Glossary - W

Waterline (WL).   A horizontal reference plane used to locate vertical positions on an aircraft. Positions are usually given in inches above or below the waterline.

Watt.   A unit of power equal to one joule per second.

Weighing points.   Locations on an aircraft that the manufacturer designates for the placement of scales when weighing aircraft.

Weight.   A measure of the pull of gravity acting on the mass of an object.

Whole numbers.   The numbers: 0, 1, 2, 3, 4, 5, and so on.

Wiring diagrams.   A diagram that shows the electrical wiring and circuitry, coded for identification, of all the electrical appliances and devices used on aircraft.

Work.   The amount of energy transferred by a force.

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