- 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 split metal pin used to safety a castellated or slotted nut to a bolt. The cotter pin, which is also called a cotter key, is passed through the slots in the nut and the hole drilled through the shank of the bolt. The ends of the pin are spread back over the end of the bolt and the side of the nut to prevent the nut turning on the bolt.
Industry:Aviation
A spot of light on a radar scope caused by a received signal, or a return from a reflecting object. Blips are also called echoes.
Industry:Aviation
A spring in the elevator control system that produces a mechanical force that tries to lower the elevator, and thus the nose of the airplane.
In normal flight this spring force is overcome by the aerodynamic force from the elevator trim tab. But in slow flight with an aft CG position, the trim tab loses its effectiveness and the downspring lowers the nose to prevent a stall.
Industry:Aviation
A spring made of hardened steel wire wound in the form of a spiral. Coil springs may be used to apply force or to absorb shock or vibration. Short, open coil springs are used to cushion compressive loads, and tightly wound coil springs are used to absorb tensile loads. Coil springs can be used to measure force because their deflection is directly proportional to the applied force.
Industry:Aviation
A spring-loaded air valve screwed into a metal tube installed in an aircraft wheel. When the tire mounted on the wheel is being inflated, the stem of the valve core is depressed by the air chuck, and air flows into the tire. When the air chuck is removed, the stem seats in the valve core, and the air is trapped in the tire.
To deflate the tire, the valve stem is depressed, allowing air to flow out through the core.
Industry:Aviation
A spring-loaded coupling between a magneto and an aircraft reciprocating engine that causes the magneto to produce a hot and late spark for starting the engine. The rotating magnet in a magneto must be turned at a fast rate to produce a hot spark, but when the engine is being started, the magneto turns slowly.
Arms inside the impulse coupling contact stop pins in the magneto housing and hold the magnet while the crankshaft turns. A heavy, flat spring winds up as the crankshaft continues to turn, with the magnet held stationary. When the crankshaft turns about thirty degrees past the point at which ignition normally occurs, a cam forces the arms off the stop pins, and the spring spins the magnet at a fast rate.
When the magnet spins, it produces a hot spark. And since the spark occurs late, the piston is moving downward, preventing the engine kicking back. As soon as the engine is running normally, counterweights on the arms sling outward and hold the arms in, away from the stop pins. This keeps the impulse coupling disengaged so it has no effect on the ignition timing for normal engine operation.
Industry:Aviation
A spring-loaded pin or tab that enters a hole or groove when the device to which it is attached is in a certain position. Detents are used on fuel selector valves to provide a positive means of identifying the position in which the valve is fully on and fully off.
Industry:Aviation
A spring-loaded valve in the bottom of the combustor outer case to drain fuel from the combustor after an aborted start.
The combustor drain valve is spring-loaded to its open position, and burner pressure holds it closed when the engine is operating.
Industry:Aviation
A spring-type clip used on the end of an electrical wire to make temporary connections in an electrical circuit. An alligator clip has long, narrow, spring-loaded jaws with meshing teeth.
Industry:Aviation
A stabilized hover of a helicopter or VTOL aircraft used to conduct a performance/power check prior to hover taxi, air taxi, or takeoff.
Industry:Aviation
