the Aviation Dictionary

starter solenoid static stability
starter solenoid - An electrically operated switch that
uses a small current controlled from the cockpit to
close the high current-carrying contacts in the starter
circuit.
starter-generator - A combined unit used on turbine
engines The device acts as a starter for rotating the
engine, and after running, internal circuits are shifted to
convert the device into a generator.
starting torque - The amount of rotating force a motor
develops during start. Series-wound motors develop
high starting torque while shunt- (parallel) wound
motors develop very low starting torque.
starved area - In composites, an area in a plastic part
that has an insufficient amount of resin to wet out the
reinforcement completely.
starved joint - In composites, an adhesive joint that has
been deprived of the proper film thickness of adhesive
due to insufficient adhesive spreading or to the
application of excessive pressure during the lamination
process.
statcoulomb - The amount of charge on each of two
bodies 1 cm apart that causes them to exert a force of 1
dyne on each other. The statcoulomb is the charge
resulting from the addition of approximately 2 x lo9
electrons to a body.
state aircraft - Aircraft used in military, customs and
police service, in the exclusive service of any
government, or of any political subdivision, thereof
including the government of any state, territory, or
possession of the United States or the District of
Columbia, but not including any government-owned
aircraft engaged in carrying persons or property for
commercial purposes.
state of charge - A measurement of the percent of
charge condition of a battery. For lead-acid batteries,
the state of charge is measured by determining the
specific gravity of the electrolyte. The state of charge
of a nickel-cadmium battery can only be determined by
a measured discharge.
statement of demonstrated ability (SODA) - The
official term for a waiver. This is a form that can be
issued in conjunction with a student's medical exam.
SODAS can only be issued by the FAA's federal air
surgeon and are granted for a condition normally
requiring a denial that is not necessarily a safety factor.
static - 1. Still. Not moving. A condition of rest. 2. The
noise produced in a radio or television receiver by
atmospheric or man-made electrical disturbances.
static balance - 1. A condition of balance that does not
involve any dynamic forces. 2. When a body stands in
any - position as the result of counterbalancing andor
A -
reducing heavy portions, it is said to be in standing or
static balance.
static charge - The electrical charge that builds up on a
nonconductive surface by friction. Friction between the
airframe and the air creates a static charge.
static discharger - A device used to dissipate static
electricity from a control surface before it builds up to
a highly charged state.
static electricity - An electrical charge that can be built
up on a nonconductive surface by friction.
static flux - Concentration of lines of flux in the frame
of a magneto due to the rotation of the magnet. At full
register, lines of flux are at maximum, while at neutral
positions, lines of flux are at minimum.
static friction - The friction on an object when an
attempt is made to slide the object along a surface.
Once in motion the object slides more easily.
static instability - The characteristic of an aircraft that,
when disturbed from a condition of rest, tends to move
it hrther from its original condition.
static interference - The noise in a radio caused by
static electricity moving between two structures having
no common ground.
static port - A small hole, flush with the side of the
aircraft, through which static pressure is taken to
operate the airspeed indicator, altimeter, and vertical
speed indicator.
static pressure - Atmospheric pressure measured at a
point where there is no external disturbance and the
flow of air over the surface is smooth.
static pressure pickup - A part of the static instrument
system. The location on the surface of an aircraft where
static air pressure is picked up from port holes or static
ports. This data is supplied to the altimeter, airspeed
.A
indicator, and vertical speed indicator.
static radial engine - An engine with cylinders
radiating out from a small central crankcase. A
single-throw crankshaft is used for each row of
cylinders. Most single-row radial engines have an odd
number of cylinders, but two or more rows can be used
if more power is required.
static restrictions - Those restrictions that are usually
not subject to change, fixed, in place, andor published.
static RPM - The maximum RPM a reciprocating
engine can produce when the aircraft is not moving
through the air. The static RPM is lower than the RPM
the engine develops while airborne because forward
movement rams additional air pressure into the
carburetor inlet.
static stability - The initial tendency to return to a state
of equilibrium when disturbed from that state.
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