What is the maximum speed for ADG operation in the CRJ 900/700?

The correct answer pertains to the maximum speed for Automatic Dependent Surveillance - Broadcast (ADG) operation in the CRJ 900 and CRJ 700, which is indeed VMO/MMO. This designation stands for "Velocity Maximum Operating" for airspeed and "Mach Maximum Operating" for speed in a Mach number context, and it indicates the maximum aerodynamic limits of the aircraft.

To elaborate, VMO is the maximum speed at which an aircraft can safely operate at lower altitudes, while MMO is the maximum operating Mach number for higher altitudes. The aircraft is designed to handle speeds up to these limits during normal operations, including during ADG deployment. Therefore, understanding VMO and MMO as operational limits is crucial for ensuring safe maneuvers and avoiding structural damage.

The other options reflect specific speed thresholds that do not encompass the operational limits set specifically for ADG usage. Knowing VMO/MMO as the governing limits for aircraft operation ensures that pilots can operate within safe and effective parameters while utilizing systems like the ADG.