Panels from the Headline Hunter story "The Engine of Destruction" in Captain America Comics #6 (Marvel/Timely, September 1941), script by Stan Lee, pencils and inks by Jack Binder (?)
Why, of course he crashes a plane into it. That certainly won't hurt anyone or anything at all near the densely populated Parliament Square, I betcha.
Good thing HH bailed out that suicide plane and landed three miles away across the Thames. Still: advantage, Headline Hunter.