This document establishes the mandatory minimum instrument flight rules (IFR) altitudes for civil aircraft operating within the United States national airspace system. The Government Printing Office provides this regulatory framework to ensure safe separation from terrain and obstacles during instrument meteorological conditions. It serves as the primary legal reference for pilots and dispatchers planning flight paths under IFR protocols.

Experts identify this text as a foundational regulatory document required for all instrument-rated pilots. Readers frequently note the technical density of the prose, as it is written as a formal legal code rather than an instructional manual.