Using the automatic start for starting an engine on the ground, how many igniters will activate?

Using the automatic start for starting an engine on the ground, how many igniters will activate?

• A. Three
• B. Four
• C. Two
• D. One

Answer: (D)

Ignition during an automatic ground start is designed to light off the engine with a single spark source. In this mode, only one igniter is energized to initiate combustion, while the other igniter remains off unless a light-off problem occurs and the system switches to using the second channel. This keeps the start simple and reduces electrical load, yet still preserves redundancy if the first igniter fails. So, during an automatic ground start, only one igniter will activate.

Ignition during an automatic ground start is designed to light off the engine with a single spark source. In this mode, only one igniter is energized to initiate combustion, while the other igniter remains off unless a light-off problem occurs and the system switches to using the second channel. This keeps the start simple and reduces electrical load, yet still preserves redundancy if the first igniter fails. So, during an automatic ground start, only one igniter will activate.