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abampere. A basic unit of electrical current in the electromagnetic-centimeter-gram-second system. One
abampere is equal to 10 amperes in the absolute meter-kilogram-second-ampere system. The abbreviation
for abampere is aA.
A-battery. A dry-cell battery used in vacuum tube radios to supply power to the heaters, or filaments, of
the tubes.
A-batteries usually have a voltage ranging between 1.5 to 6.0 volts and are capable of supplying a
reasonable amount of current.
abbreviated IFR flight plan (air traffic control). An authorization by ATC requiring pilots to submit
only that information needed for the purpose of separation and control. An abbreviated flight plan includes
only a small portion of the usual IFR flight plan information which may be only aircraft identification,
location, and pilot request.
Abbreviated flight plans are frequently used by aircraft which are airborne and desire an
instrument approach, or by aircraft which are on the ground and desire a climb to VFR-On-Top.
abcoulomb. A basic unit of electrical charge in the electromagnetic-centimeter-gram-second system. One
abcoulomb is equal to 10 coulombs in the absolute meter-kilogram-second-ampere system. The
abbreviation for abcoulomb is aC.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 3
abeam. A relative location approximately at right angles to the longitudinal axis of an aircraft. When an
object is beside the aircraft, it is said to be abeam of it.
abfarad. A basic unit of electrical capacitance in the electromagnetic-centimeter-gram-second system. One
abfarad is equal to 109 farads in the absolute meter-kilogram-second-ampere system. The abbreviation for
abfarad is aF.
abhenry. A basic unit of electrical inductance in the electromagnetic-centimeter-gram-second system. One
abhenry is equal to 10-9 henries in the absolute meter-kilogram-second-ampere system. The abbreviation
for abhenry is aH.
abmho. A basic unit of electrical conductance in the electromagnetic-centimeter-gram-second system. One
abmho is equal to 109 mhos in the absolute meter-kilogram-second-ampere system. The abbreviation for
abmho is (aΩ)-1. An abmho is also known as an absiemens, aS.
abort. To terminate an operation prematurely when it is seen that the desired results will not be obtained.
aborted start (gas turbine engine operation). Termination of the start procedures in a gas turbine engine
when it is seen that normal combustion has not taken place within the prescribed time limits.
aborted takeoff. A takeoff terminated prematurely when it is determined that some condition exists which
makes takeoff or further flight dangerous.
abradable seal (gas turbine engine component). A general term for a knife-edge seal inside a gas turbine
engine that wears away (abrades) slightly to produce an extremely close fit between a rotating and a
stationary part of the engine.
abradable shroud (gas turbine engine component). A special shroud ring built into the outer turbine case
of a gas turbine engine. The shroud fits tightly around the outside of the turbine wheel, which is equipped
with special knife edges around its periphery.
If the turbine blades creep (grow in length because of heat and high centrifugal loads), the knife
edges will wear away the abradable shroud and do no damage.
abradable strip (gas turbine engine component). A strip of material in the compressor housing of some
axial-flow gas turbine engines.
The tip of the compressor blade touches the abradable strip and actually wears, or abrades, a
groove in it. This groove ensures that the blade operates with the minimum amount of tip clearance.
abradable tip (compressor blade tip). The tip of some axial-flow compressor blades made in such a way
that it will abrade, or wear away, when it contacts the compressor housing. The abradable tip wears away to
allow the engine to have a minimum amount of tip clearance between the blade and the housing.
abrade. To wear away a surface or a part by mechanical or chemical action.
A rough surface may be made smooth by mechanically abrading it with sandpaper. Extremely
smooth surfaces may be roughened enough for paint to adhere by rubbing the surface with abrasive paper
or by chemically abrading it with an etching solution.
abrasion. A form of damage to a surface made by roughening or wearing it away with scratches or gouges.
Abrasion is often caused by foreign matter trapped between two surfaces having relative motion between
them.
abrasion resistant. The ability of a material to resist damage by abrasion.
abrasive. A material containing minute particles of a hard substance used to wear away a softer surface.
Aluminum oxide, silicon carbide, and glass beads are abrasives commonly used in aircraft maintenance.
　
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