Which document defines holding pattern altitudes?

Which document defines holding pattern altitudes?

• A. ENR 3.6
• B. ENR 2.6
• C. ENR 4.6
• D. ENR 5.6

Answer: (A)

Holding pattern altitudes are published in the en-route information of the Aeronautical Information Publication (AIP). In this publication, the ENR section contains procedures related to en-route operations, and the subsection specifically for holding patterns and their altitudes is ENR 3.6. This is the source pilots use to know the altitude to maintain when flying a published hold at a given fix or waypoint, unless ATC assigns a different altitude. The other ENR subsections cover different en-route topics and do not define holding pattern altitudes, so ENR 3.6 is the correct reference.

Holding pattern altitudes are published in the en-route information of the Aeronautical Information Publication (AIP). In this publication, the ENR section contains procedures related to en-route operations, and the subsection specifically for holding patterns and their altitudes is ENR 3.6. This is the source pilots use to know the altitude to maintain when flying a published hold at a given fix or waypoint, unless ATC assigns a different altitude. The other ENR subsections cover different en-route topics and do not define holding pattern altitudes, so ENR 3.6 is the correct reference.