What is the minimum speed for the CRJ900 at FL330?

The correct choice is Mach .74 for the minimum speed of the CRJ900 at flight level 330 (FL330). This minimum speed is crucial for ensuring safe operation and fuel efficiency at cruising altitudes. In the context of aviation, aircraft typically have a minimum operating speed (also known as minimum cruise speed) at different flight levels to optimize performance and maintain stability.

At FL330, maintaining a speed of Mach .74 allows the CRJ900 to operate efficiently within its flight envelope, balancing the need for speed with the aerodynamic advantages provided at higher altitudes. This speed ensures that the aircraft remains above stall speed while also allowing for sufficient control authority and engine performance during cruise flight.

The options provided reflect typical performance categories for the aircraft, and while the other speeds listed may be valid at different altitudes or under different conditions, Mach .74 is established as the appropriate minimum for safe and efficient operation specifically at FL330. Understanding this helps pilots make informed decisions regarding cruise settings and fuel management.