DRYTRA level

DRYTRA level: A level of temperatures at which exhaust trails must occur even if the ambient air is completely dry. This flight level is determined with the help of a chart called a tephigram. A tephigram is an aerological map on which temperatures and potential temperatures are marked along x and y axes, respectively and are used to ascertain the stability of atmosphere. The chart is prepared by a meteorologist. DRYTRA is expressed as flight level. See also tephigram.

Dry bulb thermometer.

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MINTRA/mintra level — The flight level below which exhaust trails will positively not form. They may or may not form above the MINTRA level. This flight level is obtained from a tephigram drawn by the meteorologist. DRYTRA is the level above which exhaust trails will… … Aviation dictionary
tephigram — An aerological map on which temperatures and potential temperatures (pot temp) are marked along the X and Y axes, respectively. Tephigrams are used to ascertain the stability of the atmosphere. Information about the MINTRA level i.e., the minimum … Aviation dictionary

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