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in accordance with clearances within Class B, C, D,
and E surface areas in weather conditions less than the
basic VFR weather minima. Such operations must be
requested by the pilot and approved by ATC.
(See SPECIAL VFR CONDITIONS.)
(See ICAO term SPECIAL VFR FLIGHT.)
SPEED-
(See AIRSPEED.)
(See GROUND SPEED.)
SPEED ADJUSTMENT- An ATC procedure used to
request pilots to adjust aircraft speed to a specific
value for the purpose of providing desired spacing.
Pilots are expected to maintain a speed of plus or
minus 10 knots or 0.02 Mach number of the specified
speed. Examples of speed adjustments are:
a. “Increase/reduce speed to Mach point (number.)”
b. “Increase/reduce speed to (speed in knots)” or
“Increase/reduce speed (number of knots) knots.”
SPEED BRAKES- Moveable aerodynamic devices
on aircraft that reduce airspeed during descent and
landing.
SPEED SEGMENTS- Portions of the arrival route
between the transition point and the vertex along the
optimum flight path for which speeds and altitudes
are specified. There is one set of arrival speed
segments adapted from each transition point to each
vertex. Each set may contain up to six segments.
SQUAWK (Mode, Code, Function)- Activate
specific modes/codes/functions on the aircraft
transponder; e.g., “Squawk three/alpha, two one zero
five, low.”
(See TRANSPONDER.)
Pilot/Controller Glossary 2/14/08
PCG S-6
STA-
(See SCHEDULED TIME OF ARRIVAL.)
STAGING/QUEUING- The placement, integration,
and segregation of departure aircraft in designated
movement areas of an airport by departure fix, EDCT,
and/or restriction.
STAND BY- Means the controller or pilot must
pause for a few seconds, usually to attend to other
duties of a higher priority. Also means to wait as in
“stand by for clearance.” The caller should
reestablish contact if a delay is lengthy. “Stand by” is
not an approval or denial.
STANDARD INSTRUMENT APPROACH PROCEDURE
(SIAP)-
(See INSTRUMENT APPROACH PROCEDURE.)
STANDARD INSTRUMENT DEPARTURE (SID)-
A preplanned instrument flight rule (IFR) air traffic
control (ATC) departure procedure printed for
pilot/controller use in graphic form to provide
obstacle clearance and a transition from the terminal
area to the appropriate en route structure. SIDs are
primarily designed for system enhancement to
expedite traffic flow and to reduce pilot/controller
workload. ATC clearance must always be received
prior to flying a SID.
(See IFR TAKEOFF MINIMUMS AND
DEPARTURE PROCEDURES.)
(See OBSTACLE DEPARTURE PROCEDURE.)
(Refer to AIM.)
STANDARD RATE TURN- A turn of three degrees
per second.
STANDARD TERMINAL ARRIVAL- A preplanned
instrument flight rule (IFR) air traffic control
arrival procedure published for pilot use in graphic
and/or textual form. STARs provide transition from
the en route structure to an outer fix or an instrument
approach fix/arrival waypoint in the terminal area.
STANDARD TERMINAL ARRIVAL CHARTS-
(See AERONAUTICAL CHART.)
STANDARD TERMINAL AUTOMATION REPLACEMENT
SYSTEM (STARS)-
(See DTAS.)
STAR-
(See STANDARD TERMINAL ARRIVAL.)
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.
STATIC RESTRICTIONS- Those restrictions that
are usually not subject to change, fixed, in place,
and/or published.
STATIONARY RESERVATIONS- Altitude reservations
which encompass activities in a fixed area.
Stationary reservations may include activities, such
as special tests of weapons systems or equipment,
certain U.S. Navy carrier, fleet, and anti‐submarine
operations, rocket, missile and drone operations, and
certain aerial refueling or similar operations.
STEP TAXI- To taxi a float plane at full power or
high RPM.
STEP TURN- A maneuver used to put a float plane
in a planing configuration prior to entering an active
sea lane for takeoff. The STEP TURN maneuver
should only be used upon pilot request.
STEPDOWN FIX- A fix permitting additional
descent within a segment of an instrument approach
procedure by identifying a point at which a
controlling obstacle has been safely overflown.
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