Which actions shall be taken if the rotor RPM indicator fails during cruise flight?
Refer to figure.
Engine RPM is a direct indication of power in piston engined aircraft, so the tachometer is a primary engine instrument that measures the rotational speed of the engine's crankshaft or the helicopter's main rotor in revolutions per minute, giving the pilot critical information on the engine's performance and helping to ensure that the aircraft is operating within safe and optimal RPM ranges.
The engine (T) and rotor RPM (R) needles are near each other in the same dual tachometer or can be separated. In powered flight, the needles will be joined, in autorotation, they will be split, as shown in the figure.
If the rotor RPM indicator fails during cruise flight, the appropriate action is to continue the flight as long as the engine RPM indicator is operational. This response is correct because the engine RPM indicator provides crucial information about the power setting and operation of the engine.
As long as the engine RPM is within acceptable limits, the rotor RPM is also likely to be within a safe range, ensuring continued safe flight operations. The engine RPM indicator can thus serve as a reliable substitute for monitoring the rotor RPM, allowing the pilot to maintain control and proceed safely to a suitable destination for repair.
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