TCH--Threshold Crossing Height
TERPS--Terminal Instrument Procedures
TOE--Tables of Organization and Equipment
TVOR--Terminal Very High Frequency Omnidirectional
USAASA--US Army Aeronautical Services Agency
USAATCA--US Army Air Traffic Control Activity
USAF--United States Air Force
USASC--US Army Safety Center
VASI--Visual Approach Slope Indicator
VIP--Very Important Person
VFR--Visual Flight Rules
VMC--Visual Meteorological Conditions
VOR--Very High Frequency Omnidirectional
VORTAC--Very High Frequency Omnidirectional
and Tactical Air Navigation
VSTOL--Vertical Short Takeoff and Landing
VTOL--Vertical Takeoff and Landing
WGS84--World Geodetic System 1984
Aborted Takeoff--An unsuccessful takeoff operation due to power or other mechanical failures.
Accident Potential Zone I (APZ I)--The area beyond the clear zone that possesses a significant
potential for accidents.
Accident Potential Zone II (APZ II)--The area beyond APZ I that has a measurable potential for
AICUZ (Air Installation Compatible Use Zone)--A DoD program designed to promote compatible
development around military airfields and to protect the integrity of the installation's flying mission.
Air Traffic--Aircraft in operation anywhere in the airspace and within that area of an airfield or airport
normally used for the movement of aircraft.
Aircraft--Fixed-wing (F/W) (Airplane) and rotary-wing (R/W) (helicopter).
Aircraft, Class A--Aircraft listed under Class A Runways in Table 3.1 of this manual.
Aircraft, Class B--Aircraft listed under Class B Runways in Table 3.1 of this manual.
Aircraft Arresting Barrier--A device, not dependent on an aircraft hook, used to engage and absorb
the forward momentum of an emergency landing or an aborted takeoff.