the Aviation Dictionary

resultant flux . reverse polarity welding
resultant flux - The flux in a magnetic circuit of an
aircraft magneto. Resultant of the flux of the rotating
permanent magnet and the flux that surrounds the
primary windings when primary current is flowing.
resultant lift - The vector sum of the magnitude and
direction of all of the lift forces produced by an airfoil.
resultant relative wind - In rotorcraft, airflow from
rotation that is modified by induced flow.
resume normal speed - Used by ATC to advise a pilot
that previously issued speed control restriction; are
deleted. An instruction to "resume normal speed" does
not delete speed restrictions that are applicable to
published procedures of upcoming segments of flight,
unless specifically stated by ATC. This does not relieve
the pilot of those speed restrictions that are applicable
to FAR91.117.
resume own navigation - Used by ATC to advise a
pilot to resume his own navigational responsibility. It is
issued after completion of a radar vector or when radar
contact is lost while the aircraft is being - radar vectored.
retard -To
slow or delay the progress of something.
retard breaker points - An auxiliary set of breaker
points in a magneto equipped with the Shower of
Sparks starting system. These points are operative only
during the starting cycle and open later than the run, or
normal, points. This provides a late or retarded spark.
Also referred to as retard points.
retard points - An auxiliary set of breaker points in a
magneto equipped with the Shower of Sparks starting
system. These points are operative only during the
starting cycle and open later than the run, or normal,
points. This provides a late or retarded spark. Also
referred to as retard breaker points.
retarder - A slow-drying solvent used to prevent
blushing or to provide a more glossy finish by allowing
the finish a longer flow-out time.
retention - There are five principles that promote deep
learning and enhance retention of course material:
praise stimulates remembering, recall is promoted by
association, favorable attitudes aid retention, leaming
with all the senses is most effective, and meaningful
repetition aids recall.
retentivity - The ability of a material to retain its
magnetic properties.
retina - The photosensitive portion of the eye, made up
of cells called rods and cones, that is connected to the
optic nerve.
retirement schedule -A list of limited life parts and the
times when they must be replaced. This list records the
part, serial number, time installed, and removal time.
retort - A laboratory vessel with a long tube used to
distill substances by heat.
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retract - To pull in or draw back.
retractable gear - This is a pilot controllable landing
gear system, whereby the gear can be stowed alongside
or inside the structure of the airplane during flight.
retractable landing gear - Landing gear that folds into
the aircraft structure to reduce parasite drag.
retraction test - The portion of an aircraft inspection in
which the airplane is put on jacks and the landing gear
cycled through its retraction and extension sequences.
retread - In tire recapping, a tire that has been renewed
to serviceable condition. Tires that meet injury
limitations can be recapped. Retreading or recapping
means reconditioning of a tire by renewing the tread, or
renewing the tread plus one or both sidewalls.
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retreating blade - In rotorcraff. any blade, located in a
semicircular part of the rotor disc, where the blade
direction is opposite to the direction of flight.
retreating blade stall - In rotorcraft, a stall that begins
at or near the tir, of a blade in a helicopter because of
the high anglesA of attack required to compensate for
dissymmetry of lift. In a gyroplane the stall occurs at
20 to 40 percent outboard from the hub.
retrofit - To furnish something with new or modified
parts or equipment not available or considered
necessary at the time the part was manufactured.
return flow - The upper branch of a thermal circulation.
return stroke - Lightning that is visible to the eye and
marks the path of the positive charge of the step leader
back into the clouds.
return to service - The completion of all applicable
maintenance records and forms after maintenance has
been verformed on an aircraft that will allow the
aircraft to be legally flown.
revalidate - To confirm, sanction or make socething
valid again.
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reverse bias - The polarity relationship between a
power supply and a semiconductor that does not allow
conduction of current.
reverse idle - A power lever position where the thrust
reversers are deployed, but engine power is idle.
reverse pitch - An angle to which the propeller blade
can be turned in order to provide reverse thrust from
the propeller.
reverse polarity welding - In electric arc welding,
reverse polarity occurs when the electrode is positive
and the- work is negative. The opposite is
called straight polarity. Straight polarity puts more heat
into the work piece, while reverse polarity minimizes
the heat in the work ~iece.