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high enough for the engine to function.
ramp (aircraft service area). A paved area on an airport, usually around the hangars where aircraft can be
parked. Most ramps have provision for securing aircraft so they will not be blown away by strong winds.
Ramps are also called aprons and tarmacs.
ram pressure. Pressure produced when a moving fluid is stopped.
ramp weight. The total weight of a loaded aircraft. The ramp weight includes all the fuel, and it is greater
than the takeoff weight by the weight of the fuel that will be burned during the taxi and run-up operations.
Ramp weight is also called taxi weight.
ram recovery (gas turbine engine parameter). The slight increase in thrust produced by a gas turbine
engine, caused by the increase in air density as the air is rammed into the inlet duct by the forward
movement of the aircraft.
ram-recovery speed. The speed at which the ram effect caused by the forward movement of the aircraft
increases the air pressure at the compressor inlet until it is the same as that of the ambient air.
range markings. Colored marks on an aircraft instrument dial that identify certain ranges of operation as
specified in the aircraft maintenance or flight manual and listed in the appropriate aircraft Type Certificate
Data Sheets or Aircraft Specifications. Color-coding directs attention to approaching operating difficulties.
These ranges and colors are the most generally used:
Red radial line — do not exceed.
Green arc — normal operating range.
Yellow arc — caution range.
Blue radial line — used on airspeed indicators to show best single-engine rate-of-climb speed.
White arc — used on airspeed indicators to show flap operating range.
range resolution (radar technology). The ability of radar to distinguish between targets along the same
azimuth, but at different ranges.
Rankine temperature (absolute temperature scale). The absolute temperature which uses the same
increments as the Fahrenheit scale. All molecular activity stops at 0°R; water freezes at 492°R and boils at
672°R. See temperature.
rasp (woodworking tool). A coarse-toothed tool, similar to a file used for cutting wood. A rasp has
individual cutting points, rather than lines of teeth, as on a file.
ratchet. A device that allows rotation of a wheel or handle in one direction, but prevents its turning in the
opposite direction. A ratchet assembly consists of a toothed wheel and a pawl. The pawl is a lever that rides
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 475
over the teeth when the wheel is turned in one direction, but engages the teeth to prevent the wheel turning
in the opposite direction. Most ratchets have a method of reversing the pawl so the ratchet will work in
either direction.
ratchet coupling. A coupling between two rotating shafts that allows one shaft to drive the other, but will
not allow the driven shaft to rotate the drive shaft.
ratchet handle (mechanic’s hand tool). A handle that has a ratchet built into its head, and used to drive a
socket wrench. Back-and-forth movement of the handle causes the socket to rotate in one direction. By
reversing the pawl in the ratchet head, the same back-and-forth movement of the handle will rotate the
socket in the opposite direction.
rated continuous OEI (one engine inoperative) power. 14 CFR Part 1: “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 Part 33 of this
chapter, and limited in use to the time required to complete the flight after the failure of one engine of a
multiengine rotorcraft.”
rated horsepower (aircraft engine specification). The horsepower the engine manufacturer guarantees an
engine will produce under specified conditions.
rated maximum continuous augmented thrust. 14 CFR Part 1: “With respect to turbojet engine type
certification, means the approved jet thrust that is developed statically or in flight, in standard atmosphere
at a specified altitude, with fluid injection or with the burning of fuel in a separate combustion chamber,
within the engine operating limitations established under Part 33 of this chapter, and approved for
unrestricted periods of use.”
rated maximum continuous power. 14 CFR Part 1: “With respect to reciprocating, turbopropeller, and
turboshaft engines, means the approved brake horsepower that is developed statically or in flight, in
standard atmosphere at a specified altitude, within the engine operating limitations established under Part
33, and approved for unrestricted periods of use.”
　
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