Definition of Minimum Reception Altitude (MRA)
Minimum Reception Altitude (MRA) is the minimum altitude at which an aircraft can receive reliable navigational signals from a VHF omnidirectional range (VOR), distance measuring equipment (DME), or global positioning system (GPS) to identify its position at an airway intersection. It is primarily used by pilots to conduct safe and accurate instrument approaches in low visibility conditions without the need for visual references.
MRA is a crucial safety factor in aviation as it ensures that pilots can accurately determine their position and prevent collisions with other aircraft. It is calculated based on the performance of the navigation aids and the accuracy requirements of the approach procedure. The MRA values are depicted on instrument approach charts and are usually presented in feet above mean sea level.
In addition to instrument approaches, the MRA is also essential for air traffic control (ATC) operations. Air traffic controllers must ensure that aircraft are flying at or above the MRA before directing them to a specific intersection or waypoint. Failure to comply with the MRA could result in a loss of situational awareness and potential accidents.
Overall, the Minimum Reception Altitude plays a critical role in ensuring safe and efficient air travel. It is essential that pilots and air traffic controllers understand the MRA values and adhere to them during operations.
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