safe obstruction clearance

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• Minimum safe altitude — Minimum safe altitude(MSA) is a concept used in planning and executing aircraft flights. It is an altitude which allows adequate vertical clearance from nearby terrain and manmade obstacles, and allows proper navigational functions. Contents 1… …   Wikipedia

• appropriate obstacle/terrain clearance altitude — A specified minimum published altitude that must be flown by an aircraft to ensure safe flight over an obstruction or specified terrain. These include minimum IFR (instrument flight rules) altitude (MIA), minimum en route altitude (MEA), minimum… …   Aviation dictionary

• visual approach slope indicator — A system of lights arranged to provide visual descent guidance information during the approach to a runway. These lights are visible from 3 to 5 miles during the day and up to 20 miles at night. The visual glide path of the VASI provides a safe… …   Aviation dictionary

• three-bar VASI — A system of lights arranged to provide visual descent guidance information during the approach to a runway. These lights are visible from 3 to 5 miles during the day and up to 20 miles or more at night. The visual glide path of the VASI provides… …   Aviation dictionary

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• International Regulations for Preventing Collisions at Sea — The International Regulations for Preventing Collisions at Sea 1972 (COLREGS) are published by the International Maritime Organization (IMO), and set out, inter alia, the rules of the road or navigation rules to be followed by ships and other… …   Wikipedia

• Glossary of cue sports terms — The following is a glossary of traditional English language terms used in the three overarching cue sports disciplines: carom (or carambole) billiards referring to the various carom games played on a billiard table without pockets; pool (pocket… …   Wikipedia

• United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …   Universalium

• Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations …   Wikipedia

• Dale Farm — Coordinates: 51°35′42″N 0°28′26″E / 51.595°N 0.474°E / 51.595; 0.474 …   Wikipedia

• United Nations — 1. an international organization, with headquarters in New York City, formed to promote international peace, security, and cooperation under the terms of the charter signed by 51 founding countries in San Francisco in 1945. Abbr.: UN Cf. General… …   Universalium