What does MEA stand for in aviation?

In aviation, MEA stands for Minimum En Route Altitude. This term refers to the lowest altitude that can be flown on an instrument flight plan (IFR) that provides acceptable navigational signal coverage and meets obstacle clearance requirements along the route. The MEA is critical for ensuring safe navigation in terms of both terrain clearance and the availability of radio navigation signals.

Adhering to the Minimum En Route Altitude allows pilots to maintain a safe altitude that avoids obstacles and provides the necessary signal for navigation aids such as VORs or GPS. Thus, knowing and following the MEA is a fundamental aspect of safe flight planning and operations in controlled airspace.