Pilot/Controller Glossary

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 CONVECTIVE SIGMET.)
(See CWA.)
(See GRAPHICAL AIRMEN"S METEOROLOGICAL INFORMATION.)
(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 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 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 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 4,300-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.