Definition
The protected airspace surrounding a published Special Use Airspace (such as a Restricted Area, Warning Area, or Military Operations Area) that absorbs navigational and operational tolerances, ensuring activities inside the Special Use Airspace remain contained and do not affect aircraft operating just outside its charted boundaries.
Plain English
An invisible safety margin around special-use airspace. It gives a cushion so that whatever is happening inside (military training, hazardous activity, etc.) stays inside, and aircraft flying nearby aren't accidentally affected.
Context Anchor
Seen in ATC and IFR altitude planning, especially in discussions of minimum safe altitudes used when controllers guide aircraft by radar.
Derivation
The word 'buffer' comes from the old English 'buff,' meaning to absorb a blow or shock. A buffer area absorbs the small navigational errors and operational spillover from the airspace it surrounds.
Why Pilots Care
It ensures that even with allowable navigation inaccuracies, the aircraft maintains safe separation from terrain and obstacles.
Analogy
Think of it like drawing a safety circle around a construction hole. You do not plan your path right along the edge; you leave a cushion so small errors do not put you in danger.
Intuition Check
Do not read Buffer Area as just any open or unused area. In this FAA context, it means a specific protected safety zone around an obstacle.
Example Sentence 1
The controller vectored us slightly wide of the MOA boundary, using the buffer area to ensure separation from the military traffic operating inside.
Example Sentence 2
Buffer areas are wider in areas with higher terrain to maintain the required safety margins.