the Aviation Dictionary

registration certificate . remanufactured engine
learning how to fly in a specific region. Before flying relative wind - The airflow caused by the motion of the
or giving flight instruction in any unfamiliar aircraft through the air. Relative wind, also called
environment, obtain a regional checkout from a relative airflow is opposite and parallel to the direction
qualified CFI who is experienced in that geographical of flight.
Gea. For example, mountain flying offers some
relaxation oscillator - An electronic oscillator that
breathtaking scenery and wonderful experiences, but it
produces pulses at an interval dependent on one or
also has some unique challenges and can be extremely
more RC time constants.
dangerous to inexperienced pilots.
relay - An electrically operated remote switch with
registration certificate - The document in an airplane
contacts that are closed or opened by an
that contains the name and address of the person to
electromagnetic field.
whom the airplane is registered.
relay question - Used in response to a student's
regulated power supply - An electrical device that
question. The question is redirected to the group in
converts AC voltage to DC output voltage that remains
order to stimulate discussion.
constant under changing - - load conditions.
release film - In composites, a layer of plastic material
Reid vapor pressure - The amount of pressure acting
used in the vacuum bagging process that does not allow
on a liquid to hold the vapors in the liquid at a given
resin to bleed through it. It will not bond to the part
temperature.
when the resins cure. Perforated release film will
reinforce - To strengthen by adding extra support or allow some resin to bleed through.
material.
release time - A departure time restriction issued to a
reinforced shell - The outer skin of an aircraft pilot by ATC (either directly or though an authorized
reinforced by a complete framework of structural relay) when necessary to separate a departing aircraft
members.
from other traffic.
reinforcement - In composites, material used to
strengthen the matrix. Fiber reinforced plastic is an
example. Fibers are used to reinforce the plastic
material.
reinforcing tape - A narrow, woven cotton or polyester
tape used as reinforcement at stitching attachments.
rejuvenation - The restoring of resilience to a dope film
by opening up the film with potent solvents and
allowing the plasticizers in the rejuvenator to replace
those that have migrated from the dope.
rejuvenator - A finishing material consisting of potent
solvents and plasticizers used to restore resilience to
weathered and cracked dope film.
relative bearing - An angular relationship between two
objects measured in degrees clockwise from the twelve
o'clock position of the first object.
relative humidity - The ratio of the existing amount of
water vapor in the air at a given temperature to the
maximum amount that could exist at that temperature;
usually expressed in percent.
relative motion - The motion of one object with
relation to another.
relative movement - The movement of one object with
relation to another.
relative vorticity - Rotation due entirely to the flow of
air at the point being measured. ~bsolute vorticity is
relative vorticity plus rotation imparted by the turning
of the Earth (planetary vorticity).
Aircraft Technical Book Company
P.O. Box 270
Tabernash, CO 80478
http:llw.ACTechbooks.com
release time [ICAO]- Time prior to which an aircraft
should be given further clearance or prior to which it
should not proceed in case of radio failure.
reliability - Producing consistent results on multiple
tests.
relief - The amount one plane surface is set below or
above another plane, usually for clearance or for
economy in machining.
relief hole - A hole drilled in a flat sheet metal part to
allow intersecting bends to be made. The relief hole
prevents the metal kom buckling.
relief map -A map that shows land forms with contour
lines, shading, or color.
relief tube - A urinal on an aircraft that drains
overboard. The discharge area around these tubes is an
area highly susceptible to corrosion.
relief valve - A valve that limits the pressure in a
system by releasing unwanted pressure at a preset
value.
reluctance - 1. The relative difficulty with which
magnetic domains can be aligned. 2. The opposition to
magnetic flux. The opposite
..
of permeability.
remainder - The result of subtracting one number from
another or the amount left when one number does not
divide evenly into another.
remanufactured engine - An engine assembled by the
manufacturer or his authorized agent using used parts
that are held to the new parts' dimensional limits. A
remanufactured engine is given zero time records and