Tolerances are commitments
Each callout names the allowable drift before crew, fuel, and structure lose margin.
Load path doctrine
Every Line Carries Mass
Views disagree until proven
Plan, elevation, and section are checked as separate witnesses to the same machine.
Mass travels through joints
Frames, rings, and weld lands carry launch loads before any instrument records them.
The drawing remains flight law
Release marks, revision blocks, and red zones decide what enters the assembly bay.