CANOPYA covering; for example, a cockpit
canopy is a transparent covering for a cockpit.
CELSIUSThe temperature scale using the freezing
point as zero and the boiling point as 100, with 100
equal divisions between, called degrees. A reading
is usually written in the abbreviated form, for
example, 75 C. This scale was formerly known as
the Centigrade scale, but was renamed Celsius in
recognition of Andrew Celsius, the Swedish
astronomer who devised the scale.
COCKPITA compartment in the top of an aircraft
fuselage for the pilot and other crew members.
COWLINGA removable cover or housing placed
over or around an aircraft component or section,
especially an engine.
DE-ICINGThe breaking off or melting of ice from
aircraft surfaces, or fuel induction systems.
DENSITYThe weight per unit volume of a
DESCENTRelative to an aircraft, to come down,
under control, from a higher to a lower altitude.
DYE MARKERA substance that, when placed in
immediately to make a spot readily visible from the
ELEVATORAs applied to aircraft, a control surface,
usually hinged to a horizontal stabilizer, that is used
to control the aircraft about its lateral axis. As
applied to aircraft carriers, elevators are used to
move aircraft between the flight deck and hanger
EMPENNAGEThe tail section of an aircraft,
including the stabilizing and control surfaces.
ENERGYThe ability or capacity to do work.
ETAEstimated time of arrival.
FACE CURTAINA sheet of heavy fabric, installed
above an ejection seat, that is pulled down to trigger
the ejection seat and to protect the pilot or crew
member's face against wind blast.
FAIRINGA part or structure that has a smooth,
streamlined outline, used to cover a nonstreamlined
FLAPThe tendency of a blade to rise with high-lift
demands as it tries to screw itself upward into the
FLASH POINTThe temperature at which a
substance, such as oil or fuel, will give off a vapor
that will flash or burn momentarily when ignited.
FLIGHT CONTROL MECHANISMThe linkage
that connects the control(s) in the cockpit with the
flight control surface(s).
FORCEThe action of one body on another tending
to change the state of motion of a body acted upon.
Force is usually expressed in pounds.
FUSELAGEThe main or central structure of an
aircraft that carries the crew, passengers, or other
HORSEPOWERA unit of power equal to the power
necessary to raise 33,000 pounds one foot in 1
HUMIDITYMoisture or water vapor in the air.
HYDRAULICSThe branch of mechanics that deals
with the action or use of liquids forced through
tubes and orifices under pressure to operate various
INERTIAThe tendency of a body at rest to remain at
rest, and a body in motion to continue to move at a
constant speed along a straight line, unless the body
is acted upon in either case by an unbalanced force.
JETTISONTo throw or dump overboard.
example, to drop or eject fuel, tanks, or gear from
an aircraft to lighten the load for emergency action.
LAGThe tendency of rotor blades to remain at rest
LANDING GEARThe components of an aircraft
that support and provide mobility foe the aircraft on
land, water, or other surfaces.
LAUNCHTo release or send forth. For example, to
launch aircraft from an aircraft carrier.
LEADThe tendency of rotor blades to remain in
motion during deceleration.
LEADING EDGEThe forward edge of an airfoil
that normally meets the air first.
LONGERONA main structural member along the
length of an airplane body, to fuselage.
LONGITUDINALThe lengthwise dimension; for
example, the longitudinal axis of an aircraft runs
lengthwise from the nose to the tail.
MIMMaintenance Instruction Manual.