- 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 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 enough that the insulated thermocouple remains at the same temperature as the measuring thermocouples, no signal is sent to the fire warning system. But if a fire occurs and the measuring thermocouple gets hot before the insulated reference thermocouple, a voltage is produced that causes a current to flow and actuate the fire warning system.
Industry:Aviation
A type of fire detection system which uses two conductors, separated by a thermistor material, formed into a continuous loop that surrounds the area being protected.
A thermistor is an electrical insulator at normal temperature, but becomes a conductor when heated. When a fire occurs, the thermistor conducts electricity and completes the fire warning circuit. This turns on the fire warning light and starts the fire warning horn or bell.
Industry:Aviation
A type of fit used when assembling certain mechanical devices. To create an interference fit, a hole is made smaller than the part that fits into it. The material containing the hole is heated to expand the hole, and the object to fit in the hole is chilled to shrink it. The parts are easily assembled when one is hot and the other is cold, but when they reach the same temperature, the fit is so tight they will not loosen in service.
Industry:Aviation
A type of fitting used on a fluid line that forms its seal without being flared. Flareless fittings use a compression sleeve around the end of the tube. The sleeve fits into a recess in the fitting, and when the nut is tightened, the sleeve is forced tightly between the tube and the fitting, making a fluid-tight seal.
Industry:Aviation
A type of flexible, braided insulating material put over a wire or a bundle of wires to protect it against physical damage caused by heat or abrasion.
Industry:Aviation
A type of flight in which the aircraft, usually a glider or sailplane, flies without the use of engine power. The aircraft is normally pulled into the air with a powered airplane and, when released, it glides down. The pilot circles in a column of rising air, and as long as the air is rising faster than the aircraft is descending, the aircraft goes up in altitude. As soon as an altitude is reached where the air is no longer rising, the pilot leaves that column and searches out another, to continue the flight.
Industry:Aviation
A type of flight practice in which the pilot makes a series of landings and takeoffs. The landing is made, but the aircraft is not allowed to come to a complete stop before power is applied and the takeoff is made.
Industry:Aviation
A type of flow control valve that allows one system to fully operate before another system begins its operation. Sequence valves are used in aircraft hydraulic systems to cause the wheel well doors to open fully before the landing gear is released from its uplocks.
Industry:Aviation
A type of flow control valve used in a fluid power system to allow fluid to flow in one direction but not in the other.
A ball check valve contains a spring-loaded ball that seats in one side of the valve. The ball is forced tightly against its seat by fluid entering the valve from the end containing the spring, and the fluid cannot flow through the valve. Pressure on the side of the valve containing the ball forces the ball off its seat and fluid flows through the valve. Fluid flowing through the valve is opposed only by the force of the spring.
Industry:Aviation
