Are RCM, FMEA, FMECA, and CBM independent processes?

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No way!  RCM is one-stop-shopping for all three.

It’s often misunderstood that Failure Modes and Effects Analysis (FMEA), Failure Modes Effects and Criticality Analysis (FMECA), and Condition Based Maintenance (CBM) are separate and distinct processes.  Absolutely not true.  On the contrary, all three are vital parts of the RCM process as a whole.

Steps one through four of the RCM process make up the FMEA.  And adding step five, Failure Consequences, to steps one through four make up the FMECA.  So when RCM is performed, the requirement for a FMEA or a FMECA is largely satisfied.

Condition Based Maintenance is embedded in step 6 of the RCM process.  So if you’re doing RCM, you’re already considering CBM.

When you do RCM, you do them all, and don’t let anyone else tell you differently.