letdown


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letdown

[′let‚dau̇n]
(aerospace engineering)
Gradual and orderly reduction in altitude, particularly in preparation for landing.

letdown

letdownclick for a larger image
Typical high altitude controlled descent (QGH/NDB) let down pattern for a combat aircraft
letdownclick for a larger image
A point that lies at 83 degrees 42 minutes North and 14 degrees 30 minutes East may be expressed in lettered coordinates as TSMA 4230.
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) letdown, 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.
References in periodicals archive ?
Creators and writers Sarah Scheller and Alison Bell, said "We are thrilled to be working with the ABC and Netflix on a full series of The Letdown.
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Lucidene[TM] 645 - acrylic-urethane letdown vehicle.
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It also is possible to ruin a dispersion in the letdown process.
OmniColor coloranrs are based on a multipurpose, widely compatible carrier system for use in a wide range of plastics at an average letdown ratio This is four times higher letdown than the 25:1 ratio typical for other colorants.
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A color selection guide for silicone contains color chips of 24 single-pigment base colors or masstones, each shown full-strength and as a 10% letdown in a white silicone dispersion and 12" standard color blends comprised of two or more masstone colors.