- 行业: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
A form of friction brake used on some airplanes. A drum brake is composed of two curved shoes which have a heat-absorbing friction material bonded to their outer surface. These shoes are pressed outward against the inside of a cylindrical drum that rotates with the wheel.
The brake is applied by hydraulic pressure or mechanical leverage forcing the shoes out against the drum, and a spring pulls them away from the drum when the brake pedal or handle is released.
Industry:Aviation
A form of friction clutch that engages when the drive wheel reaches a certain speed. The clutch is engaged by centrifugal force acting on a flyweight mechanism.
Industry:Aviation
A form of fuel metering system for a reciprocating engine that injects the fuel directly into the cylinder, rather than mixing it with the air before it is taken in through the intake valve. There are two types of fuel injection systems in use, the direct injection system and the continuous-flow injection system.
The direct injection system, such as is used in a diesel engine, sprays the fuel into the cylinder under high pressure. The fuel is atomized by the spray for better combustion.
The continuous-flow fuel injection system used on many of the modern horizontally opposed aircraft engines is not a true injection system. It meters the fuel and delivers it under a low pressure to the outside of the intake valve. This fuel, along with the necessary air for combustion, is pulled into the cylinder when the intake valve opens.
Industry:Aviation
A form of fuel-air heat exchanger in which heat is taken from the compressor bleed air and put into the fuel before it flows through the fuel filter. At high altitude, the temperature is so low that water entrained in the fuel precipitates out and freezes on the fuel filter. The fuel heater warms the fuel enough to prevent the water freezing.
Industry:Aviation
A form of gas turbine engine that uses one or more stages of turbines to drive a set of reduction gears, which in turn drives a propeller. Most of the heat energy in the exhaust gases is converted into torque, rather than into a stream of high-velocity exhaust gases, as is done in a turbojet engine.
Industry:Aviation
A form of gas turbine engine that uses one or more stages of turbines to drive a transmission, which in turn drives the rotors of a helicopter. A turboshaft engine extracts a maximum amount of the heat energy from the exhaust gas to drive the turbine connected to the transmission.
Industry:Aviation
A form of gasket made of thin copper, formed around a core of asbestos. When the component being sealed by this gasket is screwed tightly into its housing, the gasket is crushed so it conforms to the two surfaces and provides a leakproof seal.
Industry:Aviation
A form of graph used to show relationships existing between different values. In a bar graph, each value is represented by a bar of appropriate length. By comparing the lengths of the bars, we can easily visualize the comparison between the different values.
The bars on a bar graph can be either horizontal or vertical.
Industry:Aviation
A form of gripping hand tool having two pivoted handles and two notched, or serrated, jaws. Common slip-joint pliers are used to hold small objects and to cut and bend wire.
Industry:Aviation
A form of gyroscope which uses a spherical rotor made of niobium.
The rotor is suspended in a magnetic field and is operated at a cryogenic (extremely low) temperature. At this temperature the niobium acts as a superconductor.
Industry:Aviation
