Word Menu is the ultimate language reference for inexperienced and proficient writers alike — students, learners of English, creative writers, journalists, business executives and office professionals.
altitude - height above Earth’s surface or sea level
angle of attack - angle between airfoil and relative flow of wind
angle of incidence - angle between chord line of airfoil and thrust of aircraft
approach - final period of descent prior to landing
asymmetric landing - emergency landing in which engine on one side has failed
attitude - position of aircraft expressed as inclination of its three axes (pitch, roll, and yaw) to frame of reference
augmentation - increase of thrust by various methods
autorotation - condition of flight achieved when lift is derived solely by effect of aerodynamic forces on unpowered rotor of autogyro or helicopter, or when power is lost
aviation - art and science of flying aircraft; development of heavier-than-air aircraft
ceiling - height above Earth’s surface of lowest significant cloud layer; altitude at which rate of climb of given aircraft falls to 100 feet (30 m) per minute
center of gravity - point in body toward which every external particle of matter is attracted by gravity
chandelle - abrupt, steep climb caused by aircraft’s momentum
chord line - imaginary line from leading to trailing edge of airfoil
circling - flight pattern adopted by pilot while awaiting landing clearance or to position aircraft for landing
clear air turbulence - CAT; unpredictable high-altitude turbulence with no clouds present, esp. wind shear due to jetstream
induced drag - portion of wing drag resulting from generation of lift
in-flight - (adj) done or occurring while aircraft is airborne
instrument flight rules - IFR; type of flight plan and rules governing procedures for instrument flight
instrument landing - avionic approach and landing in which ILS, PAR, or VOR is used
instrument landing system - ILS; precision instrument approach based on beams transmitted from glide slope on ground that give vertical and lateral guidance by localizer up to decision height for visual landing
jet propulsion - momentum derived from ejection of exhaust stream or rapid flow of gas from within propelled body by mechanical, thermal, or chemical process: turbojet, fanjet, ramjet, pulsejet, rocket
limit load factor - maximum pull of gravity to which airframe may be subjected in flight without structural damage
load - in-flight weight carried by aircraft, including cargo, fuel, passengers, crew, and weight of aircraft when empty
load factor - pull of gravity in absence of acceleration (load factor of 4 equals 4G); amount of load an aircraft can carry
longitudinal axis - axis from nose to tail of aircraft, parallel to direction of flight; roll axis
loop - circular figure performed as flight maneuver, beginning with aerobatic pull-up through vertical plane and ending with return to horizontal flight in same direction
mach number - ratio of airspeed of an object to the speed of sound at given altitude and atmosphere, being 762 mph at sea level
manifold pressure - factor used to determine grade of fuel required by aircraft engine
mass ratio - ratio between mass of aircraft with fuel and after fuel has been used up
Mayday - international radiotelephone distress signal, repeated three times to indicate imminent, grave danger
missed approach - approach aborted by pilot at decision height when instrument approach cannot be completed safely
moment - measure of aircraft’s tendency to produce motion about an axis
nose dive - swift, steep downward plunge of aircraft with nose toward ground
octant - 45-degree angle, being one-eighth of a circle, used to state heading
over-the-top - (adj) indicating position of aircraft above cloud layer or other obscuring phenomena forming ceiling
Pan - international radiotelephone distress signal
parachute - umbrellalike cloth contrivance used to retard falling speed of person or object dropped from aircraft
payload - commercial revenue-producing load; expendable or deliverable load, such as bombs, used in military operations
pitch - distance advanced by propeller in one revolution; movement of aircraft about lateral axis
polar - (adj) having directional setting at north magnetic pole
power loading - ratio of gross weight of airplane to its power
precision approach - standard instrument approach in which electronic glide slope is provided by precision approach radar or instrument landing system
pressure altitude - altitude relative to given pressure in standard atmosphere, uncorrected for temperature
pressurization - regulation of cabin pressure for comfort of crew and passengers at high altitudes with low atmospheric pressure
probe and drogue - method of in-air refueling in which tanker plane extends hose and funnel, or drogue, to which trailing plane extends intake pipe, or probe
propulsion - driving force in engine that moves aircraft
touchdown - point at which aircraft makes contact with landing surface
transonic - (adj) just below or just above speed of sound
true airspeed - indicated airspeed on cockpit gauge corrected for installation error, compressibility of air, pressure, and temperature; equivalent airspeed corrected for pressure and temperature
turbulence - irregular motion of air that disrupts smooth flight
visibility - distance at which unlighted objects can be seen under existing atmospheric conditions on ground or in flight
visual flight rules - VFR; flight plan or maneuvering and rules governing conduct of flight based on pilot’s visual observations in acceptable weather conditions
wake turbulence - turbulence caused by passage of aircraft through atmosphere
washin - increase in angle of incidence from root to tip of wing
washout - decrease in angle of incidence from root to tip of wing
wind shear - change of wind speed or direction over short distance, esp. due to thunderstorm
wing flex - design of wings to flex and not remain rigid, providing smoother flight by allowing apparent flapping
wing loading - gross weight of aircraft expressed as weight per unit area of wing surface
wingover - flight maneuver beginning with climbing turn to point of stall, after which nose falls as turn continues so that aircraft emerges flying in opposite direction
yaw - rotation of aircraft about vertical axis; deviation from line of flight, controlled by rudder