Wing and fuselage structural components, the aerodynamic, inertial, and ground loads an airframe carries, and why semi-monocoque construction, not pure monocoque, dominates modern aircraft.
Every load Modules 2 and 3 quantified — lift, drag, and the pressures compressible flow imposes at high speed — ultimately has to be carried by a physical structure back to the airframe's center of mass or the ground. This module covers that structure's named anatomy: spars, ribs, and skin in the wing; skin, stringers, and frames in the fuselage; the aerodynamic, inertial, and ground load types an airframe experiences; and why nearly every modern wing and fuselage uses semi-monocoque construction rather than a pure monocoque shell.
By the end of this module you should be able to explain why a pressurized airliner fuselage is designed primarily against fatigue rather than static strength, and why semi-monocoque construction's redundant load paths are close to a certification necessity for an airframe expected to fly for decades — the damage-tolerance foundation Module 12's materials content and Module 15's flight-testing content each build on.