What is the function of the venturi on bleed air struts?

• A. On the struts to limit the amount of air allowed to be extracted
• B. In the cockpit to adjust fan speed
• C. In the engine to boost bleed air pressure
• D. On the tail to measure air temperature

Answer: (A)

The venturi on bleed air struts acts as a flow limiter in the bleed air line. By forcing the air through a narrow throat, it creates a controlled pressure drop that sets and limits how much air can be drawn from the engine. This helps ensure a stable, predictable bleed air supply for systems like environmental control or anti-ice, even as engine speed and demand change. It isn’t used in the cockpit to adjust fan speed, it doesn’t boost bleed pressure, and it isn’t a temperature sensor on the tail.