Engines Auxiliary Power Unit (APU) Practice Exam

Which statement best describes the CONT position when the engine is running with the start lever in IDLE?

ignition to both igniters and opens the start valve ignition to the selected igniter and opens the start valve no ignition is provided ignition to the selected igniter and does not open the start valve

Correct Answer:

ignition to the selected igniter and does not open the start valve

Explanation:

When the start lever is in idle and CONT is selected, the ignition system stays active on the chosen igniter to maintain flame stability, but the start valve remains closed because starting air is no longer needed once the engine is already running. In this mode you want a single, continuous spark to keep combustion reliable, not air being delivered for starting. So ignition to the selected igniter plus no opening of the start valve best describes the CONT position during idle operation.

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