While inertial platform system is operating on board an aircraft, it is necessary to use a device with the following characteristics, in order to keep the vertical line with a pendulous system:
Domanda 207, Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license
| Without damping and a period of about 84 minutes |
| Without damping and a period of about 84 seconds |
| With damping and a period of about 84 minutes. |
| With damping and a period of 84 seconds |
