Semicircular / semi s% kjυlə / adjective in the shape of half a circle Most mathematical protractors are semicircular in shape. Semicircle / semi s% k ( ə ) l / noun half a circle Most mathematical protractors are made of plastic in the shape of a semicircle. Also called centre fix semi- / semi / prefix half self pəz ʃ ( ə ) n ŋ / noun the positioning of the aircraft on the extended centreline of the runway using the on-board navigation system. self-contained / self kən te nd / adjective independent The auxiliary power unit is a self-contained unit. The purpose of this selector is to direct fluid to the appropriate side of an actuator. Selector / s lektə / noun a manually operated device like a switch, which offers a choice of settings Turn the selector control. a collection of carefully chosen things a selection of photographs a choice of something such as a particular instrument or system setting By manual selection of the heating switch, the formed ice can be dispersed. Sure controller is used to select cabin altitude. Select / s lekt / verb to choose something such as a particular instrument or system setting A reverse thrust lever in the crew compartment is used to select reverse thrust. The wet sump system of lubrication is seldom used on modern aircraft. Seldom / seldəm / adverb not often, rarely Aircraft are seldom hit by lightning. SELCAL noun a high-frequency radio system which alerts the crew of an aircraft to the fact that air traffic control is trying to contact them.

people whose job is to protect buildings or other people against crime verb to attach firmly, to fasten or to make safe If the onset of turbulence is sudden, crew must immediately secure themselves in the nearest available seats.Ģ. Secure / s kjυə / adjective fastened or locked, safe Overhead baggage lockers must be secure. a segment of airspace with its own team of air traffic controllers the portion of a circle inside two radii and the included arc 3. On some sectors, because of fuel costs at the destination, it can be economical to carry excess fuel. part of the flight between an aircraft moving under its own power until it next stops after landing in its allocated parking position showing a solid object as it would appear if it were cut referring to a section or composed of sections 2.

Sectional / sekʃən ( ə ) l / adjective 1.

a diagram of a solid object as it would appear if cut, so that the internal structure is displayed. part of a text The book is divided into four sections, and the first four chapters form the first section. a component or part of a structure tail section and nose section of the aircraft the non-smoking section of the aircraft 2. Secondary surveillance radar (SSR) is normally used to supplement data from primary systems. Identify aircraft, determine altitude and range, etc.

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