The windshield wiper must not be operated above what speed?

The windshield wiper must not be operated above what speed?

• A. 250 Knots
• B. 230 Knots
• C. 270 Knots
• D. 260 Knots

Answer: (A)

Windshield wipers have a maximum operating speed because aerodynamic forces on the blade and arm increase with airspeed. At higher speeds, those forces can cause flutter, misalignment, excessive wear, or even damage to the wiper mechanism or windshield. To protect the system and ensure clear visibility in rain, the limitation is set to 250 knots. Above that, the wipers should not be used, and other rain-removal methods or clean visibility are relied upon.

Windshield wipers have a maximum operating speed because aerodynamic forces on the blade and arm increase with airspeed. At higher speeds, those forces can cause flutter, misalignment, excessive wear, or even damage to the wiper mechanism or windshield. To protect the system and ensure clear visibility in rain, the limitation is set to 250 knots. Above that, the wipers should not be used, and other rain-removal methods or clean visibility are relied upon.