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crystals have a definite shape.
ampere (A). A measure of electron (current) flow. One ampere is equal to a flow of one coulomb (6.28
billion billion electrons) past a point in one second.
One ampere is also the amount of current that can be forced through one ohm of resistance by a
pressure of one volt. See coulomb.
ampere-hour. The quantity of electricity that passes through a circuit when one ampere flows for one hour.
ampere-hour capacity. A rating that indicates the amount of electrical energy a battery can supply. The
ampere-hour rating is the product of the current flow in amperes, multiplied by the length of time, in hours,
the battery can supply this current. A 35-ampere-hour battery can supply seven amperes of current for five
hours, or one ampere for 35 hours.
ampere-hour meter. An electrical meter that measures the amount of current per unit of time used in a
circuit.
ampere-turn. A measure of magnetomotive force (mmf) of an electromagnet. One ampere turn is the
amount of mmf produced when one ampere of current flows through one turn of wire in a coil. One ampere
turn is equal to 1.26 gilberts.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 33
amphibian aircraft. An aircraft with a landing gear that allows it to operate from either water or land
surfaces.
amphibious floats. Floats which may be attached to an aircraft to allow it to operate from either land or
water. Retractable wheels mounted inside the floats can be extended for operation on land.
amplification (electrical characteristic). The increase in either voltage or current that takes place in a
device or an electrical circuit. Amplification is normally measured as a ratio of the output quantity to the
input quantity.
amplification factor. The ratio of the amplitude of the output of an electrical or electronic circuit, to the
amplitude of its input.
amplifier. An electronic circuit in which a small change in voltage or current at its input controls a much
larger change in voltage or current at its output.
amplitude. The amount a value changes from its at-rest, or normal, condition to its maximum condition.
amplitude modulation. See AM.
AMS (Aeronautical Materials Specifications). Materials and process specifications for aircraft
components which conform to established engineering and metallurgical practices in the aircraft industries.
AMT (Aviation Maintenance Technician). A classification of aviation maintenance personnel
certification included in the proposed 14 CFR Part 66 (Aviation Maintenance Personnel). AMT
certification indicates that the holder is authorized to perform certain maintenance and inspection functions
on airframes and powerplants certificated in the United States.
An AMT certificate with an Aircraft rating replaces the Mechanic certificate with Airframe and
Powerplant ratings issued under 14 CFR Part 65 (Airmen Other Than Flight Crewmembers).
AMT(T) (Aviation Maintenance Technician (Transport)). A classification of aviation maintenance
personnel certification included in the proposed 14 CFR Part 66 (Aviation Maintenance Personnel).
AMT(T) certification indicates that the holder is authorized to perform certain maintenance and inspection
functions on transport category aircraft in the United States.
anaerobic resin. A single-component polyester resin that hardens when all air is excluded from it.
AN aeronautical standard drawings. Dimensional standards for aircraft fasteners developed by the
Aeronautical Standards Group. Part numbers for the fasteners described in these drawings carry the prefix
AN.
analog. A physical variable that keeps a fixed relationship with another variable as it changes. For example,
the position of the hands of a clock keeps a fixed relationship with time. It is because of this relationship
that we can tell the time of day by knowing the positions of the clock hands. The position of the clock
hands is an analog of time.
analog computer. An electronic computer which operates by converting different levels of voltage or
current into numerical values in the decimal number system. One level of voltage (or current) represents the
number one, another level represents two, and so on. Adding or subtracting the voltages (or currents) which
are analogs of the numbers produces a voltage (or current) which is the electrical equivalent of the sum or
the difference of the numbers.
There are also mechanical analog computers that combine mechanical analogs of numbers to solve
mathematical problems.
analog data. Data or information represented by a continuously varying voltage or current. Analog data
differs from digital data in that digital data has only two conditions: high and low, on and off, or one and
　
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