Which item is listed as a critical surface for de-icing procedures?

• A. Ram air intake for engines, instruments, sensing points, fuel vents
• B. Passenger seating area
• C. Beverage carts
• D. Overhead bins

Answer: (A)

During de-icing, the focus is on surfaces whose icing could directly affect flight safety. The ram air intake for engines, instruments, sensing points, and fuel vents is a critical surface because it’s an opening that feeds air to propulsion and air-data systems and houses sensors. Ice here can block airflow to the engine, risking ingestion or loss of proper engine operation, and can cover sensors such as pitot/static ports and air data sensors, leading to incorrect airspeed, altitude, or attitude readings. Ice blocking fuel vents can also cause pressure problems or fuel system issues. Interior items like passenger seating, beverage carts, or overhead bins don’t interact with airflow or essential systems, so they aren’t addressed in de-icing procedures.