AIRCRAFT WEIGHT AND BALANCE

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Last updated 5:30 AM on 7/12/26
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11 Terms

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Basic Empty Weight (BEW)

Airframe, engines, fixed equipment, full operating fluids (oil, hydraulic), and unusable fuel.

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Useful Load

Weight of crew, cargo, passengers, baggage, and usable fuel.

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Zero Fuel Weight

Operational weight with payload but without fuel load.

4
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Ramp Weight

Weight of the airplane loaded for flight before engine start (includes taxi fuel).

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Take-off Weight

Weight just before brake release to begin the takeoff roll.

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Arm

Horizontal distance from the reference datum line to the center of gravity of an item.

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Moment

Product of the weight of an object multiplied by its arm.

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Moment Index

Moment divided by a constant (100, 1000, 10000) to simplify calculations.

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Fuselage Station

Reference line along the x-axis (longitudinal) of the aircraft.

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Buttock Line

Reference line along the y-axis (lateral) of the aircraft.

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Water Line

Reference line along the z-axis (vertical) of the aircraft.