Structure, controls and landing gear
Aircraft general knowledge connects a component’s construction with the load or function it serves. A fuselage, wing and landing gear form interacting load paths. In semi-monocoque construction, skin, frames and longitudinal members contribute together; describing the skin as irrelevant or treating every load as a pure tensile force misses that interaction. Bending, shear and torsion are different stress conditions. A wing spar and stressed skin therefore cannot be identified solely by their visible shape.
Fatigue and design philosophy
Repeated loading matters as well as a single large load. Pressurization and flight-load cycles contribute to fatigue, with severity and inspection assumptions important to the actual approved design. A fail-safe concept provides alternative load paths after a specified failure. Damage tolerance considers the presence and growth of damage and the inspections needed to detect it before a critical condition. These ideas are related but are not identical to an unlimited promise that an aircraft can tolerate every crack.
Controls and feedback
Ailerons, elevator and rudder control the conventional roll, pitch and yaw axes. High-lift devices and spoilers change lift and drag for their intended functions. A trim tab reduces the force required to maintain a condition; an anti-servo tab can increase feel on a stabilator. Mass balance concerns inertial effects and flutter susceptibility, while aerodynamic balance affects hinge moments. Do not identify one kind of balance merely because both make a control easier or safer to use.
Fly-by-wire describes electrical signaling and control computation, not one identical protection law fitted to every aircraft. The actual control mode, available sensors and aircraft configuration determine what functions remain. A warning, a command and the actual surface position are different information states. A computed command does not prove an actuator moved or that every protection is available.
Landing gear and brakes
A shock strut combines gas compression with fluid metering to cushion loads. A shimmy damper addresses unwanted nose-wheel oscillation. Anti-skid modulates braking in response to wheel behavior; it is not permission to exceed a runway or brake-energy limit. Fusible plugs can relieve an overheated wheel’s pressure through their designed action. Gear sequencing, emergency extension and indication logic depend on the aircraft. Study their purpose and the stated diagram rather than prescribe a universal cycling or breaker-reset procedure.
This bank teaches system recognition and reasoning, not maintenance release or flight-specific procedures. Use the applicable aircraft documentation for actual limitations, inspections, operation and abnormal actions.