Is enroute use of flaps permitted on the ERJ 170/175?

The enroute use of flaps on the ERJ 170/175 is prohibited, aligning with the operational limitations set forth in the aircraft's flight manual. Flaps are designed primarily for use during takeoff and landing phases to enhance lift and control at lower speeds. Their deployment enroute could lead to undesirable flight characteristics, including increased drag and potential issues with aircraft handling and stability.

By restricting flaps to takeoff and landing, the manufacturers ensure that pilots operate the aircraft within safe envelope parameters, maximizing performance and ensuring compliance with safety regulations. This limitation helps mitigate risks associated with unusual configurations during cruise flight, which could compromise the aircraft's performance and safety.