What does a CMA boundary sign indicate?

What does a CMA boundary sign indicate?

• A. Indicates the end of ATC authority boundary.
• B. Marks boundary where airfield ATC authority begins; entry requires clearance.
• C. Shows the recommended speed limit on taxiways.
• D. Denotes a no-entry zone for all vehicles.

Answer: (B)

The main idea is recognizing where ATC control begins on the airfield. A CMA boundary sign marks the point where the movement area—the part of the airfield under ATC supervision—starts. Once you see it, you’re at the edge of the ATC-controlled area, and entering requires explicit clearance from ATC before you proceed. That’s why this sign is best described as indicating the boundary where airfield ATC authority begins and that entry requires clearance. It isn’t indicating the end of ATC authority, a speed limit on taxiways, or a no-entry zone for all vehicles—the key function is identifying the start of ATC-controlled airfield movement area and the need for clearance to enter.

The main idea is recognizing where ATC control begins on the airfield. A CMA boundary sign marks the point where the movement area—the part of the airfield under ATC supervision—starts. Once you see it, you’re at the edge of the ATC-controlled area, and entering requires explicit clearance from ATC before you proceed.

That’s why this sign is best described as indicating the boundary where airfield ATC authority begins and that entry requires clearance. It isn’t indicating the end of ATC authority, a speed limit on taxiways, or a no-entry zone for all vehicles—the key function is identifying the start of ATC-controlled airfield movement area and the need for clearance to enter.