Aviation Glossary

Over 200 aviation terms, acronyms, and definitions every student pilot needs to know. From ACS to Zulu time, this is your go-to reference for flight training.

211+ TermsA-Z OrganizedSearchable
A
19 terms
ACS
Airman Certification Standards. The FAA document that outlines the knowledge, risk management, and skill standards for each pilot certificate and rating.
ADM
Aeronautical Decision Making. A systematic approach to the mental process used by pilots to determine the best course of action in a given set of circumstances.
ADF
Automatic Direction Finder. A radio navigation instrument that determines the bearing from the aircraft to a ground-based non-directional beacon (NDB).
ADIZ
Air Defense Identification Zone. An area of airspace over land or water in which the identification, location, and control of civil aircraft is required for national security.
AGL
Above Ground Level. An altitude measurement referenced from the ground directly below the aircraft rather than from sea level.
AIRMETs
Airmen's Meteorological Information. In-flight weather advisories for conditions that may affect the safety of aircraft operations, including moderate icing, turbulence, and low visibility.
Airspeed Indicator
A flight instrument that displays the aircraft's speed through the air by measuring the difference between pitot (ram) air pressure and static air pressure.
Airworthiness Certificate
An FAA document certifying that an aircraft meets its type design and is in a condition for safe operation. It must be displayed in the aircraft at all times.
Altimeter
A flight instrument that measures the aircraft's altitude above a given pressure datum by sensing atmospheric pressure changes. Pilots set the local altimeter setting (Kollsman window) for accurate readings.
Angle of Attack
The angle between the chord line of the wing and the relative wind. Exceeding the critical angle of attack causes the wing to stall regardless of airspeed or attitude.
AOPA
Aircraft Owners and Pilots Association. The world's largest civil aviation organization, providing advocacy, education, and resources for general aviation pilots.
ARROW
A mnemonic for the documents required to be on board an aircraft: Airworthiness certificate, Registration, Radio station license (if applicable), Operating limitations (POH), and Weight and balance data.
ATC
Air Traffic Control. A service provided by ground-based controllers who direct aircraft on the ground and in controlled airspace to maintain safe separation between aircraft.
ATIS
Automatic Terminal Information Service. A continuous broadcast of recorded non-control aeronautical information at airports, updated hourly or when conditions change significantly.
Attitude Indicator
Also called the artificial horizon. A gyroscopic flight instrument that shows the aircraft's pitch and bank attitude relative to the horizon, essential for instrument flight.
Autopilot
An electronic system that automatically controls the aircraft's flight path without constant hands-on control from the pilot. Modes may include heading hold, altitude hold, and navigation tracking.
Aileron
A hinged flight control surface on the trailing edge of each wing that controls roll (banking). Moving the yoke or stick left raises the left aileron and lowers the right, rolling the aircraft left.
Avionics
The electronic systems used in aircraft, including communication radios, navigation equipment, flight displays, transponders, and autopilot systems.
Airway
A defined corridor of airspace between navigation aids, designated for en route IFR navigation. Victor airways (below 18,000 feet) and Jet routes (above 18,000 feet) are the two types.
B
8 terms
Baron
The Beechcraft Baron, a popular twin-engine piston aircraft used for personal and business flying. Known for its speed, range, and reliability.
Base Leg
A flight path at right angles to the landing runway and off its approach end, forming part of the standard traffic pattern. The turn from base to final aligns the aircraft with the runway.
BECMN
Becoming. A term used in aviation weather forecasts (TAFs) to indicate a gradual or permanent change in weather conditions expected during a specific time period.
Bernoulli's Principle
A fundamental principle of aerodynamics stating that as the velocity of a fluid (air) increases, its pressure decreases. This helps explain how lift is generated over a wing.
Best Angle of Climb (Vx)
The airspeed that produces the greatest gain in altitude over the shortest horizontal distance. Used for obstacle clearance after takeoff.
Best Rate of Climb (Vy)
The airspeed that produces the greatest gain in altitude per unit of time. Used for normal climbs to reach cruise altitude efficiently.
Blocked
A radio communication term indicating that a transmission was cut off or unintelligible because two or more people transmitted simultaneously on the same frequency.
Bravo Airspace
Class B airspace surrounding the nation's busiest airports. It requires an ATC clearance to enter, a two-way radio, an operating transponder with Mode C, and specific pilot certification.
C
27 terms
CAT
Clear Air Turbulence. Turbulence that occurs in clear skies without visual clues such as clouds, often found near the jet stream at high altitudes.
CDI
Course Deviation Indicator. A needle on a VOR or GPS display that shows whether the aircraft is left or right of the desired course centerline.
Ceiling
The height above ground level of the lowest layer of clouds that covers more than half the sky (broken or overcast). Ceilings are reported in METARs and affect VFR flight.
Center of Gravity
The point at which the aircraft's total weight is considered to be concentrated. It must remain within approved limits for safe and controllable flight.
Cessna
An American aircraft manufacturer known for producing popular general aviation aircraft, including the Cessna 172 Skyhawk, the most produced aircraft in history.
CFI
Certified Flight Instructor. A pilot who holds an instructor certificate and is authorized to provide flight training and endorse student pilots for solo and checkride.
Charlie Airspace
Class C airspace surrounding airports with an operational control tower and radar approach control. It requires two-way radio communication and a transponder with Mode C.
Checklist
A written or electronic list of tasks and procedures that a pilot must complete during each phase of flight to ensure nothing critical is overlooked for safe operation.
Circuit Breaker
A resettable electrical protection device in an aircraft that automatically interrupts current flow when it exceeds a safe level, protecting aircraft systems and wiring.
Class A Airspace
Airspace from 18,000 feet MSL up to flight level 600. All operations must be under IFR, and pilots must have an instrument rating and ATC clearance.
Class B Airspace
Controlled airspace surrounding the busiest airports in the country, typically from the surface to 10,000 feet MSL. Requires ATC clearance, radio, transponder, and specific pilot qualifications.
Class C Airspace
Controlled airspace around airports with an operating control tower and radar service, typically extending from the surface to 4,000 feet AGL. Two-way radio contact is required.
Class D Airspace
Controlled airspace around airports with an operating control tower, typically from the surface to 2,500 feet AGL. Requires establishing two-way radio communication before entry.
Class E Airspace
Controlled airspace that is not Class A, B, C, or D. It provides separation for IFR aircraft and generally starts at 700 or 1,200 feet AGL, or at the surface near some airports.
Class G Airspace
Uncontrolled airspace where ATC does not exercise authority over air traffic. Pilots must still follow VFR weather minimums and right-of-way rules.
Clearance
An authorization from ATC allowing an aircraft to proceed under specified conditions. Pilots must read back the clearance to confirm accuracy.
Climb
A flight maneuver in which the aircraft gains altitude. Climb performance depends on excess thrust (power available minus power required) and aircraft weight.
CFIT
Controlled Flight Into Terrain. An accident where an airworthy aircraft is unintentionally flown into the ground, water, or an obstacle. It is one of the leading causes of fatal aviation accidents.
Cockpit
The section of the aircraft where the pilot and crew operate the flight controls, instruments, and avionics. Also called the flight deck in larger aircraft.
Common Traffic Advisory Frequency (CTAF)
A radio frequency designated for pilots to announce their position and intentions at non-towered airports. It helps maintain situational awareness and traffic separation.
Controlled Airspace
Airspace of defined dimensions within which ATC services are provided. It includes Class A, B, C, D, and E airspace. IFR and some VFR flights must follow ATC instructions.
Convective SIGMET
A weather advisory for severe thunderstorms, tornadoes, embedded thunderstorms, lines of thunderstorms, and hail 3/4 inch or larger. It implies severe or greater turbulence, icing, and low-level wind shear.
Coordinated Turn
A turn in which the proper amount of rudder is applied to counteract adverse yaw so the ball in the inclinometer stays centered. The occupants feel no lateral force.
Crab
A crosswind correction technique in which the aircraft's nose is pointed into the wind to maintain a desired ground track. The aircraft's heading differs from its course.
Cross-Country
A flight of more than 50 nautical miles from the original point of departure, landing at a different airport. Cross-country time is required for pilot certificate milestones.
Crosswind
A wind component blowing perpendicular to the aircraft's direction of travel. Pilots use crosswind correction techniques during takeoff, landing, and cruise flight.
Carburetor Heat
A system that routes heated air to the carburetor to prevent or remove ice formation. Applied when reduced power or high humidity conditions may cause carburetor icing.
D
8 terms
Dead Reckoning
A navigation method in which the pilot calculates position by applying heading, speed, time, and wind correction from a known starting point. Also called deductive reckoning.
Density Altitude
Pressure altitude corrected for non-standard temperature. It is the altitude at which the aircraft 'feels' it is flying and directly affects engine and aerodynamic performance.
Departure
The initial phase of flight after takeoff, including climb-out and transition to the en route phase. Departure procedures help ensure obstacle clearance and traffic separation.
DPE
Designated Pilot Examiner. A person authorized by the FAA to conduct practical tests (checkrides) for pilot certificates and ratings on behalf of the FAA.
DUATS
Direct User Access Terminal System. A service that provides pilots with weather briefings and the ability to file flight plans electronically via the internet.
Downwind
The leg of the traffic pattern that runs parallel to the runway in the opposite direction of landing. Pilots configure the aircraft for approach during this leg.
Drag
The aerodynamic force opposing an aircraft's motion through the air. The four types are parasite, induced, form, and skin friction drag.
Density Altitude Effect
The impact of density altitude on aircraft performance. High density altitude (hot, high, humid conditions) reduces engine power, propeller efficiency, and wing lift, degrading takeoff and climb performance.
E
9 terms
EGT
Exhaust Gas Temperature. An engine instrument that measures the temperature of exhaust gases leaving the cylinders. Used to set the fuel-air mixture for efficient operation.
ELT
Emergency Locator Transmitter. A device carried aboard aircraft that transmits a distress signal on 121.5 MHz and 406 MHz after a crash to aid in search and rescue.
Emergency Locator Transmitter
A battery-powered device that automatically activates upon impact, transmitting a signal on emergency frequencies so that search and rescue teams can locate a downed aircraft.
Empennage
The tail assembly of an aircraft, including the vertical stabilizer (fin), rudder, horizontal stabilizer, and elevator. It provides stability and directional control.
Endurance
The maximum length of time an aircraft can remain airborne on a given amount of fuel. It is maximized at the airspeed that results in minimum fuel flow.
Engine Failure
A partial or complete loss of engine power during flight. Pilots train for this emergency by practicing engine-out procedures, identifying suitable landing sites, and maintaining best-glide airspeed.
En Route
The phase of flight between departure and arrival, during which the aircraft is cruising along its planned route. En route navigation may use VORs, GPS, or airways.
ETA
Estimated Time of Arrival. The calculated time at which the aircraft is expected to reach a destination or waypoint, based on distance, groundspeed, and departure time.
Elevator
The movable control surface on the trailing edge of the horizontal stabilizer that controls pitch (nose up or down). It is operated by pushing or pulling the yoke.
F
11 terms
FAA
Federal Aviation Administration. The U.S. government agency responsible for regulating civil aviation, including pilot certification, airworthiness standards, and air traffic control.
FAR
Federal Aviation Regulations. The rules in Title 14 of the Code of Federal Regulations (14 CFR) that govern all aviation activities in the United States.
FBO
Fixed-Base Operator. A commercial business at an airport that provides services such as fuel, parking, hangar rental, flight training, and aircraft maintenance.
Final Approach
The last segment of the traffic pattern or instrument approach in which the aircraft is aligned with the runway and descending to land.
Flaps
Hinged surfaces on the trailing edge of the wing that increase both lift and drag when extended. Flaps allow slower approach speeds and steeper descent angles.
Flight Level
An altitude expressed in hundreds of feet above the standard pressure datum of 29.92 inHg. Flight Level 350, for example, represents 35,000 feet. Used at or above 18,000 feet MSL.
Flight Plan
A formal document filed with ATC or FSS that describes the intended route, altitude, airspeed, and other details of a flight. Required for IFR flights and recommended for VFR.
Flight Review
A review of pilot competency required every 24 calendar months by 14 CFR 61.56. It consists of at least one hour of ground training and one hour of flight training with a CFI.
FSS
Flight Service Station. An FAA facility that provides pilot briefings, flight plan services, en route radio communications, search and rescue coordination, and weather information.
Fuel Drain
A valve or sampling point on the aircraft used during preflight to draw fuel samples for checking quality, color, and the absence of water or contaminants.
Fuselage
The central body of an aircraft that houses the cockpit, cabin, passengers, and cargo. It connects the wings, tail, and landing gear.
G
9 terms
Glass Cockpit
An aircraft instrument panel that uses electronic flight displays (LCD or LED screens) instead of traditional analog gauges. Common systems include the Garmin G1000.
Glide Ratio
The ratio of horizontal distance traveled to altitude lost during a power-off glide. A glide ratio of 9:1 means the aircraft travels 9 units forward for every 1 unit of altitude lost.
Go-Around
A procedure in which the pilot abandons a landing approach and climbs to re-enter the traffic pattern for another attempt. Initiated when the approach becomes unstable or unsafe.
GPS
Global Positioning System. A satellite-based navigation system that provides precise position, velocity, and time information to aircraft receivers for en route and approach navigation.
Ground Effect
A condition of improved aircraft performance that occurs when flying within approximately one wingspan of the ground. Lift increases and induced drag decreases near the surface.
Ground Speed
The speed of an aircraft relative to the ground. It equals true airspeed adjusted for the wind component along the aircraft's track.
GUMPS
A pre-landing checklist mnemonic: Gas (fuel on proper tank), Undercarriage (landing gear down), Mixture (rich), Propeller (set for go-around), Seatbelts and Switches.
Gust
A sudden, brief increase in wind speed. Gusts are reported in METARs when the peak wind exceeds the average by 10 knots or more, and they affect aircraft control during takeoff and landing.
Groundspeed
The horizontal speed of an aircraft relative to the earth's surface, equal to true airspeed corrected for wind. Used to calculate time en route and fuel burn.
H
6 terms
Heading Indicator
Also called the directional gyro (DG). A gyroscopic instrument that shows the aircraft's magnetic heading. It must be periodically aligned with the magnetic compass.
Headwind
A wind blowing opposite to the aircraft's direction of travel. Headwinds reduce groundspeed but shorten takeoff and landing rolls.
Holding Pattern
A racetrack-shaped flight path used to delay an aircraft in a specific area while waiting for further ATC clearance. Standard patterns use right-hand turns.
Horizontal Stabilizer
The fixed or adjustable horizontal surface on the empennage that provides longitudinal (pitch) stability. The elevator is attached to its trailing edge.
HSI
Horizontal Situation Indicator. A cockpit instrument that combines a heading indicator with a VOR/ILS course deviation indicator, providing a comprehensive display of lateral navigation.
Hypoxia
A condition resulting from insufficient oxygen reaching body tissues. Symptoms include impaired judgment, euphoria, and loss of consciousness. Supplemental oxygen is required above 12,500 feet.
I
7 terms
IAS
Indicated Airspeed. The airspeed shown on the airspeed indicator without correction for instrument error, position error, temperature, or altitude.
IFR
Instrument Flight Rules. A set of regulations and procedures for flying when visibility is below VFR minimums. IFR pilots navigate using instruments and ATC guidance.
ILS
Instrument Landing System. A precision approach system that provides lateral (localizer) and vertical (glide slope) guidance to the runway, enabling landings in low-visibility conditions.
IMSAFE
A personal fitness checklist mnemonic: Illness, Medication, Stress, Alcohol, Fatigue, and Emotion. Pilots use it before every flight to assess their fitness to fly.
Indicated Altitude
The altitude read directly from the altimeter when it is set to the current local altimeter setting. It is the standard reference for maintaining assigned altitudes below 18,000 feet.
Instrument Approach
A series of predetermined maneuvers using flight instruments for orderly descent from the en route phase to a point near the runway in IMC. Types include ILS, VOR, GPS, and NDB approaches.
Isogonic Line
A line drawn on a chart connecting points of equal magnetic variation. Pilots use these to correct between true and magnetic heading during navigation planning.
J
1 term
Jet Stream
A narrow band of high-speed winds, typically found between 30,000 and 40,000 feet, flowing from west to east. Wind speeds can exceed 100 knots and significantly affect flight planning.
K
4 terms
KIAS
Knots Indicated Airspeed. Airspeed as shown on the instrument, measured in nautical miles per hour (knots), uncorrected for installation or compressibility errors.
KTAS
Knots True Airspeed. The actual speed of the aircraft through the air mass, corrected for altitude and temperature. Used for flight planning and navigation calculations.
Knot
A unit of speed equal to one nautical mile per hour (approximately 1.15 statute miles per hour). Knots are the standard unit of speed in aviation and marine navigation.
KOEL
Kinds of Operations Equipment List. A section of the POH that specifies the minimum equipment required for day VFR, night VFR, day IFR, and night IFR operations.
L
8 terms
Landing Gear
The undercarriage of an aircraft, including wheels, struts, and brakes, that supports the aircraft on the ground. It may be fixed or retractable.
Lateral Axis
An imaginary line running from wingtip to wingtip through the center of gravity. Pitch movement (nose up/down) occurs around the lateral axis and is controlled by the elevator.
Lean
The process of reducing the fuel-air mixture to improve engine efficiency at cruise altitudes. Leaning is typically performed above 3,000 feet density altitude for normally aspirated engines.
Load Factor
The ratio of the total load supported by the wings to the actual weight of the aircraft, expressed in Gs. In a 60-degree banked turn, the load factor is 2G.
Localizer
The lateral guidance component of an ILS that provides left-right course information to help the pilot align with the runway centerline during an approach.
Logbook
A pilot's record of flight time, training received, and endorsements. It serves as evidence of experience and eligibility for certificates, ratings, and currency requirements.
Longitudinal Axis
An imaginary line running from the nose to the tail of the aircraft. Roll movement (banking) occurs around the longitudinal axis and is controlled by the ailerons.
Lift
The aerodynamic force generated by a wing that acts perpendicular to the relative wind and supports the aircraft in flight. Lift is affected by airspeed, angle of attack, wing area, and air density.
M
8 terms
Maneuvering Speed (Va)
The maximum speed at which full abrupt control deflections can be applied without exceeding the aircraft's structural limits. It decreases as aircraft weight decreases.
Magnetic Variation
The angular difference between true north and magnetic north at a given location. It is shown on sectional charts as isogonic lines and must be applied during navigation planning.
METAR
Meteorological Aerodrome Report. A standardized weather observation format reporting current surface conditions including wind, visibility, weather, clouds, temperature, dew point, and altimeter setting.
Minimum Safe Altitude
The lowest altitude that provides at least 1,000 feet of obstacle clearance within a specified area. Used for emergency situations and charted on instrument approach procedures.
MOA
Military Operations Area. Airspace designated for military training activities such as aerobatics and gunnery. VFR aircraft may transit a MOA but should exercise caution.
MSL
Mean Sea Level. An altitude reference measured from the average level of the ocean surface. Most aviation altitudes, charts, and terrain elevations are referenced to MSL.
Mixture
The ratio of fuel to air entering the engine. The mixture control in the cockpit allows the pilot to lean (reduce fuel) or enrich (add fuel) the mixture for efficient operation at various altitudes.
Magnetic Compass
The primary direction-finding instrument in the aircraft. It uses a magnetic element to indicate the aircraft's heading relative to magnetic north and is subject to deviation and dip errors.
N
6 terms
NDB
Non-Directional Beacon. A ground-based radio transmitter that sends signals in all directions, used with the aircraft's ADF for navigation. Being phased out in favor of GPS.
Never Exceed Speed (Vne)
The maximum speed at which the aircraft may be operated under any circumstances. Exceeding Vne risks structural failure. It is marked as the red line on the airspeed indicator.
Night Currency
Per 14 CFR 61.57, a pilot must have made at least three takeoffs and landings to a full stop during the preceding 90 days between one hour after sunset and one hour before sunrise to carry passengers at night.
NORDO
No Radio. A term describing an aircraft operating without a functioning radio. NORDO aircraft follow specific procedures and light gun signals when operating at towered airports.
NOTAM
Notice to Air Missions (formerly Notice to Airmen). A notice containing time-critical information about changes to aeronautical facilities, services, procedures, or hazards.
Nautical Mile
A unit of distance equal to one minute of latitude, approximately 6,076 feet or 1.15 statute miles. It is the standard unit of distance in aviation navigation.
O
5 terms
OBS
Omni Bearing Selector. The knob on a VOR indicator that allows the pilot to select a desired radial or course. Rotating the OBS changes the CDI reference.
Obstacle Clearance
The minimum vertical separation between an aircraft and the highest obstacle within a defined area. Required by regulations for instrument approaches, en route flight, and traffic pattern operations.
Oil Pressure
An engine instrument that displays the pressure of the oil circulating through the engine. It is one of the most critical engine gauges; low oil pressure indicates a potential engine failure.
Operating Limitations
The approved conditions and limits under which an aircraft may be safely operated, found in the POH. Includes weight limits, speed limits, approved maneuvers, and system restrictions.
Overfly
To fly directly over a specific point, such as a waypoint, airport, or landmark. Overflying can also refer to transiting airspace without landing.
P
11 terms
P-Factor
Asymmetric propeller loading. At high angles of attack, the descending (right) propeller blade produces more thrust than the ascending blade, causing the aircraft to yaw left.
Pilot in Command
The pilot responsible for the operation and safety of the aircraft during flight. The PIC has final authority over the aircraft and must be qualified for the flight.
Pilotage
A navigation method in which the pilot determines position by visually referencing landmarks on the ground and matching them to features on a sectional chart.
Pitot Tube
A pressure-sensing probe mounted on the aircraft that measures ram air pressure for the airspeed indicator. Blockage by ice or insects causes erroneous airspeed readings.
POH
Pilot's Operating Handbook. The FAA-approved manual for a specific aircraft that contains performance data, operating procedures, limitations, emergency procedures, and weight and balance information.
Precession
A characteristic of gyroscopic instruments in which an applied force causes the gyro to react 90 degrees in the direction of rotation. It causes heading indicator drift over time.
Preflight
The systematic inspection of an aircraft before flight to verify it is airworthy. The pilot checks the exterior, interior, engine, fuel, oil, controls, and instruments.
Pressure Altitude
The altitude displayed on the altimeter when set to the standard datum of 29.92 inHg. It is used for performance calculations and is the basis for flight levels above 18,000 feet.
Private Pilot
A certificate that allows the holder to fly as pilot in command of an aircraft for personal or recreational purposes, carry passengers, and share expenses. Cannot fly for hire.
Prop
Short for propeller. The rotating blade assembly that converts engine power into thrust by accelerating air rearward. Propellers may be fixed-pitch or constant-speed.
Pattern
The standard rectangular flight path around an airport used for takeoffs and landings, consisting of upwind, crosswind, downwind, base, and final legs. Standard patterns use left turns.
Q
1 term
QNH
The altimeter setting that causes the altimeter to read the airfield elevation when the aircraft is on the ground. Essentially the same as the local altimeter setting used in the U.S.
R
8 terms
Radar
Radio Detection and Ranging. An electronic system that uses radio waves to detect and determine the range, bearing, and speed of aircraft and weather. Used by ATC for separation and surveillance.
Range
The maximum distance an aircraft can fly on a given fuel load without refueling. Range is maximized at the airspeed that produces the best lift-to-drag ratio.
Relative Wind
The direction of airflow relative to the wing, equal and opposite to the aircraft's flight path. It determines the angle of attack regardless of aircraft attitude.
Restricted Area
Airspace designated under FAR 73 where flight is restricted due to hazardous activities such as artillery firing, aerial gunnery, or guided missile testing. Entry requires permission from the controlling agency.
RNAV
Area Navigation. A method of navigation that permits aircraft operation on any desired flight path within the coverage of navigation aids or within the limits of self-contained systems like GPS.
Rudder
The movable control surface on the vertical stabilizer that controls yaw (left-right movement of the nose). It is operated by the pilot's feet on the rudder pedals.
Runway
A defined rectangular area on the ground prepared for aircraft takeoff and landing. Runway numbers correspond to the magnetic heading (rounded to the nearest 10 degrees) divided by 10.
Ramp
The paved area at an airport where aircraft are parked, loaded, fueled, and maintained. Also called the apron or tarmac.
S
10 terms
Sectional Chart
A VFR aeronautical chart at a scale of 1:500,000 showing terrain, airspace, airports, navigation aids, and other features. It is the primary chart for VFR navigation.
SIGMET
Significant Meteorological Information. An advisory for severe weather conditions (severe icing, severe turbulence, volcanic ash, dust storms) that affect all aircraft, not just small ones.
Sink Rate
The rate at which an aircraft descends, measured in feet per minute. Maintaining an appropriate sink rate on final approach is critical for safe landings.
Slip
A maneuver in which the pilot uses crossed controls (aileron one way, rudder the other) to increase drag and lose altitude without gaining airspeed. Used on approach when too high.
Solo
A flight in which a student pilot is the sole occupant of the aircraft. Solo flight requires a CFI endorsement and is a major milestone in flight training.
Squawk
A four-digit code assigned by ATC and set on the aircraft's transponder for radar identification. Common codes include 1200 (VFR), 7500 (hijack), 7600 (comm failure), and 7700 (emergency).
Stall
An aerodynamic condition in which the wing exceeds its critical angle of attack and can no longer produce sufficient lift to sustain flight. A stall can occur at any airspeed or attitude.
Standard Rate Turn
A turn at a rate of 3 degrees per second, completing a 360-degree turn in two minutes. It is the standard rate used in instrument flying and holding patterns.
Steep Turn
A coordinated turn using a bank angle of 45 degrees or more. Steep turns are required maneuvers for the private pilot checkride and significantly increase load factor.
Skid
A flight condition in which the aircraft's rate of turn is too great for the angle of bank, causing the ball to move to the outside of the turn. Corrected by adding bank or reducing rudder.
T
15 terms
TAWS
Terrain Awareness and Warning System. An electronic system that provides visual and audible alerts when the aircraft is in dangerous proximity to terrain, helping prevent CFIT accidents.
TAS
True Airspeed. The actual speed of the aircraft through the air mass, corrected for altitude and temperature from indicated airspeed. Used for flight planning and navigation.
TAF
Terminal Aerodrome Forecast. A weather forecast for a specific airport covering a 24- or 30-hour period, describing expected wind, visibility, weather, and cloud conditions.
Taxiway
A defined path at an airport for aircraft to move between runways, ramps, and hangars. Taxiway markings are yellow, and signs use yellow text on a black background.
Threshold
The beginning of the usable portion of the runway for landing. It is marked by green lights at night and white threshold markings on the pavement.
Throttle
The control that regulates engine power by adjusting the amount of fuel-air mixture entering the engine. Pushing it forward increases power; pulling it back reduces power.
Torque
The tendency of the aircraft to rotate opposite to the direction of propeller rotation (Newton's third law). In most single-engine aircraft, torque causes a left-turning tendency.
Touch and Go
A training maneuver in which the pilot lands the aircraft and immediately applies full power to take off again without coming to a full stop. Used to practice takeoffs and landings.
Transponder
An electronic device aboard the aircraft that responds to radar interrogation signals from ATC, providing identification and altitude information on the controller's radar display.
Trim
An adjustable control surface or system that relieves the pilot of sustained control pressure. The trim tab is adjusted so the aircraft maintains the desired attitude hands-off.
True Altitude
The actual vertical distance of the aircraft above mean sea level. It equals indicated altitude when the altimeter is correctly set and conditions match standard atmosphere.
Turbulence
Irregular motion of the atmosphere that causes an aircraft to experience sudden changes in altitude and attitude. Categories range from light to extreme based on intensity.
TWEB
Transcribed Weather Broadcast. A continuously recorded weather summary and forecast transmitted over selected NDB and VOR stations for pilot information during flight.
Tailwind
A wind blowing in the same direction as the aircraft's path of flight. Tailwinds increase groundspeed but lengthen takeoff and landing distances.
Thrust
The forward force produced by the engine and propeller (or jet engine) that moves the aircraft through the air. Thrust must overcome drag for the aircraft to accelerate.
U
3 terms
Unicom
A non-government air-ground radio communication station providing airport advisory information such as wind, favored runway, and traffic at non-towered airports. Common frequency is 122.8 MHz.
Uncontrolled Airspace
Class G airspace in which ATC has no authority over or responsibility for separating air traffic. Pilots are responsible for their own traffic avoidance and weather compliance.
Useful Load
The difference between the aircraft's maximum gross weight and its empty weight. It includes the weight of fuel, oil, passengers, baggage, and other payload.
V
14 terms
Va (Maneuvering Speed)
The maximum speed at which the aircraft can withstand full abrupt control inputs without structural damage. Va changes with weight; refer to the POH for specific values.
Vfe (Maximum Flap Extended Speed)
The highest speed at which the aircraft may be flown with flaps extended. Marked as the top of the white arc on the airspeed indicator.
Vne (Never Exceed Speed)
The absolute maximum speed for the aircraft under any conditions. Exceeding Vne may cause structural failure. Marked as the red line on the airspeed indicator.
Vno (Maximum Structural Cruising Speed)
The maximum speed for normal operations. Above Vno, the aircraft should only be operated in smooth air. It is the top of the green arc on the airspeed indicator.
Vr (Rotation Speed)
The speed at which the pilot begins to apply back pressure on the yoke or stick to lift the nose wheel off the runway during takeoff.
Vs (Stall Speed, Clean)
The stalling speed or minimum steady flight speed at which the aircraft is controllable in a specific configuration, typically with flaps and gear retracted.
Vs0 (Stall Speed, Landing Configuration)
The stalling speed in the landing configuration (flaps and gear extended). It marks the bottom of the white arc on the airspeed indicator.
Vx (Best Angle of Climb Speed)
The speed that produces the greatest altitude gain per unit of horizontal distance. Used when maximum altitude is needed over a short distance, such as clearing obstacles after takeoff.
Vy (Best Rate of Climb Speed)
The speed that produces the greatest altitude gain per unit of time. Used for normal climb operations to reach cruise altitude as quickly as possible.
VFR
Visual Flight Rules. A set of regulations under which a pilot operates by maintaining visual reference to the ground and other aircraft. Requires specific weather minimums for visibility and cloud clearance.
Visibility
The greatest distance at which prominent objects can be seen and identified, reported in statute miles in METARs. VFR flights require specific minimum visibility values depending on airspace class.
VOR
VHF Omnidirectional Range. A ground-based radio navigation aid that transmits 360 radials (courses) for aircraft to track to or from the station. The backbone of the airway system.
VORTAC
A navigational aid that combines VOR azimuth information with TACAN (Tactical Air Navigation) distance measuring equipment, providing both bearing and distance information to pilots.
VSI
Vertical Speed Indicator. A flight instrument that shows the rate of climb or descent in feet per minute by measuring the rate of change in static pressure.
W
8 terms
Wake Turbulence
Turbulent air generated by the wingtip vortices of a heavier aircraft. It is most hazardous behind large, heavy, slow, clean-configuration aircraft and can cause loss of control.
Waypoint
A predetermined geographical position used for route navigation, defined by latitude/longitude coordinates or by a five-letter identifier. GPS navigation relies heavily on waypoints.
Weather Briefing
A comprehensive review of current and forecast weather conditions obtained from FSS, DUATS, or online sources before a flight. Three types exist: standard, abbreviated, and outlook.
Weight and Balance
A calculation performed before each flight to ensure the aircraft's weight does not exceed limits and the center of gravity falls within the approved envelope for safe flight.
Wind Correction Angle
The angular adjustment a pilot makes to the aircraft's heading to compensate for wind drift and maintain the desired ground track. Also called wind correction or crab angle.
Wind Shear
A sudden, drastic change in wind speed or direction over a short distance. It is especially dangerous during takeoff and landing and can be associated with thunderstorms and fronts.
Windsock
A cone-shaped device at an airport that indicates the direction and relative speed of the wind. The sock points away from the wind and extends fully in winds of about 15 knots.
Weight
The force of gravity acting on the aircraft. One of the four forces of flight, weight acts downward and must be overcome by lift for the aircraft to fly.
X
1 term
X-Wind (Crosswind Component)
The component of wind blowing perpendicular to the runway or flight path. Pilots calculate the crosswind component using the wind angle and speed to determine if conditions are within limits.
Y
2 terms
Yaw
The rotation of the aircraft around its vertical axis, causing the nose to move left or right. Yaw is controlled by the rudder and caused by adverse yaw, P-factor, and torque.
Yoke
The control column in the cockpit used to operate the ailerons (roll) and elevator (pitch). Pulling back raises the nose; pushing forward lowers it. Turning it banks the aircraft.
Z
2 terms
Zulu Time
Aviation's standard time reference, also known as Coordinated Universal Time (UTC) or Greenwich Mean Time (GMT). All flight plans, METARs, TAFs, and NOTAMs use Zulu time.
Zero Fuel Weight
The maximum allowable weight of the aircraft and its contents without usable fuel. It limits structural stress on the wing roots during flight. Fuel must be the last weight added beyond this limit.

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