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Continuous descent approach
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Continuous descent approach : ウィキペディア英語版
Continuous descent approach

Continuous Descent Approach (CDA) also known as Optimized Profile Descent (OPD), this is a method by which aircraft approach airports prior to landing. It is designed to reduce fuel consumption and noise compared to other conventional descents. Instead of approaching an airport in a stairstep fashion, throttling down and requesting permission to descend to each new (lower) altitude, CDA allows for a smooth, constant-angle descent to landing.
A continuous descent approach starts from the top of descent, i.e. at cruise altitude, and allows the aircraft flying its individual optimal vertical profile down to runway threshold. Some airports apply constraints to this individual optimal profile.
==United Kingdom==
The approach to London Heathrow Airport uses CDA, particularly at night to minimize noise pollution.

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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