How is the anti-icing system activated?

• A. It activates automatically based on air temperature and flight conditions.
• B. The pilot manually activates the anti-icing system, signaling the FADEC to activate the anti-icing valves.
• C. It is activated by pulling a dedicated anti-ice switch on the throttle quadrant.
• D. It requires ground crew to energize the system before flight.

Answer: (B)

Activation starts with the pilot’s manual command using the anti-ice control. When the pilot engages anti-ice, that signal is sent to the FADEC, which then commands the anti-ice valves to open and regulates the bleed-air flow to the anti-ice circuits. This coordinated sequence ensures anti-icing is applied when requested and that the system operates safely with the engine and aircraft controls. It isn’t triggered automatically just by temperature or flight condition, and it isn’t something the ground crew energizes before flight. The key idea is manual selection by the pilot, with FADEC handling the valve actuation.