What is the maximum speed for the operation of the windshield wipers?

• A. 150
• B. 250
• C. 200
• D. 300

Answer: (B)

Windshield wipers have a defined maximum operating airspeed because the airflow imposes forces on the wiper mechanism. If you go above that limit, the wind can overwhelm the wipers, causing excessive stress, misalignment, or damage to the wiper arms, blades, or windshield. For this aircraft, the maximum allowed wiper speed is 250 knots. That makes 250 knots the highest permissible setting; speeds below that are within limits, while speeds above it are not permitted.