Which of the following options states the working principle of a vertical speed indicator?
Domanda 87, Aircraft General Knowledge - PPL(A) English - Private Pilot License (Aircraft)
| Measuring the present static air pressure and comparing it to the static air pressure inside a reservoir |
| Total air pressure is measured and compared to static pressure |
| Measuring the vertical acceleration through the displacement of a gimbal-mounted mass |
| Static air pressure is measured and compared against a vacuum |
