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Final approach (aeronautics)
A final approach (also called final leg and final approach leg) is the last leg in an aircraft's approach to landing, when the aircraft is lined up with the runway and descending for landing.〔Crane, Dale: ''Dictionary of Aeronautical Terms, third edition'', page 213 and 241. Aviation Supplies & Academics, 1997. ISBN 1-56027-287-2〕 In aviation radio terminology, it is often shortened to "final".
In a standard airport landing pattern, which is usually used under visual meteorological conditions (VMC), aircraft turn from base leg to final within one-half to two miles of the airport. For instrument approaches, as well as approaches into a controlled airfield under visual flight rules (VFR), often a "straight-in" final approach is used, where all the other legs are dispensed with. Straight-in approaches are discouraged at non-towered airports in the US.〔(【引用サイトリンク】publisher=AOPA )〕
==Approach slope==
An approach slope is the path that an airplane follows on its final approach to land on a runway. It takes its name from the fact that this path is ideally a gentle downward slope. A commonly used approach slope is 3° from the horizontal. However, certain airports have steeper approach paths based on topography, buildings, or other considerations. E.g., London City Airport has a 5.5° approach, and only aircraft that can maintain such an approach are permitted to use the airport.
The term glide slope is often applied to mean approach slope although to be correct glide slope applies to the vertical guidance element of the Instrument Landing System.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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