Pilot/Controller Glossary
12/2/21
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 AIRCRAFT
(STOL)
−
An aircraft which, at some weight within its
approved operating weight, is capable of operating
from a 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 straightin 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 CONVECTIVE SIGMET.)
(See CWA.)
(See ICAO term SIGMET INFORMATION.)
(See SAW.)
(Refer to AIM.)
SIGMET INFORMATION [ICAO]
−
Information
issued by a meteorological watch office concerning
the occurrence or expected occurrence of specified
enroute weather phenomena which may affect the
safety of aircraft operations.
SIGNIFICANT METEOROLOGICAL INFOR-
MATION
−
(See SIGMET.)
SIGNIFICANT POINT
−
A point, whether a named
intersection, a NAVAID, a fix derived from a
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 (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
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 CLOSE PARALLEL AP
PROACHES
−
A simultaneous, independent
approach operation permitting ILS/RNAV/GLS
approaches to airports having parallel runways
separated by at least 3,000 feet and less than
4,300
−
feet between centerlines. Aircraft are permit
ted to pass each other during these simultaneous
operations. Integral parts of a total system are radar,
NTZ monitoring with enhanced FMA color displays
that include aural and visual alerts and predictive
aircraft position software, communications override,
ATC procedures, an Attention All Users Page
(AAUP), PRM in the approach name, and
appropriate ground based and airborne equipment.
High update rate surveillance sensor required for
certain runway or approach course separations.
SIMULTANEOUS (CONVERGING) DEPEND
ENT APPROACHES An approach operation
permitting ILS/RNAV/GLS approaches to runways
or missed approach courses that intersect where
required minimum spacing between the aircraft on
each final approach course is required.
PCG S
−
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