With regard to the pneumatic mechanical devices which afford protection against the formation of ice, the only correct statement is: - ATPL

Question id 154 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

The Pneumatic Mechanical Device Can Only Be Used As An Anti-icing Device.

The pneumatic mechanical device is used a lot on modern aircraft as it is inexpensive and easy to maintain.

The inflatable de-ice boots of the pneumatic mechanical device are arranged perpendicular to the leading edges.

The pneumatic mechanical device can only be used as a de-icing device.