What is the primary method for moving fuel from the collector tanks to the engines?

The primary method for moving fuel from the collector tanks to the engines in the CRJ550 is through the main ejectors. These ejectors utilize the Venturi effect, where a flow of high-pressure fuel creates a low-pressure zone, effectively drawing fuel from the collector tanks into the fuel supply line leading to the engines. This system is efficient and relies on the principle of fluid dynamics to maintain fuel flow under various operating conditions.

Using main ejectors to move fuel has advantages such as reduced mechanical complexity compared to pump-based systems and provides a way to maintain fuel circulation without requiring powered fuel pumps. This is particularly beneficial in ensuring that fuel is readily available to the engines during flight, especially in situations where fuel management is critical.

In contrast, other methods such as main pumps would be more appropriate for different scenarios or specific functions within the fuel system, while transfer ejectors typically play a role in moving fuel between tanks, rather than directly supplying the engines. Pneumatic systems are not involved in fuel movement; they serve other functions within the aircraft's operations.