How are dimensions shown on an aircraft drawing?

• A. By numbers shown in the break of the dimension line.
• B. By numbers placed along the dimension line ends.
• C. By letters placed near the dimension line.
• D. By the scale used for the drawing.

Answer: (A)

Dimensions are shown by the numeric value placed in the break of the dimension line. The dimension line runs between two extension lines from the features being measured, with arrowheads at the ends, and the actual distance is written in the break so the number sits clearly between the lines. This keeps the measurement directly tied to that specific span without cluttering the drawing or confusing other lines. Placing numbers at the ends or using letters nearby would not convey the measured size as clearly, and the drawing’s scale is about how the drawing size relates to the real size, not the value of the dimension itself.