What should be done if ice accumulation is detected in-flight on the ERJ 170/175?

When ice accumulation is detected in-flight on the ERJ 170/175, the correct action is to select ice protection mode to ON. This setting activates the aircraft's ice protection systems, which are designed to prevent ice from forming on critical surfaces, such as the wings and tail, and to remove any existing ice accumulation. The systems include heated surfaces and activated wing and tail de-icing features, which are crucial for maintaining safe aerodynamic performance and ensuring control of the aircraft.

Increasing altitude, while it may seem reasonable since warmer air typically exists at higher altitudes, does not directly address the immediate issue of ice accumulation or guarantee the absence of ice in higher altitudes. It is also possible that ice can still form at higher altitudes if conditions are favorable.

Reducing speed could potentially lead to an increase in stall risk or other aerodynamic issues, and is not a recommended procedure for addressing ice accumulation.

Turning off the de-icing systems would be counterproductive, as this would allow for further ice buildup, increasing the risk of impaired flight performance, and potentially leading to a more serious situation.

Selecting the ice protection mode to ON is the only correct immediate action that directly addresses the problem of ice accumulation, enabling the appropriate systems to function and restore safe