In a research study preventing tail-rotor bearing failure - a catastrophic failure - the customer needed to be able to measure the oil level in the rotor hub oil reservoir.
Gill R&D design and supply an oil level sensor for the rear rotor hub of a CH-53 helicopter to help prevent tail rotor bearing failure. http://gillrd.com/applications/2014/05/gill-oil-level-sensor-helicopter-rear-rotor-hub/
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