12/2/21
Pilot/Controller Glossary
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
other during simultaneous dependent operations.
Integral parts of a total system ATC procedures, and
appropriate airborne and ground based equipment.
SINGLE DIRECTION ROUTES
−
Preferred IFR
Routes which are sometimes depicted on high
altitude en route charts and which are normally flown
in one direction only.
(See PREFERRED IFR ROUTES.)
(Refer to CHART SUPPLEMENT U.S.)
SINGLE FREQUENCY APPROACH
−
A service
provided under a letter of agreement to military
single-piloted turbojet aircraft which permits use of
a single UHF frequency during approach for landing.
Pilots will not normally be required to change
frequency from the beginning of the approach to
touchdown except that pilots conducting an en route
descent are required to change frequency when
control is transferred from the air route traffic control
center to the terminal facility. The abbreviation
“SFA” in the DOD FLIP IFR Supplement under
“Communications” indicates this service is available
at an aerodrome.
SINGLE-PILOTED AIRCRAFT
−
A military
turbojet aircraft possessing one set of flight controls,
tandem cockpits, or two sets of flight controls but
operated by one pilot is considered single-piloted by
ATC when determining the appropriate air traffic
service to be applied.
(See SINGLE FREQUENCY APPROACH.)
SKYSPOTTER
−
A pilot who has received
specialized training in observing and reporting
inflight weather phenomena.
SLASH
−
A radar beacon reply displayed as an
elongated target.
SLDI
−
(See SECTOR LIST DROP INTERVAL.)
SLOW TAXI
−
To taxi a float plane at low power or
low RPM.
SMALL UNMANNED AIRCRAFT SYSTEM
(sUAS)– An unmanned aircraft weighing less than 55
pounds on takeoff, including everything that is on
board or otherwise attached to the aircraft.
SN
−
(See SYSTEM STRATEGIC NAVIGATION.)
SPACE
−
BASED ADS
−
B (SBA)
−
A constellation of
satellites that receives ADS
−
B Out broadcasts and
relays that information to the appropriate surveil-
lance facility. The currently deployed SBA system is
only capable of receiving broadcasts from 1090ES
−
equipped aircraft, and not from those equipped with
only a universal access transceiver (UAT). Also,
aircraft with a top
−
of
−
fuselage
−
mounted transponder
antenna (required for TCAS II installations) will be
better received by SBA, especially at latitudes below
45 degrees.
(See AUTOMATIC DEPENDENT
SURVEILLANCE
−
BROADCAST.)
(See AUTOMATIC DEPENDENT
SURVEILLANCE
−
BROADCAST OUT.)
SPACE LAUNCH AND REENTRY AREA
−
Locations where commercial space launch and/or
PCG S
−
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