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rated maximum continuous 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, without fluid injection and without 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 takeoff augmented thrust. 14 CFR Part 1: “With respect to turbojet engine type certification,
means the approved jet thrust that is developed statically under standard sea level conditions, 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 limited in use to periods of not over 5 minutes for
takeoff operation.”
rated takeoff power. 14 CFR Part 1: “With respect to reciprocating, turbopropeller, and turbo-shaft
engine type certification, means the approved brake horsepower that is developed statically under standard
sea level conditions, within the engine operating limitations established under Part 33, and limited in use to
periods of not over 5 minutes for takeoff operation.”
rated takeoff thrust. 14 CFR Part 1: “With respect to turbojet engine type certification, means the
approved jet thrust that is developed statically under standard sea level conditions, without fluid injection
and without the burning of fuel in a separate combustion chamber, within the engine operating limitations
established under Part 33 of this chapter, and limited in use to periods of not over 5 minutes for takeoff
operation.”
rated thrust (aircraft engine specification). The amount of thrust the manufacturer of a gas turbine
engine guarantees the engine will produce under certain specified conditions.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 476
rated 30-minute 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 a period of not more than 30 minutes after the failure of one engine of a multiengine
rotorcraft.”
rated 2 1/2-minute 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 a period of not more than 2 1/2 minutes after the failure of one engine of a
multiengine rotorcraft.”
rate gyro. An instrument which measures the rate of rotation of an object about an axis. A spinning
gyroscope precesses, or tilts, when it is rotated in a plane at right angles to its own spin axis. The amount
the gyroscope tilts is proportional to the rate at which it is rotated about an axis at right angles to both its
spin axis and the axis of its precession (the axis about which it tilts). Rate gyros are used in turn and slip
indicators and turn coordinators.
rate-of-climb indicator (aircraft instrument). An instrument used to show the pilot the rate at which the
aircraft is climbing or descending. A rate-of climb indicator is a pressure instrument that compares the
pressures inside and outside a metal capsule inside the instrument case. Static pressure is directed into the
instrument case and also into the capsule, but to get into the capsule, the air must flow through a calibrated
orifice (a tiny hole of a specific size).
When the aircraft is not changing altitude, the pressure inside the capsule is the same as that inside
the instrument case. But when the aircraft is climbing or descending, the orifice causes the pressure inside
the capsule to change more slowly than the pressure inside the case. This lag in the pressure change causes
the capsule to expand or collapse until the pressure equalizes. The amount of expansion or collapse is
measured, and it indicates on the instrument dial as the number of feet-per-minute climb or descent.
Rate-of-climb indicators are also called vertical-speed indicators.
rate-of-temperature-rise fire detector. A type of fire detection system that uses a series of thermocouples
to detect a fire condition by the rate at which the temperature being monitored rises.
A series of thermocouples is placed in the area being protected, and a reference thermocouple in
the area is insulated so its temperature always changes slowly. When the overall temperature rise is slow
　
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