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general overheat condition. The detector element consists of a sealed, stainless steel tube filled with a
material that absorbs gas when it is cool and releases it when it is heated. This tube is fitted with a
pressure-actuated switch that initiates a fire warning signal when the tube is heated and releases enough gas
to close the switch.
linear accelerometer. An accelerometer that measures the rate of change of motion in a straight line.
linear actuator (fluid power system component). A device which uses a piston moving inside a cylinder
to change hydraulic or pneumatic pressure into linear (straight line) motion.
linear amplification (electronic amplification). Amplification of a signal in which the amplitude of the
output is directly proportional to the amplitude of the input.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 354
linear change. A change in which the output is directly proportional to the input.
linear control (electrical control). A device that changes its controlling function by the same increments
throughout its complete range of movement. A potentiometer can be made in the form of linear control.
The resistance of a linear potentiometer changes the same amount for each degree of rotation of its control
shaft.
linear integrated circuit (electronic component). An integrated circuit (IC) whose output changes
directly as the input changes. Linear ICs are often called analog ICs. Some of the more commonly used
linear ICs are voltage regulators, comparators, sense amplifiers, and linear amplifiers.
linear operation. An operation in which the output of a device is directly proportional to its input. If the
value of the input increases by ten percent, the output will increase its value by ten percent.
linear taper (electrical resistance). The change in resistance of a potentiometer that varies directly with
the number of degrees of rotation of the potentiometer shaft.
line boring. A method of assuring that all of the bearing cavities for a crankshaft or camshaft are in correct
alignment. A boring bar extends through the crankcase and cuts the inside diameters of all the bearing
cavities so they are concentric.
line loss (electrical power). Electrical power lost in the process of moving current through a transmission
line.
line maintenance (aircraft maintenance). Maintenance that can be done without having to take the
aircraft into a hangar or maintenance dock. Troubleshooting, minor repairs, systems servicing, and the
removal and replacement of many components are classified as line maintenance.
linen. A type of cloth made from yarn spun from fibers of the flax plant. Linen has been used for centuries
as a fine cloth for clothing, and at one time was popular as a fabric for covering airplane structures.
line-of-sight radio reception. A characteristic of certain radio signals that causes them to act in the same
way as light. These signals travel in straight lines and cannot bend around obstructions.
Very-high-frequency (VHF) and ultra-high-frequency (UHF) communications are line-of-sight
transmissions which require a clear path between the transmitting and receiving antennas. The reception
distance of VHF and UHF signals is dependent upon the altitude of the aircraft above the transmitting
antenna.
line voltage (electrical power system). The voltage measured at the power line which supplies power to a
piece of electrical equipment. In an installation using alternating current, this voltage is the effective, or rms,
value of the AC.
line-voltage regulator (electrical system component). A piece of electronic equipment, used to stabilize
the line voltage supplied to a piece of electrical or electronic equipment. Circuits in the line-voltage
regulator increase the output voltage when the load current increases to prevent the output voltage dropping.
And they decrease the voltage when the load decreases, preventing the output voltage rising above the
regulated value.
link rod (radial reciprocating engine component). The rod in a radial engine that connects one of the
piston wrist pins to a knuckle pin on the master rod. Link rods are also called articulated rods. See
articulated connecting rod.
linseed oil. Oil obtained from the seed of the flax plant. Linseed oil is used as a drying agent in some types
of enamel, and as a rust preventive coating inside steel tubing used in welded aircraft structure.
liquid. One of the three physical forms of matter: solid, liquid, and gas. A liquid takes the shape of its
container, but does not expand to fill the entire container. Water and gasoline are examples of liquids.
liquid air. Air that has been changed into its liquid state by lowering its temperature below the boiling
　
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