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Which function remains unaffected when the cross feed switch is repositioned?

The override function for auxiliary fuel transfer

The move of the cross feed switch changes which fuel path between the wings is used to balance fuel. The override function for auxiliary fuel transfer is a separate, dedicated control path with its own pump/valve setup that operates independently of the normal crossfeed route. Because it’s independent, repositioning the cross feed switch doesn’t disable or alter the override capability, so you can still manually initiate auxiliary fuel transfer as needed.

Other systems aren’t driven by the crossfeed logic. The engine ignition sequence depends on the ignition system and start circuitry, not on fuel crossfeed positioning. The cabin pressure controller operates from the pressurization system, separate from the fuel routing. The standby electrical bus has its own power sources and isn't affected by crossfeed selection either.

The engine ignition sequence

The cabin pressure controller

The standby electrical bus

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