What are the two anti-ice systems on the Boeing 737?

What are the two anti-ice systems on the Boeing 737?

• A. Bleed Air and Hydraulic
• B. Bleed Air and Electrical
• C. Electrical and Pneumatic
• D. Pneumatic and Hydraulic

Answer: (B)

The question is about how the Boeing 737 prevents ice from forming on critical surfaces. This aircraft uses two independent anti-ice methods: thermal anti-ice powered by bleed air to heat the wing leading edges and other surfaces, and electrical anti-ice that supplies heat to the windshield. In other words, one system uses hot air to keep the wings (and related surfaces) ice-free, while another uses electric heating elements in the windshields to prevent ice on the glass. Hydraulic or pneumatic systems aren’t used for anti-ice on the 737, so the combination of Bleed Air and Electrical is the correct pairing.

The question is about how the Boeing 737 prevents ice from forming on critical surfaces. This aircraft uses two independent anti-ice methods: thermal anti-ice powered by bleed air to heat the wing leading edges and other surfaces, and electrical anti-ice that supplies heat to the windshield. In other words, one system uses hot air to keep the wings (and related surfaces) ice-free, while another uses electric heating elements in the windshields to prevent ice on the glass. Hydraulic or pneumatic systems aren’t used for anti-ice on the 737, so the combination of Bleed Air and Electrical is the correct pairing.