the Aviation Dictionary

reactance - reclaimed oil
reactance - The opposition to the flow of AC made by
an induction coil or a capacitor. Reactance is expressed
in ohms.
reaction - A response to a stimulus or force. An event
or sequence of events caused by another action.
reaction engine - A jet engine that receives thrust only
from the reaction caused by hot gases being - expelled.
-
reaction formation - A defense mechanism where
students protect themselves from dangerous - desires by
not only repressing them, but by actually developing
conscious attitudes and behavior patterns that are just
the opposite. A student can develop a who-cares-whatother-people-think
attitude to cover up feelings of
loneliness and a hunger for acceptance.
reaction turbine - A stator vane and rotor blade
arrangement, whereby the vanes form straight ducts
and the blades form convergent ducts. Gases leaving
the trailing edge of the blades turn the rotor. The design
is common to turbine-type accessories such as
air-starters.
reactive current - A current in an AC circuit not in
phase with the voltage.
reamer - A sharp edged cutting tool used for enlarging
or tapering drilled holes in preparation for work with
close-tolerance parts.
rebreather bag - A bag connected to an oxygen mask
that allows expired air to be mixed with a fixed rate of
oxygen. It allows users to rebreath a portion of each
expired breath.
rebreather oxygen mask - An oxygen mask with a
rebreather bag attached.
receiver - In communication, the listener, reader, or
student who takes in a message containing information
from a source, processes it, reacts with understanding,
and changes behavior in accordance with the message.
receiver autonomous integrity monitoring (RAIM)-
A technique whereby a civil GNSS (Global Navigation
Satellite system) ~eceiver/processor determines the
integrity of the GNSS navigation signals without
reference to sensors or non-DoD integrity systems
other than the receiver itself. This determination is
achieved by a consistency check among redundant
pseudorange measurements.
receiving controller - A controller/facility receiving
control of an aircraft from another controller/ facility.
reactive metal - A metal such as aluminum or
magnesium, which reacts with oxygen to form receiving facility - See receiving controller,
corrosion.
recency - A principle of learning that things learned
reactive power - The power in a reactive AC circuit today are remembered better than things that were
that subtracts from the power that would be present in a learned some time ago. The longer time that passes, the
purely resistive circuit. This represents energy that is less that will be remembered. Instructors use this
alternately stored and released by the action of principle when summarizing the important points at the
inductors and capacitors.
end of a lecture in order that the students will better
reactor - 1. A device in an AC circuit used to add
remember them.
reactance to it. 2. A small coil installed in an reciprocal - A reverse bearing, opposite in direction by
alternating current circuit to furnish inductive reactance 180".
and cancel some of the capacitive reactance in the
circuit.
reciprocating engine - An engine that converts the heat
energy from burning fuel into the reciprocating
read back -Repeat my message back to me. movement of the This movement is converted
reader - A machine that magnifies the information on
microfilm or microfiche so it can be read. Some
readers can make printed paper copies.
readiness - A principle of learning that the eagerness
and single-mindedness of a person toward learning
affect the outcome of the learning experience.
real number - A number that is rational or irrational,
not imaginary.
real power - The power in an AC circuit that is the
product of the voltage and the current in phase with
that voltage. Real power equals the voltage multiplied
by the current multiplied by the power factor.
ream - To enlarge and smooth a drilled hole with a
precision cutting tool called a reamer. A hole is reamed
in preparation for work with close-tolerance parts.
Aircraft Technical Book Company
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into a rotary motion by the connecting rods and
crankshaft.
reciprocating motion - An alternating back-and-forth
motion.
reciprocating saw - A power-driven saw that cuts
material by driving a blade back and forth.
recirculating fan - A fan in an aircraft cabin comfort
system that circulates the air in the cabin without
taking in any outside air.
reclaimed oil - Lubricating oil that has already been
used and is restored to a useful state by removing
impurities.
reconditioning a cell - Procedure of servicing a nicad
battery cell by completely discharging it and then
bringing it and all other cells in the battery back up to a