How is the max landing weight determined primarily for the ERJ 170/175?

The maximum landing weight for the ERJ 170/175 is primarily determined by structural limitations to ensure the aircraft can safely land and withstand the forces experienced during landing. While options might suggest considerations around runaway length, go-around capability, or fuel capacity, the underlying factor is the structural integrity of the aircraft.

Each aircraft has a maximum certificated landing weight established during certification processes that considers the airframe's limits, allowing it to handle the loads without risking structural failure. This weight ensures that the aircraft can be operated safely within its intended parameters upon landing, considering factors like load distribution across the landing gear, wing flexing, and overall design limits of the airframe. Thus, the correct answer reflects that the determination is fundamentally based on the aircraft's structural capabilities.