aircraft systemsFAA-published sample question (AGI, Aug 2021)
If the ground wire between the magneto and the ignition switch becomes disconnected, the most noticeable result will be that the engine
A
will run very rough.
B
cannot be started with the switch in the ON position.
C
cannot be shut down by turning the switch to the OFF position.✓ Correct Answer
Explanation
The ignition switch turns a magneto off by grounding it through the P-lead. If that ground wire is disconnected, the magneto stays 'hot' and PHAK notes the engine cannot be shut down with the switch, a hazard when anyone moves the propeller. The engine still starts and runs normally.
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