Flight, Measurements Of
Piloting an aircraft requires constant scanning and verifying of measurements. Pilots develop a sense of reasonable measurements for routine situations. For non-routine situations, pilots practice in simulators so they can quickly make sense of the measurements they see on the aircraft's instrument panel. When necessary, they can make rapid decisions to correct for unanticipated conditions. The U.S. customary system of measurement is used, because that is the system used by most pilots in the United States and worldwide.
Level Flight
On an aircraft, a propeller or jet engine provides thrust, which moves the plane forward through the air. Thrust acts parallel to the direction of flight. The weight of the aircraft is the force of gravity acting toward the center of Earth. The aerodynamic forces of lift and drag result from air pressure. Lift, the vertical component, acts to oppose gravity. Drag acts opposite to the flight path of the aircraft.
An aircraft in level flight must be in a condition of equilibrium, meaning the forces (vector quantities) acting upon the aircraft (thrust, drag, weight, and lift) are in balance. To be in balance, lift must equal weight and engine thrust (power) must equal drag.
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