Magneto Grounding check & Engine idle check during run up.
Asked by: Steve 3759 views Aircraft Systems, Commercial Pilot, Flight Instructor, General Aviation, Private Pilot, Student Pilot
Hi everyone,
In our school, in the shut down checklist we instantaneously turn the key from both to off and back to both to check 'grounding' of the magneto. I am not sure why we do this but all I know is that there is a p-lead wire on primary coil that runs back to cockpit.
Secondly, after the run-up check, we pull the throttle all the way idle and make sure RPM does not drop below 675RPM, do you know where does this number come from and why?
Lastly, how does high manifold pressure on engine can cause detonation?
Steve
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