Definition
Controlled airspace designated as Class E that begins at the surface of the earth and extends upward to a designated altitude or to the overlying or adjacent controlled airspace. A CESA is established to provide controlled airspace down to the ground at airports that need instrument approach protection but do not have an operating control tower (or where Class B, C, or D does not apply).
Plain English
A pocket of controlled airspace that reaches all the way down to the ground around certain non-towered airports, so that aircraft flying instrument approaches there are protected from the ground up.
Context Anchor
Pilots may see CESA in FAA abbreviations, NOTAMs, chart discussions, and airspace descriptions. On many sectional charts, a Class E surface area is shown with a dashed magenta boundary.
Why Pilots Care
It sets the exact visibility and distance-from-cloud requirements for VFR flight and indicates when an IFR clearance is mandatory.
Grounding Statement
Think of it as Class E airspace that comes all the way down to the airport surface instead of starting higher above the ground.
Intuition Check
“Surface area” does not mean the airport’s pavement or land area. Here it means an area of airspace whose lower edge starts at the ground.
Example Sentence 1
Because the airport has a published instrument approach but no control tower, it’s surrounded by a Class E surface area shown by a dashed magenta line on the sectional.
Example Sentence 2
Inside the CESA the student maintained three miles visibility and stayed clear of clouds as required for VFR operations.