20-20 Lubrication
WARNING
Review appropriate Safety Data Sheet (SDS) when working in
proximity to hazardous materials. Specific recommendations
for use of personal protective equipment are located in the SDS.
All R66 bearings are sealed or self-lubricating and do not require periodic lubrication.
The engine oil tank, the main and tail rotor gearboxes, and the hydraulic reservoir require
servicing when indicated by sight gage level. Additionally, change engine, gearbox, or
hydraulic oil and clean respective sight gage when oil becomes so dirty its level cannot be
determined. Change hydraulic oil if notedly odorous.
When installing a new or overhauled main rotor gearbox, replace filter at first 100-hour
inspection after installation. Thereafter, replace filter at scheduled intervals per § 5-20.
When installing a new or overhauled tail rotor gearbox, drain and flush after first 4 hours
of flight or first chip light, whichever occurs first. Thereafter, drain and flush gearbox at
scheduled intervals per § 5-20.
Servicing procedures are located in Chapter 12.
JUL 2020 Chapter 20 Standard Practices Page20.2A
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