the Aviation Dictionary

reconformance . regional checkout
full state of charge. Reconditioning equalizes the cells cross-point screwdriver whose tip has a single taper.
for optimum performance.
reed valve - A thin, leaf-type valve located in the valve
reconformance - The automated process of bringing an plate of a reciprocating-type air conditioning
aircraft's Current Plan Trajectory into conformance compressor to control the inlet and outlet of the
with its track.
refrigerant.
rectangle - A closed plane figure with four sides and reface - To resurface an object in order to remove
four right angles. The opposite sides of the figure are imperfections or wear marks.
parallel and equal in length.
reference datum - An imaginary vertical plane at or
rectifier -A device that converts alternating current into near the nose of an aircraft from which all horizontal
direct current. In effect, it is an electron check valve. distances are measured for weight and balance
rectifier bridge - A rectifier using four diodes arranged
calculations.
in a bridge circuit.
reference datum - An imaginary vertical plane from
which all horizontal distances are measured for balance
rectify - In electricity, to change alternating current into
purposes.
direct current.
reference designator - A combination of letters and
recurring - Happening again and again at regular or
numbers used to identify a component or assembly.
frequent intervals.
recurring Airworthiness Directive - An Airworthiness
Directive that requires compliance at regular hourly or
calendar time periods.
red brass - A copper-zinc alloy containing
approximately 85% copper and 15% zinc. It is
somewhat stronger than commercial bronze and is
hardened by cold working.
red line - A red mark on an aircraft instrument that
indicates a maximum allowable operating condition.
red rust - A nonmagnetic iron oxide.
red-line condition - The maximum safe condition at
which a unit can operate. Most aircraft instruments are
marked with a red line indicating the boundaries of
their operating limits.
reduce speed to (speed) - An ATC procedure used to
request pilots to adjust aircraft speed to a specific value
for the purpose of providing desired spacing. Pilots are
expected to maintain a speed of plus or minus 10 knots
or 0.02 mach number of the specified speed.
reduction factor - A constant (usually 100 or 1,000) by
which a moment is divided to obtain a moment index.
A moment index is used to simplify weight and balance
comvutations.
reduction gear train - The gear arrangement of an
operating unit in which the output shaft turns slower
than the input shaft. An example of this is a gear
arrangement in an aircraft engine that allows the engine
to turn at a faster speed than the propeller.
reduction gears - The gear arrangement in an aircraft
engine that allows the engine to turn at a faster speed
than the propeller.
Reference designators are stackable, meaning a full
reference designator identifies the major assembly,
subassemblies, and the actual component.
reference dimensions - The dimensions on an
installation drawing required to illustrate the
relationship between two parts.
reference junction - One of the two junctions in a
thermocouple system. The reference junction is held at
a constant or stable temperature to serve as a reference
for the measuring junction.
reference pressure - The pressure in the outflow valve
control established by cabin air pressure flowing
through the cabin air filter and orifice. It is metered by
the reference pressure metering valve.
refining - A petroleum extraction process in which
crude oil is broken down into all of its different parts.
reflective - A reflective student considers all
possibilities or alternatives before making a decision.
reflector -A
surface that reflects light.
refrigerant - A fluid used in an air conditioning system
to absorb heat from the cabin and carry it to a radiator
where it can be transferred to the outside air.
refrigerant - 12 - Dichlorodifluoromethane, a chemical
compound used in many aircraft air conditioning
systems. Also referred to as R- 12.
regeneration - A process in an electrical circuit in
which part of the output is fed back to the input to
causes amplification.
regenerative braking - A method of slowing a motor
by switching the wiring effectively to make it into a
generator. This applies a load to the rotating mass and
slows the motor.
Reed and Prince screw - A
recessed-head, cross-point regional checkout - A checkout that goes beyond
screw driven by a special
learning about a particular airplane and encompasses
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