ROM Read Only Memory
ROTHR Relocatable Over-The-Horizon Radar
RPM Revolutions Per Minute
RSP Reversion Select Panel
RT Receiver-Transmitter (rt). Also referred to as a trans-
ceiver (see T/R).
RTA (1) Receiver Transmitter Antenna
(2) Required Time of Arrival
RTCA Radio Technical Commission for Aeronautics
RTF Radiotelephony
RTI Real-Time Interrogate
RTP Reliability Test Plan
RTO Rejected Takeoff
RTP Radio Tuning Panel
RTS Request To Send
RTU Radio Tuning Unit
Runway The act of inadvertently crossing the runway holding
Incursion point without ATC clearance.
RVDT Rotary Voltage Differential Transducer
RVR Runway Visual Range
RVSM Required Vertical Separation Minimums
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
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