Which enroute low altitude navigation chart would cover proposed IFR routing departing from Billings Logan Intl. (BIL)?

The enroute low altitude navigation chart that would cover proposed IFR routing departing from Billings Logan International (BIL) is indeed the L-13D chart. This chart is specifically designed for use in low altitude IFR navigation and includes information relevant to pilots flying at altitudes below 24,000 feet. It encompasses various navigational aids, waypoints, and airways, which are essential for planning and safely executing IFR flights.

In this case, the L-13D chart would provide the necessary data for routes that originate from Billings, including air traffic control procedures, communication frequencies, and any available navigational aids in that area. This makes it the most suitable option for a pilot intending to navigate on an IFR flight plan from Billings Logan International.

While the H-1E chart serves a different purpose, covering specific Helicopter routes, it does not provide the comprehensive low altitude IFR routing information needed for departure from a major airport like Billings. The Billings Sectional Chart, while useful for visual flight rules and general navigation in the vicinity of the airport, identifies more local features and does not offer the detailed intra-airspace information necessary for IFR operations. Thus, for departing on an IFR route from Billings, the L-13