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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 Storm Prediction Center (SPC) at Norman,
Oklahoma.
(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.
SHORT TAKEOFF AND LANDING AIRCRAFTAn
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
Pilot/Controller Glossary 2/14/08
PCG S-4
NAVAID(s), or geographical coordinate expressed in
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,
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