Glossary of Terms

	Title	Definition
	Altitude	Height of aircraft as shown on altimeter adjusted to local barometric pressure.
	Analysis	Generally implies a more specific, more detailed investigation The terms "analysis" and "assessment" aach has a broad definition and the two terms are to some extent interchangeable. However, the term analysis generally implies a more specific, more detailed evaluation, while the term assessment may be a more general or broader evaluation but may include one or more types of analysis. In practice, the meaning comes from the specific application, e.g., fault tree analysis, Markov analysis, Preliminary System Safety Assessment, etc. [AMC to CS25.1309]
	Angle of attack (AoA)	Angle at which wings meet airflow.
	Annunciated	Warning or indication of failure is given to the flight crew in sufficient time to react to the failure [AMC to CS25.1309]
	Annunciation	Any form of visual or aural presentation designed to draw the attention of the flight or ground crew to an abnormal system operating condition [AMC to CS25.1309].
	APU	Auxiliary Power Unit.
	Artificial horizon (AH)	Instrument displaying aircraft attitude in relation to real horizon.
	ASEMS	Acquisition Safety and Environmental Management System [UK MoD0
	Assessment	An assessment is a more general, or broader, evaluation and may include one or more types of analysis. The terms "analysis" and "assessment" aach has a broad definition and the two terms are to some extent interchangeable. However, the term analysis generally implies a more specific, more detailed evaluation, while the term assessment may be a more general or broader evaluation but may include one or more types of analysis. In practice, the meaning comes from the specific application, e.g., fault tree analysis, Markov analysis, Preliminary System Safety Assessment, etc [AMC to CS25.1309]
	Asymmetric flight	Multi engined aircraft flying with one engine inoperative.
	ATIS	Automated terminal information service. Continuous, recorded radio transmission of meteorological conditions at airport.
	ATS	Air Traffic Services
	Attitude	Lateral and longitudinal relationship of aircraft to horizon.
	Attitude indicator	See Artificial Horizon and Flight Director.
	Average Probability per flight hour	A representation of the number of times the subject Failure Condition is predicted to occur during the entire operating life of all aeroplanes of the type divided by the anticipated total operating hours of all aeroplanes of that type [AMC to CS25.1309] (Note: The Average Probability Per Flight Hour is normally calculated as the probability of a Failure Condition occurring during a typical flight of mean duration divided by that mean duration).

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