the Aviation Dictionary

simple motion - single-engine absolute ceiling
simple motion - Newton's law of motion, which states
that objects in motion tend to stay in motion.
simplex communications - A method of
communication where only one transmitter location
can transmit at a time while the other receives.
simplex fuel nozzle - A nozzle with one spray orifice
and one spray pattern.
simplex nozzle - A fuel discharge nozzle for turbine
engines fed from a single fuel manifold.
simplified directional facility (SDF) - A NAVAID
used for nonprecision instrument approaches. The final
approach course is similar to that of an ILS localizer
except that the SDF course can be offset from the
runway, generally not more than 3 degrees, and the
course can be wider than the localizer, resulting in a
lower degree of accuracy.
simulate - To have the characteristics or appearance of
something that is real.
simulated flameout - A practice approach by a jet
aircraft (normally military) at idle thrust to a runway.
The approach can start at a runway (high key) and can
continue on a relatively high and wide downwind leg
with a high rate of descent and a continuous turn to
final. It terminates in a landing or low approach. The
purpose of this approach is to simulate a flameout.
simulator - An enclosed housing that duplicates all of
the controls, instruments, furnishings, and environment
of an actual airplane cockpit. The simulated
environment reproduces the same sensations and
indications found in actual flight.
simultaneous ILS approaches - An approach system
permitting simultaneous ILSMLS approaches to
airports having parallel runways separated by at least
4,300 feet between centerlines. Integral parts of a total
system are ILSIMLS, radar, communications, ATC
procedures, and appropriate airborne equipment.
simultaneous MLS approaches - See simultaneous ILS
approaches.
sine - A trigonometric function found in a 90" triangle.
It is defined as the ratio of the length of the side
opposite an angle to the length of the hypotenuse.
sine curve - 1. A
graphic representation
of the relationship between
an angle and its
sine. 2. The curve
showing the relationship
between the
voltage or current and
the angle through
which the related rotary generator has turned.
sine wave - The wave form of alternating current
produced by a rotary generator. Its amplitude at any
time is proportional to the sine of the angle through
which the generator has turned.
single direction routes - Preferred IFR Routes that are
sometimes depicted on high altitude enroute charts and
which are normally flown in one direction only.
single flare - A flare
used for aircraft rigid
tubing with a flange at
the end of the tube.
When a single flare is
folded back over itself,
it is referred to as a
double flare.
single frequency
approach - A service provided under a letter of
agreement to military single-piloted turbojet aircraft
that permits use of a single UHF frequency during
approach for landing. Pilots will not normally be
required to change frequency from the beginning of the
approach to touchdown except that pilots conducting
an enroute descent are required to change frequency
when control is transferred from the air route traffic
control center to the terminal facility.
single sideband - Radio communications in which one
of the two sidebands used in amplitude modulation is
suppressed.
single spread - A method of applying adhesive to only
one surface of a bonded joint.
single-acting actuator - A linear hydraulic or
pneumatic actuator that uses fluid power for movement
in one direction and a spring force for its return.
single-axis autopilot - An automatic flight control
device that controls the airplane only around the roll
axis.
single-crystal turbine blade - A high temperature
strength blade with no grain boundaries. It is
manufactured by an advanced casting process that
produces the blade from a single crystal of metal.
single-cut file - A hand file with a single row of teeth
extending across the piece at an angle.
single-engine absolute ceiling - In multi engine aircraft,
the density altitude an airplane is capable of reaching
and maintaining with the critical engine feathered and
the other at maximum power. This assumes the
airplane is at maximum weight and in the clean
configuration, flying in smooth air. This is also the
density altitude at which VXsE and VYsE are the same
airspeed. If flying above this altitude and the engine
fails, the plane will inevitably descend until it reaches
the single-engine absolute ceiling.
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