I think the other statute is somewhat more relevant, because I'm not sure this is "assaulting or intimidating a flight crew member or flight attendant" (as it's more targeted against infrastructure than people!). I agree with the thought that a public address system is a "part" of an aircraft whose reduction in serviceability "is likely to endanger the safety".

You might argue that flight crew could be intimidated by the knowledge that their aircraft is behaving unusually, but I don't think that's particular core territory of "assaulting or intimidating".