What is the maximum allowed altitude during single-engine operations in the ERJ 170/175?

The maximum allowed altitude during single-engine operations in the ERJ 170/175 is FL250. This limitation is designed to ensure safety during circumstances where one engine may be inoperative, providing adequate performance margins and ensuring that the aircraft can maintain a safe altitude while still being able to control the aircraft effectively with just one engine.

Flying above this altitude in single-engine operations could lead to challenges in maintaining the necessary airspeed and altitude, increasing the risk during critical phases of flight. The limitations are specifically outlined in the aircraft's operational manual to prevent situations where the aircraft might not be able to comply with performance requirements or regulatory safety standards.

The other altitude options provide no safety advantage under single-engine conditions and exceed the operational limits established to ensure safe handling and performance of the aircraft. Moreover, flying at such altitudes could compromise both the aircraft's performance and the safety of the occupants.