Definition of Reverse Sensing in Aviation
Reverse sensing is a terminology used in aviation which refers to an anomalous behavior of the VOR (VHF Omnidirectional Range) navigation system. In normal operation, the VOR needle moves in a clockwise or counterclockwise direction depending on the aircraft’s position relative to the VOR station. However, in reverse sensing, the VOR needle appears to indicate the opposite direction, which means that the pilot may interpret the needle’s movement as indicating that the aircraft is heading in the wrong direction.
Reverse sensing usually occurs when a pilot uses a back course approach, which involves flying toward the VOR station along the same radial in the opposite direction. In this case, the VOR needle’s apparent reversal of operation can lead the pilot to fly away from the station instead of toward it, posing a serious safety risk.
To avoid reverse sensing, pilots must understand the VOR’s normal operation and be familiar with the conditions that may cause it to behave abnormally. They should also cross-check the VOR indications with other navigation aids, such as GPS or ADF, to confirm their position. In case of reverse sensing, the pilot should immediately recognize the anomaly and take corrective action, such as switching to a different navigation aid or using the VOR’s reverse sensing check feature to verify the system’s accuracy.
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