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6/17/21 

Pilot/Controller Glossary 

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.) 

SLOT TIME

 

(See METER FIX TIME/SLOT TIME.) 

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.) 

SPEAK SLOWER

 Used in verbal communications 

as a request to reduce speech rate. 

SPECIAL ACTIVITY AIRSPACE (SAA)

 Any 

airspace with defined dimensions within the National 
Airspace System wherein limitations may be 
imposed upon aircraft operations. This airspace may 
be restricted areas, prohibited areas, military 
operations areas, air ATC assigned airspace, and any 
other designated airspace areas. The dimensions of 
this airspace are programmed into EDST and can be 
designated as either active or inactive by screen entry. 
Aircraft trajectories are constantly tested against the 
dimensions of active areas and alerts issued to the 
applicable sectors when violations are predicted. 

(See 

EN ROUTE DECISION SUPPORT TOOL

.) 

SPECIAL AIR TRAFFIC RULES (SATR)

 Rules 

that govern procedures for conducting flights in 
certain areas listed in 14 CFR Part 93. The term 
“SATR” is used in the United States to describe the 
rules for operations in specific areas designated in the 
Code of Federal Regulations. 

(Refer to 14 CFR Part 93.) 

SPECIAL EMERGENCY

 A condition of air piracy 

or other hostile act by a person(s) aboard an aircraft 

PCG S