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immediately discharges through this ionized gas.
The frequency of oscillation is determined by the values of the capacitor and the resistor and by
the ionization voltage of the gas in the tube. See sawtooth waveform.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 483
relay (electrical component). An electrically operated switch. One switch contact is mounted on a
movable steel arm, the armature, which is held away from the fixed contact by a spring. When current
flows through the electromagnetic coil of the relay, it pulls the armature down and causes the movable
contact to press tightly against the fixed contact, closing the switch.
Relays are used to remotely control a large amount of current by using a small amount of control
current flowing through the relay coil. Relays are being replaced in many types of electrical equipment with
solid-state components that do the same job, but have no moving parts.
release time (air traffic control). A departure time restriction issued to a pilot by ATC (either directly or
through an authorized relay) when necessary to separate a departing aircraft from other traffic.
reliability. The ability of an aircraft engine to perform its designed functions under widely varying
operating conditions.
relief hole (sheet metal fabrication). A hole drilled at the point at which two bend lines meet in a piece of
sheet metal. When a piece of sheet metal is formed into a pan, a square is cut from the corners of the sheet,
and the sides are bent upward. The metal where the two bends meet will usually buckle and crack.
To prevent this cracking, a relief hole whose diameter is approximately twice the radius of the
bend is drilled at the point the two bends meet. This relief hole spreads the stresses so the metal does not
crack.
relief map. A three-dimensional map in which mountains and valleys are formed so they show the way the
land actually looks.
relief tube. A urinal installed in some special-purpose aircraft.
relief valve. A pressure-control valve that relieves any pressure over the amount for which it is set.
Pressure relief valves are used in both hydraulic and pneumatic systems to prevent damaging high pressures
that could be caused by a malfunctioning pressure regulator, or by thermal expansion of fluid trapped in
portions of the system.
reluctance. Opposition to the passage of lines of magnetic flux through a material. Reluctance in a
magnetic circuit compares with resistance in an electrical circuit.
remainder (mathematics). The number left in a mathematical problem when one number is subtracted
from another. The remainder is also the number left in a division problem when the divisor does not go into
the dividend an even number of times.
remanufactured engine. An aircraft engine that has been completely rebuilt by the original engine
manufacturer or by a facility approved by them. A remanufactured engine is considered to be a zero-time
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 484
engine and is usually given the same warranty as a new engine.
The term “remanufactured” does not have any official meaning to the FAA, but it is often used to
mean the same as the FAA term “rebuilt.” See rebuilt engine.
remote control. Control of an object from a location different from that of the device being controlled.
Remote control can be accomplished by fluid power, by electrical current carried through wires, or by
signals transmitted by radio or light.
remote scope (radar meteorology). A slave radarscope remotely operated from a weather radar.
Rene metal. The registered trade name for a series of high-strength, high-temperature, nickel-chromium
alloys, used in the manufacture of gas turbine engines.
repair. A maintenance procedure in which a damaged component is restored to its original condition or at
least to a condition that allows it to fulfill its design function.
repairman license (Federal Aviation Administration license). A license issued by the Federal Aviation
Administration under 14 CFR Part 65 to a specialist in some form of aircraft maintenance who is employed
by a certificated repair station or airline. The repairman certificate (license) is valid only as long as the
repairman is employed by the company for which the certificate was issued.
Repair Station. A certificated maintenance facility approved by the FAA to perform certain specific
maintenance functions. These facilities are certificated under 14 CFR Part 145.
repeating decimal (mathematics). The decimal equivalent of a fraction in which the denominator does not
go into the numerator an even number of times. The fraction 1/3 gives a repeating decimal: 0.3333333….
　
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