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Terms for subject Aviation (1801 entries)

secondary surveillance radar	A radar system that requires complementary aircraft equipment (transponder) The transponder generates a coded reply signal in response to transmissions from the ground station (interrogator) Since this system relies on transponder-generated signals rather than signals reflected from the aircraft, as in primary surveillance radar, it offers significant operational advantages such as increased range and positive identification.
flight application	section giving criteria of flights to which the fares apply	4uzhoj
sectional chart	An aeronautical chart (using a scale of 1:500 000) designed for visual navigation of slow- or medium- speed aircraft. Topographic information on these charts features the portrayal of relief and a judicious selection of visual checkpoints for VFR flight. Aeronautical information includes visual and radio aids to navigation, airports, controlled airspace, restricted areas, obstacles, and related data.
sector	A part of an ATC unit that has a designated area of responsibility (AOR) in which ATS are provided
see and avoid	An expression relating to a concept whereby pilots of aircraft flying in visual meteorological conditions (VMC) regardless of the type of flight plan (FP) are responsible for observing the presence of other aircraft, terrain and obstacles and of manoeuvring their aircraft as required to avoid these objects
selective calling system	A system that provides an automatic and selective method of calling any aircraft. Voice calling is replaced by the transmission of code tones to the aircraft over the international radiotelephony channels. This system is installed on all international frequencies at Canadian stations.
separation	The spacing between aircraft, altitudes, or tracks
separation minimum	The least allowable amount of lateral, longitudinal, or vertical separation to be applied
sequential attack	Swapping of roles of engaged and supportive fighters as one or the other comes into a more favorable position to achieve a kill
severe icing	An atmospheric condition in which the rate of ice accumulation is such that de-icing or anti-icing equipment cannot reduce or control the hazard. " see also: trace icing, light icing and moderate icing
severe turbulence	Turbulence that causes large, abrupt changes in altitude or attitude. It usually causes large variations in indicated airspeed (IAS) Aircraft may be momentarily out of control.
severe weather forecast alert	Preliminary messages issued in order to alert users that a severe weather watch bulletin (WW) is being issued. These messages define areas of possible severe thunderstorms or tornado activity.
shallow water	shallow water equation	bonly
shallow water	shallow water equation	bonly
Shanwick	oceanic area control center	4uzhoj
sharped charge	An explosive device designed to penetrate armor, concrete or other defensive shields
Shilka	ZSU-23-4 mobile AAA battery
shock wave	A region of abrupt change in pressure and density moving ahead of the aircraft as a wave front at or above the speed of sound
short takeoff and landing aircraft	An aircraft that, at some weight within its approved operating weight, is capable of operating from a STOL runway in compliance with the applicable STOL characteristics and airworthiness, operations, noise, and pollution standards
STOVL	short takeoff and vertical landing	'More