Aviation Machinist Mate (AD) Week 1 Practice Test

Geometric tolerance controls how a feature’s geometry may vary from its intended shape and how that feature is positioned relative to the part as a whole. It covers four main aspects: shape (form), orientation, runout, and location. Shape includes how straight, flat, or circular a feature should be. Orientation governs how features are angled or aligned relative to datum directions (for example, perpendicularity or parallelism). Runout describes how much a surface or feature can deviate as the part rotates. Location deals with the feature’s placement in relation to datums, often captured by true position or related controls.

That combination—shape, orientation, runout, and location—is exactly what geometric tolerancing addresses on a drawing, making it clear how the part must be formed and situated for proper fit and function. Size is controlled by dimensional limits, not by geometric tolerances alone; material type and weight aren’t specified by geometric tolerances; surface finish and color are either separate attributes or not the primary scope of GD&T, with color not related to geometric control in this context.