Pilot/Controller Glossary

8/15/19

PCG S

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4

side of the runway to which the instrument approach
was conducted.

(Refer to AIM.)

SIGMET

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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]

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 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

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(See SIGMET.)

SIGNIFICANT POINT

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 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)

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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

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 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

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 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

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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.

SIMULTANEOUS (CONVERGING) INDEPEND-
ENT APPROACHES- An approach operation
permitting ILS/RNAV/GLS approaches to non-par-
allel 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

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 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)

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 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