What happens if both FADEC channels fail or the FADEC loses power?

• A. The engine will fail
• B. The engine continues with reduced power
• C. FADEC automatically switches to backup mode
• D. The engine surges but remains running

Answer: (A)

FADEC is the engine’s primary authority for fuel metering and ignition, using two redundant channels to prevent a single failure from stopping control. If both channels fail or FADEC loses power, there is no active electronic control guiding the engine. Without that command, fuel flow and ignition cannot be managed, so the engine cannot be sustained and will flame out (shut down). The other scenarios would require some remaining FADEC control or a functioning backup, which isn’t available when both channels fail or power is lost.