letdown

letdown
The procedure adopted commencing from the top of the descent at the end of cruising through the approach for landing. It does not include the terminal part of the final approach. The various types of letdown are the NDB (nondirection beacon) let-down, radar letdown, en route descent, pipeline descent, QGH, etc. The procedure for letdown is given in the instrument approach charts. The illustration indicates a high-altitude letdown procedure by combat aircraft using a radio compass or a direction finder. See also instrument approach chart.
Typical high altitude controlled descent (QGH/NDB) let down pattern for a combat aircraft

Aviation dictionary. 2014.

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