During normal start sequences, ignition is supplied to which igniters?

During normal start sequences, ignition is supplied to which igniters?

• A. Only the left igniter
• B. Only the right igniter
• C. Both igniters in both engines
• D. Neither igniter

Answer: (C)

Ignition redundancy during start is the key idea. Modern engines typically have two igniters per engine so that if one igniter or its wiring fails, the other can still ignite the fuel–air mixture. During a normal start, both igniters in each engine are energized to maximize the chance of a reliable, first-light ignition. Energizing only one igniter would raise the risk of a failed start if that single path failed, and energizing neither would prevent ignition altogether. With two igniters in both engines, the system provides a robust, dependable start.

Ignition redundancy during start is the key idea. Modern engines typically have two igniters per engine so that if one igniter or its wiring fails, the other can still ignite the fuel–air mixture. During a normal start, both igniters in each engine are energized to maximize the chance of a reliable, first-light ignition. Energizing only one igniter would raise the risk of a failed start if that single path failed, and energizing neither would prevent ignition altogether. With two igniters in both engines, the system provides a robust, dependable start.