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Flightsurgeon created the topic: query in the exam
Respected all, there was one Question in the GK exam that I simply did not understand ( although I passed )
I cant recall exact but there was a question to check on the Magneto ground wire
it asked various options to either turn off the ignition, then testing the magnetos, or putting the engine on full RPM, or idle tne turning off the masters or the battery switch. There were various combinations of these. I couldnt really make sense of the wording and there were 5 options in contrast to the usual 4.
I know the mag check at 1700 and turning the mags left and right but I couldnt find anything in the books. Maybe Im not reading this carefully enough however, if anyone has thoughts I would be grateful
Checking the magneto for a 'dead cut' was once common practice but it seems to have lost favor in recent times.
The idea was to idle the engine just before shut-down then briefly turn the magnetos to 'off' and then back 'on' again. The idea was to observe a dead cut when the magnetos were turned 'off'.
If there was no dead cut it was an indication of a 'live magneto' that was likely to go undetected since the engine was eventually stopped by selecting idle cut-off with the mixture control. Selecting the mixture to idle cut-off ensures that the cylinders are left with no residual fuel.
It should be noted that an increasing number of RAA aircraft do not use magnetos, so the 'live magneto' problem does not exist.
