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APPENDIX I - GLOSSARY - Continued
APPENDIX II - REFERENCES USED TO DEVELOP THIS NONRESIDENT TRAINING COURSE

Air Traffic Controller
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Terminal Controller Workstation (TCW)/Tower Display Workstation (TDW) ­
Displays RADAR data that has been collected by RADAR sensors and processed by
the RADAR Data Processor.
Threshold lights ­ Help approaching aircraft positively identify the beginning of the
operational runway surface at night or during periods of reduced visibility.
Traffic Alert and Collision Avoidance System (TCAS) ­ Airborne collision avoidance
system based on RADAR beacon signals that operates independent of ground-based
equipment.
True Bearing (TB) ­ The relation of an object to the aircraft using true north as the
reference point instead of the aircraft s position.
True Heading (TH) ­ The angle that is expressed with relation to true north.
Variation ­ The angle between magnetic north and true north.
Video Information Distribution System (VIDS) ­ Designed to consolidate, replace,
and automate several ATC systems.
Visual Approach Slope Indicator (VASI) ­ Provides visual descent guidance
information during the approach to a runway.
Warm front ­ Occurs when cold air retreats before an advancing mass of warm air.
Warning area ­ Airspace that contains hazards to nonparticipating aircraft and have
clearly defined dimensions extending 3 miles outward from a coastline.
Wavelength ­ Distance between corresponding points on consecutive waves, or the
distance a wave travels during one cycle.
Wheels-up lights ­ Bar of lights located in the approach area that illuminate the
underside of aircraft preparing for landing.
AI-6






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