For the ERJ 170/175, which weight is primarily limited by brake energy?

The weight that is primarily limited by brake energy for the ERJ 170/175 is the maximum landing weight. This limitation is in place because, upon landing, the aircraft's brakes must dissipate the kinetic energy generated during the landing process. The energy that needs to be managed is directly proportional to the landing weight of the aircraft.

If the aircraft were to exceed the maximum landing weight, the brakes may not be able to adequately absorb this energy, leading to potential brake overheating or failure. This is a significant safety concern, as effective braking is critical for safely stopping the aircraft on landing. Therefore, the maximum landing weight is specifically limited to ensure that the braking system can handle the energy generated during landing within safe operational parameters.

The other weight limitations, such as maximum takeoff weight, maximum ramp weight, and maximum operational weight, are influenced by different factors like structural integrity and performance during takeoff rather than exclusively focusing on brake energy concerns.