I'm reading an old engineering book about aircraft Structures from the 1950s and I don't recognize the term inertia load. Can anyone give me a definition of it? I'm going to take a guess based on what i do know. Inertia is a body's resistance to change in speed and direction. So when some force were to try to make ti change speed or direction, there then exists some force of resistance in the body. And that force that resists change in speed and velocity is the inertia load. That's really my best guess since the terminology is unfamiliar to me and I have not seen it in any of high school level and intro physics textbook. The word inertia alone yes but not as inertia load. Those older textbooks are giving me a hard time with unfamiliar terminology, some of which seems outdated. I've searched for "inertia loads" in Google but I find it being discussed in some papers but can't get a definition for it.