the Aviation Dictionary

fuel-air combustion starter - A fuel engine-starting
accessory that utilizes a combustion section similar to a
turbine engine. Combustion products are exhausted
through a turbine connected to a reduction gearbox to
create starting torque.
fuel-oil heat exchanger - A heat exchanging device
used on turbine engines to take heat from the engine oil
and put it into the fuel. It is a radiator-like unit
directing fuel through the tubes that pass through the
hot engine oil. Heat fiom the oil raises the fuel
temperature, and at the same time, lowers the
temperature of the oil.
fulcrum - A point on which a lever is supported,
balanced, or about which it turns.
fuel-air combustion starter fusible alloy
fully articulated rotor - A rotor that is attached to a
helicopter rotor hub in such a way that the pitch angle
of each blade can change, and each blade is free to
move up and down and back and forth in its plane of
rotation.
fuel-air mixture ratio - The weight ratio in pounds of fumes -Vaporized liquids.
the fuel and air that are mixed together creating a
functional check - A check for proper operation of the
combustible mixture to be burned in an engine.
aircraft and systems. Required before returning - an
fuel-oil cooler - A heat exchange device that heats the aircraft to service after an annual or 100-hour
fuel and cools the oil. It is a radiator-like unit. Fuel inspection.
passes through the cores and oil passes around the
functional test - A method of testing a system through
cores. The oil flow is controlled by a thermostatic
its normal operating range to determine whether or not
valve that routes the oil through the cooler only when a
certain oil temperature is reached. On some engines. no
it functions properly.
- .
fuel heater is required due to the exchange rate of this fundamentals of instruction - Includes the learning
oil cooler.
process, elements of effective teaching, - student
evaluation and testing, course development, lesson
planning, and classroom training techniques.
fungicidal paste - A paste mixed with clear dope and
applied as a first coat on cotton. The fungicidal agent
soaks into the fibers and prevents the formation of
mold or fungus.
fungus spores - The seed of certain fungi that attach to
organic materials such as cotton or linen and cause the
material to rot.
full annealing - A process used to produce a fine funnel cloud - A tornado cloud extending downward
grained, soft, ductile metal without internal stresses or from the varent cloud but not reaching - the - ground.
&aim. To filly anneal a metal, the temperature of the
metal is raised to its critical temperature followed by
funneling effect - An increase in winds due to airflow
controlled cooling.
through a narrow mountain pass.
full fuel - The amount of fuel in an aircraft when all fuel -A deep
tanks are filled to the quantity called for in the aircraft fuse - An aircraft electrical circuit protection device. It
specifications.
consists of a link of low-melting-point metal that melts
full oil - The quantity of oil shown as oil capacity in
and opens the circuit when an excessive amount of
aircraft specifications.
current flows through it.
full rudder - The movement of the rudder to its extreme
fuse holder - A device mounted to an electrical fuse
panel that holds tubular fuses and makes connections to
limit.
both ends.
full throw - The full range of control surface travel.
fuse link - A strip of low-melting-point metal used in an
full-register position - The position of the rotating electrical circuit fuse device to protect a circuit. When
magnet in a magneto when the poles are fully aligned excessive current flows through the circuit the fuse link
with the pole shoes of the magneto frame. At this point, melts and opens the circuit.
the maximum number of lines of flux flow in the
frame.
fuselage - The area of an airplane aft of the firewall and
forward of the empennage. The cabin or cockpit, is
full-rich - That position of the mixture control that located in the fuselage. 1t may also provide room for
allows the maximum amount of fuel to flow to the cargo and attachment points for other major airplane
engine relative to air flow.
components.
full-scale drawing - A drawing of a part that is the fuselage stations - Distances measured along the lonsame
size as the part.
gitudinal axis of an airplane. Represents distances from
the datum in inches.
full-wave rectifier - A form of rectifier that inverts one
half of the input AC signal and provides a pulsating fusible alloy - A filler material that melts at
DC output having twice the frequency of the input approximately 160°F. Used to prevent kinking during
alternating current.
Aircraft Technical Bookt&%&qding. The alloy is heated in hot water and
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