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Glossary
   
Term Definition
AGL Above Ground Level
AIM Aeronautical Information Manual
Air Care Alliance A national league of organizations whose pilots and other volunteers fly patients and perform other public benefit missions. Members include most such groups. See http://www.aircareall.org for details and contact information.
Air Carrier Person who undertakes directly by lease, or other arrangement, to engage in air transportation.
air miss breach of the specified minima of proximity between two aircraft.
Air Traffic aircraft operating in the air or on airport surface, exclusive of loading ramps and parking areas
Air traffic clearance An authorization by air traffic control, for the purpose of preventing collision between known aircraft, for an aircraft to proceed under specified traffic conditions iwthin controlled airspace.
Airfoil Any surface designed to obtain a useful reaction, or lift, from air passing over it. Airplane wings, propeller blades, and helicopter rotors are examples of airfoils.
Airframe The fuselage, booms, nacelles, cowlings, fairing, airfoil surfaces (indluding rotors but excluding propellers and rotating airfoils of engines), and landing gear of an aircraft and their accessories and controls.
Airship Engine-driven lighter-than-air aircraft that can be steered.
Alert Area Established to inform pilots of a specific area wherein a high volume of pilot training or an unusual type of aeronautical activity is conducted.
ALS Approach Light System
AOG Aicraft on Ground
Area navigation
low route
An area navigation route within the airspace extending upward from 1.200 feet above the surface of the earth to, but not including, 18,000 feet MSL.
ASR Airport Surveillance Radar
ATC Air Traffic Control - service operated by appropriate authority to promote the safe, orderly, and expeditious flow of air traffic.
Autorotation Rotorcraft flight condition in which the lifting rotor is driven entirely by action of the air when the rotorcraft is in motion. This is usually an engine-out situation in a helicopter.
Balloon Lighter-than-air aircraft that is not engine driven, and that sustains flight through the use of either gas buoyancy or an airborne heater.
Bush Pilot One who operates an STOL type aircraft successfully on a daily basis in off airport operations.
Canard An aircraft configuration in which the span of the forward wing is substantially less than that of the main wing. Examples are the Long-EZ kit plane and the Wright Flyer.
CAS Calibrated Airspeed - the indicated airspeed of an aircraft, corrected for position and instrument error. CAS is equal to true airspeed in standard atmosphere at sea level.
CAT II Category II
CAVU Ceiling and visibility unlimitedJeff Ott
Ceiling Height above the earth's surface of the lowest layer of clouds or obscuring phenomena that is reported as "broken", "overcast", or "obscuration", and not classified as "thin" or "partial".
Commercial Operator Person who, for compensation or hire, engages in the carriage by aircraft in air commerce of persons or property.
CONSOL kind of low or medium frequency long range navigational aid
Critical Altitude The maximum altitude at which, in standard atmosphere, it is possible to maintain, at a specified rotational speed, a specified power or a specified manifold pressure. Critical Altitude is the maximum altitude at which it is possible to maintain the maximum continuous horsepower, or the maximum continuous rated manifold pressure.
Critical Engine The engine whose failure would most adversely affect the performance or handling qualities of an aircraft.
Decision Height The height at which a decision must be made, during an ILS or PAR instrument approach, to either continue the approach or to execute a missed approach.
DH Decision Height
DME Distance Measuring Equipment compatible with TACAN
EAS equivalent airspeed
Equivalent airspeed The calibrated airspeed of an aircraft corrected for adiabatic compressible flow for the particular altitude. Equivalent airspeed is equal to calibrated airspeed in standard atmosphere at sea level.
Extended
over-water operation
Operation of an aircraft over water at a horizontal distance of more than 50 nautical miles from the nearest shoreline.
FAA Federal Aviation Administration
FAR Federal Aviation Regulations
Flight Level A level of constant atmospheric pressure related to a reference datum of 29.92 inches of mercury. i.e. Flight Level 250 represents a barometric altimeter indication of 25,000 feet.
FM Fan Marker
Glider A heavier-than-air aircraft that is supported in flight by the dynamic reaction of the air against its lifting surfaces and whose free flight does not depend principally on an engine. An example is the Nimbus III
GS Glide Slope
Gyrodyne A rotorcraft whose rotors are normally engine-driven for takeoff, hovering, and landing, and for forward flight through part of its speed range, and whose means of propulsion, consisting usually of conventional propellers, is independent of the rotor system.
Gyroplane Rotorcraft whose rotors are not engine-driven, except for initial starting, but are made to rotate by action of the air when the rotorcraft is moving; and whose means of propulsion, consisting usually of conventional propellers, is independent of the rotor system.
HIRL High-Intensity Runway Light system
IAS Indicated Airspeed
ICACO International Civil Aviation Organization
IFR Instrument Flight Rules
IFR conditions Weather conditions below the miminum for visual flight rules.
IFR over-the-top On an IFR flight plan, air traffic control may clear pilot to maintain VFR conditions.
ILS Instrument Landing System
IM ILS Inner Marker
Indicated airspeed The speed of an aircraft as shown on its pitot static airspeed indicator calibrated to reflect standard atmosphere adiabatic compressible flow at sea level uncorrected for airspeed system errors.
INT Intersection
Large aircraft Aircraft with maximum certificated takeoff weight greater than 12,500 pounds.
LASO Land and hold short
LDA Localizer-Type Directional Aid
LFR Low-Frequency Radio range
LMM compass Locator at middle marker
LOC ILS localizer
LOM compass Locator at Outer Marker
M Mach number. Ratio of true airspeed to the speed of sound.
MAA Maximum Authorized IFR Altitude
MALS Medium intensity Approach Light System
MALSR Medium intensity Approach Light System with Runway alignment indicator lights
MCA Minimum Crossing Altitude
MDA Minimum Descent Altitude
MEA Minimum En route IFR Altitude
MM ILS middle marker
MOA Military Operations Area.
Airspace established outside Class A airspace to separate or segregate certain non-hazerdous military activities from IFR Traffic and to identify for VFR traffic where these activities are conducted. i.e. It looks like this on a sectional.
MOCA Minimum Obstruction Clearance Altitude
MRA Minimum Reception Altitude
MSL Mean Sea Level
NDB (ADF) Non-Directional Beacon (Automatic Direction Finder)
NMAC Near Mid-Air Collision
NOPT No Procedure Turn required
NOTAM Notice To AirMenGabriele
OEI one engine inoperative
OM ILS Outer Marker
PAR Precision Approach Radar
PPH Pounds per hour
QNH Altimeter setting (outside USA), relative to Man Sea level
RAIL Runway Alignment Indicator Light system
RBN Radio Beacon
RCLM Runway Centerline Marking
RCLS Runway Centerline Light System
REIL Runway End Identification Lights
RNAV Area Navigation - 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.
RR low or medium frequency Radio Range station
RVR Runway Visual Range as measured in the touchdown zone area
SALS Short Approach Light System
Scud-Running flying low along the ground to avoid low clouds while still maintaining visibility
SMOH Since Major OverHaul - often seen in classified ads - the flight time in hours since the engine was overhauled. Related terms, see TBOH
SSALS Simplified Short Approach Light System
SSALSR Simplified Short Approach Light System with Runway alignment indicator lights
STOL Short Take Off and Landing.Jag Dawadi
TACAN ultra-high frequency Tactical Air Navigational Aid
TAS True Airspeed
TBOH Time Before OverHaul - often seen in classified ads - the flight time in hours until the engine is scheduled to be overhauled in accordance with manufacturer specs. Related terms, see SMOH
TCAS Traffic Alert and Collision Avoidance system
TDZL Touchdown Zone Lights
Tilt Rotor An aircraft whose rotors can be directed to provide vertical take-off and landing, and also tilted forward to provide forward thrust for cruise flight. An example of a Tilt Rotor is the Bell/Boeing V-22 Osprey.
TVOR Very high frequency Terminal Omnirange station
V1 the maximum speed in the takeoff at which the pilot must take the first action (e.g. apply brakes, reduce thrust, deploy speed brakes) to stop the aircraft within the accelerate-stop distance. V1 also means the minimum speed in the takeoff, following a failure of the critical engine at VEF, at which the pilot can continue the takeoff and achieve the required height above the takeoff surface within the takeoff distance.
V2 takeoff safety speed
V2min minimum takeoff safety speed
VA design maneuvering speed
VB design speed for maximum gust intensity
VC design crusing speed
VD design diving speed
VDF/MDF demonstrated flight diving speed
VEF speed at which the critical engine is assumed to fail during takeoff
VF design flap speed
VFCMFC Maximum speed for stability characteristics. A speed that may not be less than a speed midway between maximum operating limit speed (VMO/MMO) and demonstrated flight diving speed.
VFE maximum flap extended speed
VH maximum speed in level flight with maximum continuous power
VLE maximum landing gear extended speed
VLO maximum landing gear operating speed
VLOF lift-off speed
VMC minimum control speed with the critical engine inoperative
VMOMMO maximum operating limit speed
VMU minimum unstick speed
VNE never-exceed speed
VNO maximum structural crusing speed
VR rotation speed
VS stalling speed or the minimum steady flight speed at which the airplane is controllable
VS1 stalling speed or the minimum steady flight speed obtained in a specific configuration
VSO stalling speed or the minimum steady flight speed in the landing configuration
VTOSS takeoff safety speed for Category A rotorcraft
VX speed for best angle of climb - the speed at which an aircraft will gain the most altitude in the shortest distance
VY speed for the best rate of climb - the speed at which an aircraft will gain the most altitude in the least amount of time
VAR Visual Aural RangeJim Rutherford
VFR visual flight rules
VHF very high frequency
VOR very high frequency omnirange station
VORTAC collocated VOR and TACAN
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Copyright © 1995-2005 James E. McHenry. All rights reserved.
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