RWM  Read-Write Memory. A memory in which each cell is selected by applying appropriate electrical input sig-nals,and the stored data may be either sensed at the appropriate output terminal or changes in response to other electrical input signals. 
RWY  Runway 
RZ  Return to Zero 
S 
SA  Selective Availability 
SAA  Service Access Area 
SAARU  Secondary Attitude Air Data Reference Unit 
SAE  Society of Automotive Engineers 
SAI  AEEC Systems Architecture and Interfaces Subcommittee 
SAMS  Special Use Airspace Management System 
SAR  Search And Rescue 
SARPS  Standards And Recommended Practices 
SAS  Situational Awareness for Safety 
SAT  Static Air Temperature is the total air temperature cor-rected for the Mach effect. Increases in airspeed cause probe temperature to rise presenting erroneous information. SAT is the outside air temperature if the aircraft could be brought to a stop before measuring temperatures. 
SATCOM  Satellite Communication System 
SB  Service Bulletin 
SBE  Single Bit Error 
SC-186  RTCA Special Committee 186 (Responsible for ADS-B technical standards) 
SCAT  Special Category 
SCAT 1  Special Category 1 (approach) 

SCD  Specification Control Drawing
SCDU  Satellite Control Data Unit
SCID  Software Configuration Index Drawing
SCIU  Radio Altimeter Indicator
SCMU  Special Communications Management Unit
SCPC  Single Carrier Per Channel
SCS  Single Channel Simplex. A communication system
that uses simplex.
SCSI  Small Computer System Interface
SCU  Signal Conditioning Unit