use, specific outages, and current weather conditions, including visibility.

5 The continuous broadcast of recorded non-control information in selected terminal areas. Its purpose is to improve controller effectiveness and relieve frequency congestion by automating repetitive transmission of essential but routine information.

Autopilot

1 An automatic flight control system which keeps an aircraft in level flight or on a set course. Automatic pilots can be directed by the pilot, or they may be coupled to a radio navigation signal.

2 An automatic flight control system which keeps an aircraft in level flight or on a set course. Automatic pilots can be directed by the pilot, or they may be coupled to a radio navigation signal.

Advection

12 The transport of an atmospheric variable due to mass motion by the wind. Usually the term as used in meteorology refers only to horizontal transport.

Aviation medical examiner (AME)

2 A physician with training in aviation medicine designated by the Civil Aerospace Medical Institute (CAMI).

5 A physician with training in aviation medicine designated by the Civil Aerospace Medical Institute (CAMI).

Aviation Routine Weather Report (METAR)

2 Observation of current surface weather reported in a standard international format.

AWOS

2 See Automated Weather Observing System.

5 See automated weather observing system.

Axes of an aircraft

1 Three imaginary lines that pass through an aircraft’s center of gravity. The axes can be considered as imaginary axles around which the aircraft turns. The three axes pass through the center of gravity at 90° angles to each other. The axis from nose

2 Three imaginary lines that pass through an aircraft’s center of gravity. The axes can be considered as imaginary axles around which the aircraft rotates. The three axes pass through the center of gravity at 90° angles to each other. The axis from nos

Axial flow compressor

1 A type of compressor used in a turbine engine in which the airflow through the compressor is essentially linear. An axial-flow compressor is made up of several stages of alternate rotors and stators. The compressor ratio is determined by the decrease

2 A type of compressor used in a turbine engine in which the airflow through the compressor is essentially linear. An axial-flow compressor is made up of several stages of alternate rotors and stators. The compressor ratio is determined by the decrease

Azimuth card

2 A card that may be set, gyroscopically controlled, or driven by a remote compass.

5 A card that may be set, gyroscopically controlled, or driven by a remote compass.