- 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 long-radius taxiway designed and provided with lighting or marking to define the path of aircraft traveling at high speed (up to 60 knots) from the runway center to a point on the center of a taxiway. A high-speed taxiway is also referred to as a long-radius exit or turn-off taxiway and is designed to expedite aircraft turning off the runway after landing, thus reducing runway occupancy time.
Industry:Aviation
A long-range, hyperbolic navigation system that allows a navigator to establish a line of position by measuring the phase difference between a master signal and three slave signals.
These medium-frequency continuous-wave signals are transmitted simultaneously from a land-based master station and three slave stations.
Industry:Aviation
A loop formed in a rigid fluid line to prevent vibration from concentrating stresses that could cause the line to break.
Industry:Aviation
A loose fit between moving parts, used when accuracy of movement is not important. A nut that turns easily over the threads of a screw or bolt is said to have a free fit.
Industry:Aviation
A loud noise, or explosive sound, made by a reciprocating engine when the fuel-air mixture in the induction system is ignited by gases which are still burning inside the cylinder when the intake valve opens.
A lean fuel-air mixture burns more slowly than a rich mixture, and it can still be burning during the time of valve overlap (the time when both the intake and the exhaust valves are open). This causes a backfire.
Industry:Aviation
A loud rattling noise inside the cylinders of a reciprocating engine caused by shock waves produced by detonating fuel. The fuel-air mixture burning inside a cylinder is supposed to move across the face of the piston with a smooth flame front. But if the wrong type or wrong amount of fuel is used, the fuel-air mixture ahead of the flame front gets so hot it explodes.
The explosion, called detonation, causes shock waves and produces a tremendous amount of pressure in the cylinder. The resultant stresses can damage the engine.
Industry:Aviation
A loud, explosive noise heard on the ground when an airplane passes overhead at a speed faster than the speed of sound. Sound-pressure waves build up as the airplane passes through the air, but because the airplane is flying faster than these waves can move out ahead of it, the sound pressure builds up and forms a shock wave.
The shock wave radiates out from the airplane in the form of a cone. When this cone passes over the ground, the pressure difference between the pressure inside the wave and the pressure of the surrounding air causes the loud explosion-like sound.
Industry:Aviation
A low point in an aircraft engine in which lubricating oil collects and is stored or transferred to an external oil tank. A removable sump attached to the bottom of the crankcase of a reciprocating engine is often called an oil pan.
Industry:Aviation
A low, gray cloud layer or sheet with a fairly uniform base. Stratus clouds sometimes appear in ragged patches. They seldom produce precipitation but may produce drizzle or snow grains.
Industry:Aviation
A low-frequency sound, or vibration, produced when two sources of vibration having almost, but not exactly, the same frequency, act on an object at the same time.
For example, in a multi-engine airplane, if one engine is turning at 1,850 RPM and the other is turning at 1,880 RPM, the airframe vibrations caused by these engines will produce a very noticeable beat of 30 cycles per minute. This beat is caused by the difference in the frequency of the two vibrations.
Industry:Aviation
