the Aviation Dictionary

utility category airplane . U-tube manometer
includes those derived from database-driven area
navigation (RNAV) systems whereby
latitudellongitude coordinate-based waypoints are
generated by various means including keyboard input,
and even electronic map mode functions used to
establish waypoints with a cursor on the display.
Another example is an offset phantom waypoint, which
is a point in space formed by a bearing and distance
from navaids such as VORs, VORTACs, and
TACANs, using a variety of navigation systems.
utility category airplane - An airplane certificated for
flight that includes limited acrobatics such as spins,
lazy eights, chandelles, and steep turns in which the
bank angle exceeds 60".
utility finish - A finish used on aircraft that provides the
fabric with the necessary fill and tautness, but lacks the
glossy appearance of a showroom finish.
U-tube manometer - A "U"-shaped glass tube filled
with a liquid. Pressure is measured by connecting a gas
under pressure to one vertical of the manometer. The
pressure causes a differential between the levels in the
two verticals. This gives a differential pressure
between the gas pressure and atmospheric pressure. If
the liquid is water, the measurement is in water column
inches (WCI).
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