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The outside air
temperature (OAT) gauge is a simple and effective
device mounted so that the sensing element is
exposed to the outside air. The sensing element
consists of a bimetallic-type thermometer in
which two dissimilar materials are welded together
in a single strip and twisted into a helix.
One end is anchored into protective tube and
the other end is affixed to the pointer, which
reads against the calibration on a circular
face. OAT gauges are calibrated in degrees °C,
°F, or both. An accurate air temperature
provides the pilot with useful information about
temperature lapse rate with altitude change.
(page 8-28)
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