In the described condition, what does placing the engine start switch in CONT provide?

Study for the Engines Auxiliary Power Unit Test. Prepare with multiple choice questions. Each question comes with hints and explanations. Ensure you're ready for the exam!

Multiple Choice

In the described condition, what does placing the engine start switch in CONT provide?

Explanation:
During start you need both fuel and a reliable flame source. Putting the engine start switch in CONT energizes both igniters and opens the start valve, so fuel can reach the combustor while a continuous spark is available. This combination provides a stable light-off and helps prevent flameout as air flows through the engine during start. If only one igniter were energized or the start valve didn’t open, the engine would have a much harder time starting. If ignition is off or fuel is not allowed to flow, there is no start at all.

During start you need both fuel and a reliable flame source. Putting the engine start switch in CONT energizes both igniters and opens the start valve, so fuel can reach the combustor while a continuous spark is available. This combination provides a stable light-off and helps prevent flameout as air flows through the engine during start. If only one igniter were energized or the start valve didn’t open, the engine would have a much harder time starting. If ignition is off or fuel is not allowed to flow, there is no start at all.

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