If you are running dual PMAG's or any kind of all electronic ignition your landing checklist should include the PMAG external power verified ON.
GUMPS check when you get to Switches would be a good time to verify that the external power is ON prior to the engine RPM getting low for landing. Remember the PMAG runs on internal power until the RPM gets too low, and then it switches to EXTERNAL POWER or DIES if the power is OFF.
I have connected both PMAG external power circuits to the Dynon EFIS which monitors the voltage and produces an aural and visual alarm if it is OFF.
GUMPS check when you get to Switches would be a good time to verify that the external power is ON prior to the engine RPM getting low for landing. Remember the PMAG runs on internal power until the RPM gets too low, and then it switches to EXTERNAL POWER or DIES if the power is OFF.
I have connected both PMAG external power circuits to the Dynon EFIS which monitors the voltage and produces an aural and visual alarm if it is OFF.