ENG Ignition power sources: which statement is correct?

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Multiple Choice

ENG Ignition power sources: which statement is correct?

Explanation:
Engine ignition needs a reliable electrical source to drive the igniters with the proper AC power. The built-in redundancy uses two paths: one ignition channel is fed from System A’s AC power, while the other channel uses the Battery bus routed through a static inverter to produce the required AC power. This setup ensures ignition can operate from normal AC power, and also during electrical faults by relying on the battery-backed inverter. The other options don’t provide the necessary electrical energy form: APU bleed is pneumatic, hydraulic pressure isn’t used for ignition, and cabin air isn’t involved.

Engine ignition needs a reliable electrical source to drive the igniters with the proper AC power. The built-in redundancy uses two paths: one ignition channel is fed from System A’s AC power, while the other channel uses the Battery bus routed through a static inverter to produce the required AC power. This setup ensures ignition can operate from normal AC power, and also during electrical faults by relying on the battery-backed inverter. The other options don’t provide the necessary electrical energy form: APU bleed is pneumatic, hydraulic pressure isn’t used for ignition, and cabin air isn’t involved.

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