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Pilot/Controller Glossary

3/29/18

PCG S−4

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 (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.
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− 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

maintained.  Aircraft are not permitted to pass each