Aviation Terms and Definitions

Spatial Disorientation Spatial disorientation is an erroneous sense or mistaken perception of one's position and motion relative to the earth. Deicing Is used after ice has built up to an appreciable amount. Typically this includes surface deice equipment. VASI Visual approach slope indicators provides visual descent guidance during the approach to a runway. The lights are arranged in bars and vary in number from two to 16. Steady red Stop or Give way to other aircraft and continue circling Runway Incursion Vestibular system Organs found in the inner ear that sense position by the way we're balanced. Autokinesis At night, a stationary dim light against a dark background will appear to move if a pilot visually fixates on the light for about six to 12 seconds. PAPIs Precision approach path indicators light units similar to the VASI but are installed in a single row of either two or four light units. DUAT Direct User Access Terminal system TCAS Traffic Alert and Collision Avoidance Systems Technology in the cockpit can help pilots to see and avoid other aircraft. All air carrier aircraft are equipped with Traffic Alert and Collision Avoidance Systems. Wing Stall The wing will ordinarily stall at a lower angle of attack, and thus a higher airspeed, when contaminated with ice. Even small amounts of ice will have an effect, and if the ice is rough, it can be a large effect.

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	Did You Know?
	National Transportation Safety Board ("NTSB") is a federal agency that investigates plane crashes They are charged with investigating every civil aviation accident in the United States. Its jurisdiction also includes trains and other vehicle accidents as well. The NTSB also issues safety recommendations aimed at preventing future accidents. The NTSB maintains the government's database on civil aviation accidents and conducts special studies of transportation safety issues of national significance.