On an aeroplane, spoilers are:
Domanda 73, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license
| Upper Wing Surface Devices, Their Deflection Is Always Asymmetrical. |
| Lower Wing Surface Devices, Their Deflection Is Symmetrical Or Asymmetrical. |
| Lower Wing Surface Devices, Their Deflection Is Always Asymmetrical. |
| Upper wing surface devices, their deflection is symmetrical or asymmetrical. |
