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Aviation Institute Of Maintenance (AIM) Block 1 Practice Test

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Which term describes vertical cross-sections used on the side of the fuselage in weight and balance?
Correct Answer:
Buttock lines
Explanation:
Vertical cross-sections used on the side of the fuselage in weight and balance are buttock lines. These lines run up and down along the aircraft’s side view and define the vertical slices used to describe how weight is distributed in the fuselage in the vertical plane. When you calculate moments and CG, buttock lines help show where a load acts relative to the datum by providing those vertical cross-sections to reference height and placement. This is different from water lines, which are horizontal cross-sections used to describe vertical position, and from fuselage stations and datum, which are a longitudinal location and a fixed reference point, respectively.

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