- 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 high-velocity narrow stream of winds usually found near the upper limit of the troposphere. The jet stream normally blows from west to east, and the winds in the stream may reach velocities of up to 250 miles per hour.
Industry:Aviation
A high-velocity stream of compressor bleed air blown from a nozzle into an area where vortices are likely to form. Vortex dissipators destroy the vortices that would otherwise suck debris from the ground into engines mounted in pods below the wings.
Industry:Aviation
A high-voltage capacitor that uses thin sheets of mica as the dielectric. Both sides of the mica are electrolytically coated with silver. This silver forms the plates of the capacitor.
Industry:Aviation
A high-voltage rotary selector switch used in an aircraft engine magneto to direct high-voltage electrical energy from the magneto coil secondary winding to the spark plugs at the time they should fire. The rotor of the distributor is gear-driven from the crankshaft.
Industry:Aviation
A high-voltage, positive DC power supply for electronic equipment using electron tubes (vacuum tubes). Plate power supplies are usually called B+ power supplies.
Industry:Aviation
A hinge at the root of a helicopter rotor blade. The axis of the delta hinge lies in the plane of rotation of the blade, and allows the blade to flap up or down to equalize the lift produced by the rotor system as the helicopter moves through the air.
Industry:Aviation
A hinge in the rotor system of a helicopter that allows the individual blades to move back and forth in their plane of rotation. This movement helps minimize vibration. The drag hinge is also called the lead-lag hinge.
Industry:Aviation
A hinged measuring device similar to a pair of dividers. The difference between inside calipers and dividers is that the ends of the caliper’s legs are bent outward so they are at right angles to the legs.
Inside calipers are used to measure the inside diameter of a hole. The legs of the calipers are placed in the hole and spread until the points just touch the outside edges. The calipers are then taken from the hole and the distance between the points measured with a steel scale.
Industry:Aviation
A hole cut in a piece of structural material to get rid of weight, or lighten the structure, without losing any strength. A hole several inches in diameter may be cut in a piece of metal at a point where the metal is not needed for strength; for example, in the web of a wing rib. The edges of the hole are flanged (bent outward) to give the metal rigidity. A piece of metal with flanged lightening holes is more rigid than the metal before the lightening holes were cut.
Industry:Aviation
A hole drilled at the point at which two bend lines meet in a piece of sheet metal. When a piece of sheet metal is formed into a pan, a square is cut from the corners of the sheet, and the sides are bent upward. The metal where the two bends meet will usually buckle and crack.
To prevent this cracking, a relief hole whose diameter is approximately twice the radius of the bend is drilled at the point the two bends meet. This relief hole spreads the stresses so the metal does not crack.
Industry:Aviation
