Medium vibration of 4 to 6 times per revolution is experienced on a helicopter. 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
A medium-frequency vibration of about 4 to 6 times per main-rotor revolution points to the main rotor head and main drive-shaft area rather than the rotor blades themselves. The primary control method is therefore to inspect the main rotor head and drive shaft, since blade-related faults produce one-per-rev (low-frequency) 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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