TM 55-6930-212-10
R - Continued
RTA
Receiver transmitter antenna
RVR
Runway visual range
RW
Reduced visual visibility (random)
S
S
South
SAM
Surface-to-air missile
SDC
Signal data converter
SEC
Second
SEG
Segment
SEL
Selector; select
SIM
Simulator
SL
Sea level
SND
Sound level
SP
spare: space
STA
Station
STBY
Standby
STD
Standard
STUD
Student
SW
Switch
SYS
System
T
TAC
Tactical
TDF
Todendorf AAF
THRML
Thermal
TOI
Troy
TOT
Time out-of-tolerance
TQ
Torque
TR
Turn rate
TRB
Turbulence
TRN
Trainer
TSD
Trainer status display
U
UHF
Ultra high frequency
UTL
Utility
V
VASI
Visual approach slope indicator
VFR
Visual flight regulations
VHF
Very high frequency
VIS
Visual: visibility
VMC
Visual meteorlogical conditions
VNE
Values not to exceed
VOR
Very high frequency omnidirectional range
VS
Vertical speed
Glossary 5
