What designation do MTRs that are flown at 1,500 ft. AGL and below have?

MTRs, or Military Training Routes, are designated routes established by the military to allow for high-speed, low-altitude training flights. The designation system categorizes MTRs based on their operational altitudes.

MTRs that are flown at 1,500 feet Above Ground Level (AGL) and below are assigned Designation Numbers 4. This specific designation signifies that the route is primarily utilized for training purposes where aircraft can operate closely to the terrain, which is critical for training pilots in tactical and low-level flight techniques.

Routes with different designation numbers serve varying purposes and altitude ranges. For instance, Designation Numbers 1 are typically for routes flown above 1,500 feet AGL and are less focused on low-altitude training. Thus, understanding the designation system helps in recognizing the operational environments and intended uses of these routes, ensuring safe and effective military training while avoiding conflicts with civilian air traffic.