FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

The correct answer is A - Compressor bleed air, aircraft electrical system. For the operation of a wing thermal anti-icing system, heat can be obtained from compressor bleed air and the aircraft electrical system. Compressor bleed air is often used because it is a readily available source of hot air that can be utilized to prevent ice formation on the wing surfaces. The aircraft electrical system can also be used to provide heat through electrically heated elements in the wing leading edges.

Option B - Hydraulic system, solar energy, is incorrect because while a hydraulic system can generate heat, it is not typically used for wing thermal anti-icing. Solar energy is also not a practical source for generating immediate heat to prevent ice formation on the wings.

Option C - Engine exhaust, chemical reactions, is incorrect as engine exhaust and chemical reactions are not typically used as heat sources for wing thermal anti-icing systems.

Option D - Fuel combustion, friction-based systems, is incorrect because although fuel combustion generates heat, it is not a direct source used for wing thermal anti-icing systems. Friction-based systems are also not typically used for this purpose in aircraft.