Hi all. At various times while trying to start or taxi, the Return to Home/Continue Flying/View Map screen will appear for no apparent reason, without me prompting it to open by clicking the Esc key. This problem is isolated to my Turbo Commander 690B. Have any of you experienced this problem with this aircraft? My second issue is related to the NTS Test Switch. When I perform the test on the NTS system, the NTS warning lights illuminate when they aren't supposed to during the test. First of all, what is the NTS system. Secondly, Has anyone else had this problem. Thirdly, how can the problem I am facing be rectified?

Hi,

NTS is Negative Torque Sensing.

NTS is not modelled by Carenado. Just a dummy switch.

The purpose of the NTS on TPE331 engines is to force the propeller towards high pitch in order to reduce drag in case of loss of power. When the system senses that the propeller is  driving the engine (negative torque), it will dump the oil out of the propeller hub and let the springs and counterweights move the blades toward high pitch /low RPM. This is not an auto feather, as you will still have to feather the prop manually, but will help greatly to maintain directional control in case of engine failure. Without NTS, the propeller governor, sensing a loss of power (= loss of RPM) will move the propeller towards high RPM to compensate and thus increase drag on the failed engine.