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degrees of latitude and longitude, which is established
for the purpose of providing separation, as a
reporting point, or to delineate a route of flight.
SIMPLIFIED DIRECTIONAL FACILITY− A NAVAID
used for nonprecision instrument approaches.
The final approach course is similar to that of an ILS
localizer except that the SDF course may be offset
from the runway, generally not more than 3 degrees,
and the course may be wider than the localizer,
resulting in a lower degree of accuracy.
(Refer to AIM.)
SIMULATED FLAMEOUT− A practice approach
by a jet aircraft (normally military) at idle thrust to a
runway. The approach may start at a runway (high
key) and may continue on a relatively high and wide
downwind leg with a continuous turn to final. It
terminates in landing or low approach. The purpose
of this approach is to simulate a flameout.
(See FLAMEOUT.)
SIMULTANEOUS ILS APPROACHES− An approach
system permitting simultaneous ILS/MLS
approaches to airports having parallel runways
separated by at least 4,300 feet between centerlines.
Integral parts of a total system are ILS/MLS, radar,
communications, ATC procedures, and appropriate
airborne equipment.
(See PARALLEL RUNWAYS.)
(Refer to AIM.)
SIMULTANEOUS MLS APPROACHES−
(See SIMULTANEOUS ILS APPROACHES.)
SINGLE DIRECTION ROUTES− Preferred IFR
Routes which are sometimes depicted on high
altitude en route charts and which are normally flown
in one direction only.
(See PREFERRED IFR ROUTES.)
(Refer to AIRPORT/FACILITY DIRECTORY.)
SINGLE FREQUENCY APPROACH− A service
provided under a letter of agreement to military
single-piloted turbojet aircraft which 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 en route
descent are required to change frequency when
control is transferred from the air route traffic control
center to the terminal facility. The abbreviation
“SFA” in the DOD FLIP IFR Supplement under
“Communications” indicates this service is available
at an aerodrome.
SINGLE-PILOTED AIRCRAFT− A military turbojet
aircraft possessing one set of flight controls,
tandem cockpits, or two sets of flight controls but
operated by one pilot is considered single-piloted by
Pilot/Controller Glossary 8/5/04
PCG S−4
ATC when determining the appropriate air traffic
service to be applied.
(See SINGLE FREQUENCY APPROACH.)
SKYSPOTTER− A pilot who has received specialized
training in observing and reporting inflight
weather phenomena.
SLASH− A radar beacon reply displayed as an
elongated target.
SLDI−
(See SECTOR LIST DROP INTERVAL.)
SLOT TIME−
(See METER FIX TIME/SLOT TIME.)
SLOW TAXI− To taxi a float plane at low power or
low RPM.
SN−
(See SYSTEM STRATEGIC NAVIGATION.)
SPEAK SLOWER− Used in verbal communications
as a request to reduce speech rate.
SPECIAL ACTIVITY AIRSPACE (SAA)− Any
airspace with defined dimensions within the National
Airspace System wherein limitations may be imposed
upon aircraft operations. This airspace may be
restricted areas, prohibited areas, military operations
areas, air ATC assigned airspace, and any other
designated airspace areas. The dimensions of this
airspace are programmed into URET and can be
designated as either active or inactive by screen entry.
Aircraft trajectories are constantly tested against the
dimensions of active areas and alerts issued to the
applicable sectors when violations are predicted.
(See USER REQUEST EVALUATION TOOL.)
SPECIAL EMERGENCY− A condition of air piracy
or other hostile act by a person(s) aboard an aircraft
which threatens the safety of the aircraft or its
passengers.
SPECIAL INSTRUMENT APPROACH PROCEDURE−
(See INSTRUMENT APPROACH PROCEDURE.)
SPECIAL USE AIRSPACE− Airspace of defined
dimensions identified by an area on the surface of the
earth wherein activities must be confined because of
their nature and/or wherein limitations may be
imposed upon aircraft operations that are not a part of
those activities. Types of special use airspace are:
a. Alert Area− Airspace which may contain a high
volume of pilot training activities or an unusual type
of aerial activity, neither of which is hazardous to
aircraft. Alert Areas are depicted on aeronautical
　
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