MRA

Minimum Reception Altitude (MRA) refers to the minimum altitude prescribed for navigation aids, which provide radio guidance and assistance for aircraft navigation. The MRA ensures that the aircraft receives a strong and uninterrupted signal from the navigation aid that it is utilizing. It represents the lowest altitude at which an aircraft can receive a particular radio signal dependent on the navaid used.

An MRA can also serve as a reference altitude for pilots to maintain when flying an instrument approach to a runway, ensuring that they stay at a safe altitude above any terrain or obstacles in their flight path. Generally, MRAs are specified for each segment of an instrument approach, including initial, intermediate, and final approaches. The altitude may vary from one point to another, depending on the particular aircraft type and the navigation aid used.

In summary, MRA is a critical altitude that provides guidance to ensure safe aircraft navigation and obstacle avoidance during instrument approaches. It ensures that the pilot maintains a safe altitude above the terrain and obstacles during instrument approaches while also ensuring that radio signals are received without interference.