What is the maximum Mach number (MMO) for the CRJ-900?

The maximum Mach number (MMO) for the CRJ-900 is indeed 0.85 Mach. This means that the aircraft can operate efficiently at high subsonic speeds up to this limit. Exceeding the MMO could result in various aerodynamic issues and increase drag significantly, thereby affecting performance and safety.

In commercial aviation, knowing the MMO is crucial for flight planning and ensuring that the aircraft is used within its operational limits, maintaining structural integrity and overall safety. This limit is set based on the aircraft's design and testing, which factors in structural capabilities and aerodynamic characteristics. The specified MMO provides pilots and crews with a clear guideline for safe operation during all phases of flight, especially when cruising at higher altitudes where speed management is essential.