Abbreviation/
Acronym

Meaning

RCO .
RD
REIL .
REL .
RFM .
RIL
RLIM
RMI .
RNAV
RNP .
ROC .
RPAT

Remote Communications Outlet
Rotor Diameter
Runway End Identifier Lights
Runway Entrance Lights
Rotorcraft Flight Manual
Runway Intersection Lights
Runway Light Intensity Monitor
Radio Magnetic Indicator
Area Navigation
Required Navigation Performance
Required Obstacle Clearance
RNP Parallel Approach Runway
Transitions

RVR .
RVSM
RWSL
SAFO
SAM .
SAR .
SAS .
SATR
SBAS
SCAT-1
DGPS

Runway Visual Range
Reduced Vertical Separation Minimum
Runway Status Light
Safety Alerts For Operators
System Area Monitor
Search and Rescue
Stability Augmentation System
Special Air Traffic Rules
Satellite-based Augmentation System

SDF .
SFL
SFR .
SFRA
SIAP .
SID
SIGMET
SM
SMGCS

Simplified Directional Facility
Sequenced Flashing Lights
Special Flight Rules
Special Flight Rules Area
Standard Instrument Approach Procedure
Standard Instrument Departure
Significant Meteorological Information
Statute Mile
Surface Movement Guidance Control
System

SNR .
SOIA

Signal-to-noise Ratio
Simultaneous Offset Instrument
Approaches

SOP .
SPC .
SPS
STAR
STARS .

Standard Operating Procedure
Storm Prediction Center
Standard Positioning Service
Standard Terminal Arrival
Standard Terminal Automation
Replacement System

STMP

Special Traffic Management Program

TA .
TAA .
TAC .
TACAN

Traffic Advisory
Terminal Arrival Area
Terminal Area Chart
Tactical Air Navigation

Appendix 3-4

Special Category I Differential GPS

Abbreviation/
Acronym

Meaning

TAF .
TAS .
TCAS

Aerodrome Forecast
True Air Speed
Traffic Alert and Collision Avoidance
System

TCH .
TD
TDLS
TDWR .
TDZ .
TDZE
TDZL
TEC .
THL .
TIBS .
TIS
TIS-B
TLS .
TPP
TRSA
TSO .
TWEB .
TWIB

Threshold Crossing Height
Time Difference
Tower Data Link System
Terminal Doppler Weather Radar
Touchdown Zone
Touchdown Zone Elevation
Touchdown Zone Lights
Tower En Route Control
Takeoff Hold Lights
Telephone Information Briefing Service
Traffic Information Service
Traffic Information Service-Broadcast
Transponder Landing System
Terminal Procedures Publications
Terminal Radar Service Area
Technical Standard Order
Transcribed Weather Broadcast
Terminal Weather Information for Pilots
System

UA
UAS .
UAV .
UFO .
UHF .
U.S. .
USCG
UTC .
UWS .

Unmanned Aircraft
Unmanned Aircraft System
Unmanned Aerial Vehicle
Unidentified Flying Object
Ultrahigh Frequency
United States
United States Coast Guard
Coordinated Universal Time
Urgent Weather SIGMET

VAR .
VASI .
VCOA .
VDA .
VDP .
VFR .
VGSI
VHF .
VIP
VMC
VMINI

Volcanic Activity Reporting
Visual Approach Slope Indicator
Visual Climb Over the Airport
Vertical Descent Angle
Visual Descent Point
Visual Flight Rules
Visual Glide Slope Indicator
Very High Frequency
Video Integrator Processor
Visual Meteorological Conditions
Instrument flight minimum speed, utilized
in complying with minimum limit speed
requirements for instrument flight
Vertical Navigation
Never exceed speed

VNAV
VNE .

Abbreviations/Acronyms