The ACA is a three-dimensional block of airspace established by which authority?

The ACA is a three-dimensional block of airspace established by which authority?

• A. Coordinating Altitude (CA)
• B. Coordination Level (CL)
• C. Airspace Coordination Area (ACA)
• D. Pulse Repetition Interval (PRI)

Answer: (C)

The thing being tested is that certain portions of airspace are defined as Airspace Coordination Areas, which are three‑dimensional blocks established by the coordinating authority responsible for airspace management in that region. The term ACA itself denotes this defined block used for coordinating traffic, so the correct choice is the one that names the area itself. The other terms refer to coordination concepts or radar parameters, not to a defined airspace block.

The thing being tested is that certain portions of airspace are defined as Airspace Coordination Areas, which are three‑dimensional blocks established by the coordinating authority responsible for airspace management in that region. The term ACA itself denotes this defined block used for coordinating traffic, so the correct choice is the one that names the area itself. The other terms refer to coordination concepts or radar parameters, not to a defined airspace block.