The FADEC is powered by the aircraft electrical system for ___ after the aircraft is first powered.

The FADEC is powered by the aircraft electrical system for ___ after the aircraft is first powered.

• A. 5 minutes
• B. 10 minutes
• C. 2 minutes
• D. 15 minutes

Answer: (A)

The main idea is that FADEC needs a reliable power source long enough to complete its startup sequence. When the aircraft is first powered, the FADEC is energized from the aircraft electrical system for a fixed period of five minutes. This window is specified so the FADEC can perform its self-test, initialize sensors, and load initial control maps during the critical start phase, even before engine-driven power sources are fully online. After those first minutes, power will be supplied by the normal engine electrical sources, ensuring the FADEC remains powered through the start and early operation. The five-minute duration is chosen to cover the typical startup and initialization time, which is why it is the correct choice.

The main idea is that FADEC needs a reliable power source long enough to complete its startup sequence. When the aircraft is first powered, the FADEC is energized from the aircraft electrical system for a fixed period of five minutes. This window is specified so the FADEC can perform its self-test, initialize sensors, and load initial control maps during the critical start phase, even before engine-driven power sources are fully online. After those first minutes, power will be supplied by the normal engine electrical sources, ensuring the FADEC remains powered through the start and early operation. The five-minute duration is chosen to cover the typical startup and initialization time, which is why it is the correct choice.