Which switch position provides ignition to both igniters when the engine is idle and operating?

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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

Which switch position provides ignition to both igniters when the engine is idle and operating?

Explanation:
Redundancy and reliability in the ignition system are the key ideas here. With two igniters, the flight (FLT) position energizes both igniters, ensuring sparks are available for lighting the fuel-air mix at idle and during normal operation. This dual-igniter energization helps prevent misfires or flameouts when thrust is low and conditions are more prone to instability. The other positions serve different flight–phases or shut the system off altogether, so they don’t guarantee ignition of both igniters during idle operation.

Redundancy and reliability in the ignition system are the key ideas here. With two igniters, the flight (FLT) position energizes both igniters, ensuring sparks are available for lighting the fuel-air mix at idle and during normal operation. This dual-igniter energization helps prevent misfires or flameouts when thrust is low and conditions are more prone to instability. The other positions serve different flight–phases or shut the system off altogether, so they don’t guarantee ignition of both igniters during idle operation.

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