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SEGMENTS OF AN INSTRUMENT APPROACH
PROCEDURE− An instrument approach procedure
may have as many as four separate segments
depending on how the approach procedure is structured.
a. Initial Approach− The segment between the
initial approach fix and the intermediate fix or the
point where the aircraft is established on the intermediate
course or final approach course.
(See ICAO term INITIAL APPROACH
SEGMENT.)
b. Intermediate Approach− The segment between
the intermediate fix or point and the final approach
fix.
(See ICAO term INTERMEDIATE APPROACH
SEGMENT.)
c. Final Approach− The segment between the final
approach fix or point and the runway, airport, or
missed approach point.
(See ICAO term FINAL APPROACH SEGMENT.)
d. Missed Approach− The segment between the
missed approach point or the point of arrival at
decision height and the missed approach fix at the
prescribed altitude.
(Refer to 14 CFR Part 97.)
(See ICAO term MISSED APPROACH
PROCEDURE.)
SEPARATION− In air traffic control, the spacing of
aircraft to achieve their safe and orderly movement in
flight and while landing and taking off.
(See SEPARATION MINIMA.)
(See ICAO term SEPARATION.)
SEPARATION [ICAO]− Spacing between aircraft,
levels or tracks.
SEPARATION MINIMA− The minimum longitudinal,
lateral, or vertical distances by which aircraft are
spaced through the application of air traffic control
procedures.
(See SEPARATION.)
SERVICE− A generic term that designates functions
or assistance available from or rendered by air traffic
control. For example, Class C service would denote
the ATC services provided within a Class C airspace
area.
SEVERE WEATHER AVOIDANCE PLAN− An
approved plan to minimize the affect of severe
weather on traffic flows in impacted terminal and/or
ARTCC areas. SWAP is normally implemented to
provide the least disruption to the ATC system when
flight through portions of airspace is difficult or
impossible due to severe weather.
SEVERE WEATHER FORECAST ALERTS− Preliminary
messages issued in order to alert users that
a Severe Weather Watch Bulletin (WW) is being
issued. These messages define areas of possible
severe thunderstorms or tornado activity. The messages
are unscheduled and issued as required by the
National Severe Storm Forecast Center at Kansas
City, Missouri.
(See AIRMET.)
(See CONVECTIVE SIGMET.)
(See CWA.)
(See SIGMET.)
SFA−
(See SINGLE FREQUENCY APPROACH.)
SFO−
(See SIMULATED FLAMEOUT.)
SHF−
(See SUPER HIGH FREQUENCY.)
SHORT RANGE CLEARANCE− A clearance issued
to a departing IFR flight which authorizes IFR
flight to a specific fix short of the destination while
air traffic control facilities are coordinating and
obtaining the complete clearance.
8/5/04 Pilot/Controller Glossary
PCG S−3
SHORT TAKEOFF AND LANDING AIRCRAFT−
An aircraft which, at some weight within its approved
operating weight, is capable of operating from a
STOL runway in compliance with the applicable
STOL characteristics, airworthiness, operations,
noise, and pollution standards.
(See VERTICAL TAKEOFF AND LANDING
AIRCRAFT.)
SIAP−
(See STANDARD INSTRUMENT APPROACH
PROCEDURE.)
SID−
(See STANDARD INSTRUMENT DEPARTURE.)
SIDESTEP MANEUVER− A visual maneuver accomplished
by a pilot at the completion of an
instrument approach to permit a straight-in landing
on a parallel runway not more than 1,200 feet to either
side of the runway to which the instrument approach
was conducted.
(Refer to AIM.)
SIGMET− A weather advisory issued concerning
weather significant to the safety of all aircraft.
SIGMET advisories cover severe and extreme turbulence,
severe icing, and widespread dust or sandstorms
that reduce visibility to less than 3 miles.
(See AIRMET.)
(See AWW.)
(See CONVECTIVE SIGMET.)
(See CWA.)
(See ICAO term SIGMET INFORMATION.)
(Refer to AIM.)
SIGMET INFORMATION [ICAO]− Information
issued by a meteorological watch office concerning
the occurrence or expected occurrence of specified
en-route weather phenomena which may affect the
safety of aircraft operations.
SIGNIFICANT METEOROLOGICAL INFORMATION−
(See SIGMET.)
SIGNIFICANT POINT− A point, whether a named
intersection, a NAVAID, a fix derived from a
NAVAID(s), or geographical coordinate expressed in
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