How often are enroute charts revised?

• A. every 28 days
• B. every 90 days
• C. every 56 days
• D. every 120 days

Answer: (C)

Enroute charts follow a fixed revision schedule to keep navigation information current for IFR flight planning. The standard cycle for enroute charts is every 56 days, about eight weeks. This cadence lets the charting office incorporate changes to airways, navaids, altitudes, and airspace in a timely, manageable way without making updates too frequent. It also aligns with production and distribution workflows so pilots can rely on a steady update rhythm. While digital systems can push updates as needed, the established enroute chart revision interval remains 56 days.