Definition
A block of airspace, designated by regulation, within which the flight of aircraft is forbidden. Prohibited Areas are established for reasons of national security or other essential interest, and are depicted on aeronautical charts with defined lateral and vertical limits.
Plain English
A piece of airspace you are not allowed to fly into at all. Entry is forbidden by regulation, not just discouraged.
Context Anchor
Seen on aeronautical charts and during route planning, especially near places protected for security or national welfare.
Derivation
“Prohibited” comes from a Latin word meaning “to hold back” or “to prevent.” That fits the aviation meaning: this is airspace where aircraft are held back from entering unless authorized.
Why Pilots Care
Unauthorized entry can trigger immediate military intercept, FAA enforcement action, and certificate suspension.
Analogy
Think of it like a locked room in a building. It is not just a place where visitors are discouraged; it is a place you do not enter unless someone with authority lets you in.
Intuition Check
Do not treat “prohibited” as just a warning or recommendation. In this term, it means flight in that airspace is not allowed without specific authorization.
Example Sentence 1
While planning the cross-country, the student noticed a Prohibited Area along the direct route and adjusted the course to give it a wide berth.
Example Sentence 2
When an engine failure forced a diversion, the pilot declared an emergency and received ATC clearance through the edge of a prohibited area.