| | Title | Definition |
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| Sigmet | Warning signal issued by Aviation Meteorological Service when weather conditions suddenly deteriorate. |
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| Situational awareness | Scope of the term "situational awareness" is taken to include: - Spatial awareness in 3 dimensions, especially with regard to the airport and high ground - awareness of autopilot/flight director mode and understanding of its operation. - awareness of FMC "intentions" and their relevance to the desired outcome. |
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| Slats | Aerodynamic device fitted to leading edge of wings to delay onset of stall. |
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| Spot height | Height noted on chart showing elevation of prominent mountain peak. |
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| SSC | Side Stick Controller. Replaces a conventional flight yoke on Airbus aircraft. |
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| Stalling speed | Low airspeed at which aircraft wings suddenly lose lift. No connection with engine "stall". Is absolute minimum airspeed at which aircraft can maintain flight. |
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| Stick-shaker | Stall warning device which shakes aircraft's control columns as stalling speed is approached. |
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| Sub-system | An element of a system that, in itself, may constitute a system
A grouping of items satisfying a logical group of functions within a particular system [MIL-STD-882D]. |
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| System | A combination of components, parts, and elements which are inter-connected to perform one or more functions [AMC to 25.1309]
An integrated composite of people, products, and processes that provide a capability to satisfy a stated need or objective [MIL-STD-882D]. |
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| System Safety | The application of engineering and management principles, criteria, and techniques to achieve acceptable mishap risk, within the constraints of operational effectiveness and suitability, time, and cost, throughout all phases of the system life cycle [MIL-STD-882D].
A standardised management and engineering discipline that integrates the consideration of man, machine, and environment in planning, designing, testing, operating, procedures, and acquisition projects.
System Safety is the systematic process of the identification and resolution of hazards during the life cycle of an aircraft or airborne system. The resolutions of identified hazards are basically through three means:- The elimination (normally by design) of an identified hazard.
- The control of a hazard during testing or operational usage of an aircraft, or airborne system.
- The acceptance of a hazard without any elimination or control action where the hazard criticality and probability is sufficiently low to be able to accept the risk.
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| System Safety Analysis | The analysis of a complex system by means of methods, techniques, and/or processes, to comprehensively evaluate safety related risks that are associated with the system under study. |
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| System Safety Assessment | A structured body of evidence that provides a convincing and valid argument that a system is adequately safe for a given application in a given environment. It is a collection of documents that, taken together, provides objective evidence that a system, if used in accordance with the listed recommendations and limitations, can be certified as being |
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| System Safety Engineer | An engineer qualified by appropriate credentials: training, education, registration, certification, and / or experience to perform system safety engineering.
One should have an appropriate background and credentials directly related to system safety in order to practice in the field, i.e., CSP, PE, training, education, and actual experience. |
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| System Safety Engineering | An engineering discipline requiring specialised professional knowledge and skills in applying scientific and engineering principles, criteria, and techniques to identify and eliminate, or reduce safety related risks [refer MIL-STD-882D et al] |
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| System Safety Manager | A person responsible for managing a system safety program. |