- Industry: 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 type of flow-control valve used in a fluid power system that causes the components to operate in the correct sequence. Priority valves are used in an aircraft hydraulic system to cause the landing gear doors to open fully before the uplocks release the landing gear.
Industry:Aviation
A type of flow-control valve used to direct pressurized fluid into one side of an actuator, and at the same time, direct the return fluid from the other side of the actuator to the fluid reservoir.
Closed-center selector valves are connected in parallel between the pressure manifold and the return manifold.
Industry:Aviation
A type of fluid pump that moves a specific amount of fluid each time it rotates. Since the pump is always moving fluid, some form of relief valve must be used to relieve pressure when the system cannot use the fluid as fast as the pump moves it. Gear pumps, gerotor pumps, and vane pumps are examples of positive-displacement pumps.
Industry:Aviation
A type of fluid pump whose output can be changed to suit the demands placed on it. A centrifugal pump moves an amount of fluid determined by the opposition at its discharge port. The less opposition there is, the greater the amount of fluid the pump moves.
Variable-displacement piston pumps control their output by either changing the physical distance the pistons move by using a variable wobble plate, or by changing the length of time the intake ports of the cylinders are open.
Industry:Aviation
A type of flush antenna (an antenna even with the surface of the aircraft skin). A part of the metal skin of the aircraft is electrically isolated by an insulating material and is used as the antenna conductor. Skin antennas are used on many high-speed aircraft.
Industry:Aviation
A type of flying machine that has been proposed since the days of Leonardo daVinci (around 1500 AD), but has never been built in a practical form. An ornithopter is supposed to support itself in the air by moving the air with flapping wings.
Industry:Aviation
A type of force feedback used in the automatic flight control systems of some aircraft. Artificial feel produces an opposition to the pilot’s movement of the controls that is proportional to the aerodynamic loads acting on the control surfaces.
Industry:Aviation
A type of formed or extruded structural material having the cross-sectional shape of a hat. Hat channels are attached to flat sheets of metal to stiffen them and give them rigidity.
“Have numbers” (air traffic control). A phrase used by pilots to inform ATC that they have received runway, wind, and altimeter information only.
Industry:Aviation
A type of friction bearing consisting of a removable cylinder made of some material, such as bronze, that has a low coefficient of friction.
The bushing is pressed into a hole, and it is reamed to a size that fits the shaft with the correct amount of clearance for lubrication.
Some bushings are made of Oilite, a porous bronze material that is impregnated with oil and requires no additional lubrication.
Industry:Aviation
A type of friction brake that automatically releases when current flows through the motor windings. As soon as current to the motor is shut off, a spring forces a stationary friction disk against a disk that rotates with the motor armature. The friction prevents the armature turning. An electromagnet pulls the stationary disk away from the rotating disk when current flows in the motor.
Industry:Aviation
