Which ENR sections correspond to FIR boundary details and upper airspace structure, respectively?

Which ENR sections correspond to FIR boundary details and upper airspace structure, respectively?

• A. ENR 2.1 and ENR 2.2
• B. ENR 2.2 and ENR 2.1
• C. ENR 3.1 and ENR 2.1
• D. GEN 1.1 and ENR 2.1

Answer: (A)

In En Route Navigation, the information is split to help you quickly find how airspace is defined and organized. The FIR boundary details are given in the first En Route subsection, where you’ll find the exact limits of each Flight Information Region and how routes cross those borders. The upper airspace structure is covered in the next subsection, which lays out how the higher levels of airspace are arranged—upper control areas and the network of upper ATS routes. So, FIR boundary details belong to the first En Route subsection, and upper airspace structure belongs to the second. That’s why the pairing FIR boundary details with upper airspace structure matches ENR 2.1 and ENR 2.2.

In En Route Navigation, the information is split to help you quickly find how airspace is defined and organized. The FIR boundary details are given in the first En Route subsection, where you’ll find the exact limits of each Flight Information Region and how routes cross those borders. The upper airspace structure is covered in the next subsection, which lays out how the higher levels of airspace are arranged—upper control areas and the network of upper ATS routes.

So, FIR boundary details belong to the first En Route subsection, and upper airspace structure belongs to the second. That’s why the pairing FIR boundary details with upper airspace structure matches ENR 2.1 and ENR 2.2.