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keep heat from the tail pipe of a gas turbine engine from damaging the aircraft structure. Insulation blankets
are usually quilted, to allow the maximum amount of insulating material to be used and at the same time
make the blanket easy to install and hold in place.
insulation resistance. The DC resistance of an electrical insulating material. Resistance specifications
normally list the amount of leakage current allowed for a given applied voltage.
insulation strength. A measure of the amount of electrical stress an insulation can withstand before it
breaks down and conducts. Insulation strength is measured in volts-per-unit of insulation thickness,
normally in volts-per-mil (0.001 inch).
insulator (electrical). A material whose outer shell electrons (valence electrons) are so tightly bound to the
atom that they resist any force that tries to move them from one atom to another. Glass, mica, paper,
ceramics, and certain types of plastic materials are used as insulators in electrical and electronic equipment.
intake valve (reciprocating engine component). The valve in the cylinder of a reciprocating engine
through which the fuel-air mixture passes as it enters the combustion chamber.
integer. A whole number, or counting number. Integers include negative numbers, positive numbers, and
zero.
integral fuel tank (aircraft fuel tank). A fuel tank that is formed by sealing off part of the aircraft
structure and using it to hold fuel. An integral wing tank is called a “wet wing” and is used because of its
weight saving.
The only way to repair an integral fuel tank is by replacing damaged sealant and making riveted
repairs, as is done with any other part of the aircraft structure.
integrated circuit. A tiny chip or wafer of silicon on which is etched, imprinted, or diffused electronic
components such as transistors, diodes, capacitors and resistors with their interconnections.
integrating circuit. An electronic circuit whose output is determined by the sum of all of its inputs.
intensity control (cathode-ray tube). The control for a cathode-ray tube that regulates the quantity of
electrons in the beam that strikes the phosphorescent screen inside the cathode-ray tube. The intensity of
the electron beam determines the amount of light produced by the screen.
intercooler (reciprocating engine installation component). An air-to-air heat exchanger installed
between a turbosupercharger and the carburetor. Intercoolers decrease the temperature of the compressed
air to prevent detonation.
A turbosupercharger compresses the air before it enters the fuel metering system of a reciprocating
engine, and when it is compressed, it becomes too hot to be used. Before it enters the induction system, it is
cooled by passing it through an intercooler.
intercostal. A structural member used in a stressed-skin structure to stiffen the skin between the bulkheads
or other major structural components. An intercostal does not carry stresses from the skin into the structure
supporting the skin.
intercylinder baffles (reciprocating engine component). Pieces of thin sheet metal installed between the
cylinders of an air-cooled aircraft engine to force air to flow through the fins on the cylinders.
interelectrode capacitance. The capacitance between the electrodes in an electron tube (vacuum tube). A
capacitor is simply two conductors separated by an insulator, or dielectric. The electrodes in an electron
tube are the conductors, and the vacuum is the dielectric.
High-frequency signals can feed back from one electrode to another through the interelectrode
capacitance inside a tube. To prevent this feedback, neutralizing circuits must be used.
interelement capacitance. The capacitance inside a bipolar transistor caused by the junction between the
P-material and the N-material.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 327
interference angle (poppet valve dimension). The difference between the angles at which the valve seat
and the valve face are ground. Normally the valve seats are ground with between 0.5° and 1° greater angle
than the valve face. This allows the face to touch the seat with a line contact that provides the best sealing.
interference drag (aerodynamic drag). Parasite drag caused by air flowing over one portion of the
airframe interfering with the smooth flow of air over another portion.
interference fit. 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
　
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