Which statement best defines MMO?

Which statement best defines MMO?

• A. Maximum Mach Output
• B. Maximum Mach Operating number
• C. Minimum Mach Operating number
• D. Maximum Mach Operations

Answer: (B)

MMO stands for the maximum operating Mach number—the highest Mach at which an aircraft is permitted to operate safely in flight. This limit protects the airplane from adverse compressibility effects, such as shock formation, buffet, and potential loss of control, which can occur as speeds approach transonic conditions. It’s a design and certification limit tied to the aerodynamics and structural capabilities of the airframe and can change with altitude to keep the aircraft within its safe flight envelope. Other phrasings don’t specify a certified speed limit for safe operation, so they don’t capture what MMO represents.

MMO stands for the maximum operating Mach number—the highest Mach at which an aircraft is permitted to operate safely in flight. This limit protects the airplane from adverse compressibility effects, such as shock formation, buffet, and potential loss of control, which can occur as speeds approach transonic conditions. It’s a design and certification limit tied to the aerodynamics and structural capabilities of the airframe and can change with altitude to keep the aircraft within its safe flight envelope. Other phrasings don’t specify a certified speed limit for safe operation, so they don’t capture what MMO represents.