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179 - EASA Drone A2 License - What is the 'Toilet Bowl Effect' (TBE) in a hovering multirotor?

Question 179 - Flight performance and planning - EASA Drone License A2

A situation where the drone flies in increasing circles instead of holding a steady hover, usually caused by compass interference or a mismatched GPS/Compass orientation
The drone plunging straight down into water
A feature used to clean the camera lens
The sound the motors make when the battery is dying

Training tests and timed exam simulations EASA Drone License A2