Final answer:
Engineering principles apply to all aircraft and weapons systems, their subsystems, equipment, components, related SE, special tools, fluids, and materials used in operating the equipment.
Step-by-step explanation:
All aircraft and weapons systems, their subsystems, equipment, components, related SE, special tools, fluids, and materials used in operating the equipment are governed by engineering principles. Engineering principles are the scientific and mathematical principles used in the design and operation of various systems. For example, when designing an aircraft, engineers use principles of aerodynamics and fluid dynamics to ensure optimal performance and safety. These principles also apply to the design and operation of weapons systems and other equipment.