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Aeronautical Information Manual (AIM), page 704

Pilot/Controller Glossary 12/10/15

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 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- 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
APPROACHES- 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 4300 feet
between centerlines. Aircraft are permitted 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)
DEPENDENT 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.
SIMULTANEOUS (CONVERGING)
INDEPENDENT APPROACHES- An approach
operation permitting ILS/RNAV/GLS approaches to
non-parallel runways where approach procedure
design maintains the required aircraft spacing
throughout the approach and missed approach and
hence the operations may be conducted
independently.

SIMULTANEOUS ILS APPROACHES- An
approach system permitting simultaneous ILS
approaches to airports having parallel runways
separated by at least 4,300 feet between centerlines.
Integral parts of a total system are ILS, radar,
communications, ATC procedures, and appropriate
airborne equipment.
(See PARALLEL RUNWAYS.)
(Refer to AIM.)

SIMULTANEOUS OFFSET INSTRUMENT

APPROACH (SOIA)- An instrument landing
system comprised of an ILS PRM, RNAV PRM or
GLS PRM approach to one runway and an offset
LDA PRM with glideslope or an RNAV PRM or
GLS PRM approach utilizing vertical guidance to
another where parallel runway spaced less than 3,000
feet and at least 750 feet apart. The approach courses
converge by 2.5 to 3 degrees. Simultaneous close
parallel PRM approach procedures apply up to the
point where the approach course separation becomes
3,000 feet, at the offset MAP. From the offset MAP
to the runway threshold, visual separation by the
aircraft conducting the offset approach is utilized.
(Refer to AIM)
SIMULTANEOUS (PARALLEL) DEPENDENT
APPROACHES- An approach operation permitting
ILS/RNAV/GLS approaches to adjacent parallel
runways where prescribed diagonal spacing must be

PCG S-4

Page 704 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   703 -- Page 704 -- 705