the Aviation Dictionary

ram temperature rise rated 30-second OEI (one engine inoperative) power
ram temperature rise - The inlet temperature rise due ratchet handle - A handle with a ratchet coupling used
to inlet ram pressure rise.
to turn socket-type wrenches. A ratcheting mechanism
in the handle allows the socket to be turned in one
ramp - The apron or paved surface around a hangar
direction while the handle is moved with a
used for parking aircraft.
back-and-forth movement. By reversing the catch in
ramp and soak - In composites, a curing process in the ratchet body, the same back-and-forth movement of
which the temperature is slowly raised at a given rate the handle will rotate the socket in the opposite
to the final cure temperature and held for a specific direction.
amount of time. ~fter that time, the temperature is
rate gyro - A device used to measure the rate of an
slowly lowered to room temperature. For example, if
aircraft's rotation about its vertical axis through 360".
the final cure temperature for a part is 250°F, the
A rate gyro is not affected by the roll or pitch of the
temperature would be ramped up to 250" at a rate of 8"
aircraft but aligns itself with the fore and aft line.
per minute. Once it reaches 250°, the temperature is
held there for 1 hour and 30 minutes, and then the rate of burning - The time required for a specific
temperature is lowered to 80" at a rate of 5" per minute. amount of fuel-air mixture to bum or to release its heat
This process is typically done by using a temperature energy.
controller found on hot patch bonding equipment.
rate of climb - The rate, measured in feet per minute, at
ramp weight - The total weight of the aircraft while on which vertical motion occurs.
the ramp. It differs from takeoff weight by the weight
rate of turn - The change of heading per unit of time.
of the fuel that will be consumed in taxiing to the point
For example, 180" per minute, or 3" per second.
of takeoff.
rate of yaw - The rate, in degrees per second, at which
random altitude - An altitude inappropriate for
an aircraft rotates about its vertical axis.
direction of flight andor not in accordance with FAA
Order 7110.65,~ara~ra~h
4-5-1. rate signal - A signal proportional to a rate of change.
random route - Any route not established or
chartedpublished or not otherwise available to all
users.
range-height indicator (RHI) scope - A radar display
with height as the vertical axis and range as the
horizontal axis. A vertical cross section of the cloud
masses in a particular azimuth can be determined.
Rankine Temperature - The absolute temperature
scale using degrees Fahrenheit with minus 460°F as
absolute zero. It is used in many engine performance
calculations.
rapid decompression - The almost instantaneous loss
of cabin pressure in aircraft with a pressurized cockpit
or cabin.
rapid exit taxiway (ICAO) - A taxiway connected to a
runway at an acute angle and designed to allow landing
airplanes to tum off at higher speeds than are achieved
on other exit taxiways thereby minimizing runway
occupancy times.
rarefied air - Of or pertaining to less air. Often used to
describe the Earth's upper atmosphere.
rasp - A coarse file with raised cutting points used for
scraping soft materials such as wood or plastic.
ratchet - A mechanism that consists of a toothed wheel
and a bar, or pawl, which allows the wheel to rotate in
one direction but prevents its backward motion.
ratchet coupling - A toothed wheel into which a pawl
drops so that motion can be imparted to the wheel in
only one direction.
Aircraft Technical Book Company
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rated 2 112-minute OEI (one engine inoperative)
power - With respect to rotorcraft turbine engines,
means the approved brake horsepower developed under
static conditions at specified altitudes and temperatures
within the operating limitations established for the
engine under FAR Part 33, and limited in use to a
period of not more than 2 % minutes after the failure of
one engine of a multiengine rotorcraft.
rated 2-minute OEI (one engine inoperative) power -
With respect to rotorcraft turbine engines, means the
approved brake horsepower developed under static
conditions at specified altitudes and temperatures
within the operating limitations established for the
engine under FAR part 33, for continued one-flight
operation after the failure of one engine in multiengine
rotorcraft, limited to three periods of use no longer than
2 minutes each in any one flight, and followed by
mandatory inspection and prescribed maintenance
action.
rated 30-minute OEI (one engine inoperative) power
-With respect to rotorcraft turbine engines, means the
approved brake horsepower developed under static
conditions at specified altitudes and temperatures
within the operating limitations established for the
engine under FAR Part 33, and limited in use to a
period of not more than 30 minutes after the failure of
one engine of a multiengine rotorcraft.
rated 30-second OEI (one engine inoperative) power
-With respect to rotorcraft turbine engines, means the
approved brake horsepower developed under static
conditions at specified altitudes and temperatures