347 abbreviations
Abbreviation Meaning
TORA take-off run available
TOW take-off weight
TOWS take-off warning system
TP turning point at missed approach
TRA temporary reserved airspace
TRACON terminal radar approach control
TTAF total time air frame
TTSN total time since new
TTSO total time since overhaul
TWR tower
TWY taxiway
UAV unmanned air vehicle
UHF ultra-high frequency
UIR upper information region
UTC Universal Coordinated Time
Va maneuvering speed
VASI visual approach slope indicator
VDP Visual descent point
Vfe maximum flaps extended speed
VFR visual flight rules
VHF very high frequency
Vle maximum landing gear extension sp
Vlo maximum landing gear operating speed
VMC visual meteorological conditions
Vmc minimum control speed
Vmo maximum operating speed
VNAV vertical navigation
Vne never-exceed speed
Vno normal operating speed limit
VOR VHF omnidirectional range
Vs stall speed
Vso stall speed in landing configuration
VVI Vertical velocity indicator (the same as VSI)
Vx best angle of climb speed
Vy best rate of climb speed
WAT weight, altitude, temperature: variables that affect takeoff performance
WEF with effect from
WOFW weight-off-wheels, indicates aircraft is off ground since lift off
WONW weight-on-wheels, indicates aircraft is on ground since touch down
XMIT transmit
XPDR transponder
XPNDR transponder
Y yaw or yaw angle
Y/D yaw damper
Z Zulu Time (UTC)
ZFT zero-fuel time
ZFW zero-fuel weight