Teaching Simulated Engine Failures – Throttle Chops in Helicopter Training
One technique that I learned from an instructor with 30+ years of experience is teaching simulated engine failures (“throttle chops”) by rolling off the throttle on a Robinson only enough to split the needles and bring the engine down to 90% RPM. That way, if the student does not react properly, the rotor speed will not drop below 90% (once it gets to 80%, you are dead; the trip from 90 to 80% in an R22 with the collective still up takes about 1 second).
You can generate the nose yaw and the low RPM horn without chopping the throttle to idle. This also makes sense in helicopters where there is a risk that the engine will actually quit if the throttle is chopped suddenly, e.g., older R44 Raven IIs.
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