Description of problem: The name of the startup script should be rtctl, not rtcl, in (3). http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.0/html/Real_Time_Deployment_Guide/sect-Real_Time_Deployment_Guide-Download-Installing_RT_using_Yum.html
<listitem> <para> <filename>rtctl</filename> is a startup script that sets the priorities of the various kernel threads. </para> </listitem> https://engineering.redhat.com/docbot/en-US/Red_Hat_Enterprise_MRG/1.0/html/Real_Time_Deployment_Guide/sect-Real_Time_Deployment_Guide-Download-Installing_RT_using_Yum.html