What is the maximum windscreen wiper operation speed?

• A. 200 KIAS
• B. 250 KIAS
• C. 310 KIAS
• D. 360 KIAS

Answer: (B)

Windscreen wipers have a certified maximum operating airspeed. As airspeed increases, aerodynamic forces on the wiper arms and the windscreen rise, which can overload the motor, cause flutter, or damage the windscreen or linkage. To keep the system safe and effective, it’s designed to operate up to a specific limit, commonly 250 KIAS. So 250 KIAS is the highest approved speed for wiper operation. Speeds around 200 KIAS are within limits but not the maximum, while 310 or 360 KIAS exceed what the system is approved to handle.