Medium vibration of 4 to 6 times per revolution is inherent in most helicopter rotors. The primary control method is
- inspect loose fixtures and fittings
- design of engine and gearbox supports
- inspect main rotor head and main drive shaft
Explanation from PART66Online
Medium frequency vibration at 4 to 6 per rev is inherent in most rotors, so it cannot be inspected out. It is controlled at source by the design of the engine and main gearbox supports, through which rotor and transmission forces at that frequency reach the fuselage. A loose fixture or fitting, such as a skid, only raises its level, and faults in the main rotor head and blades show up as low frequency 1/rev vibration.
sam1969 asked · 9 Aug 2015
I selected
-Design of engine and gearbox supports
Medium and High frequency Vibrations – Depending on the helicopter the source may be engine and transmission cooling fan and accessories such as air conditioner compressors, or driveline components.
Any ideas?
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