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A miniature aircraft with a ball in a curved tube below.
Also known as: Turn and slip indicator, Turn and bank indicator, Slip indicator, Aircraft with a ball below
The turn coordinator shows rate of turn above and a ball below showing whether the turn is coordinated. The rule is 'step on the ball' — press the rudder on the side the ball has slid to — and an uncoordinated turn is what turns a stall into a spin.
Denotes the instrument showing rate of turn together with an inclinometer ball indicating whether the turn is coordinated.
Contexts: Vehicle dashboard
Is read by the rule 'step on the ball': rudder is applied on the side the ball has displaced to, returning it to centre.
Contexts: Vehicle dashboard
Matters because an uncoordinated turn at low speed is what converts a stall into a spin, which is the specific hazard the ball guards against.
Contexts: Vehicle dashboard
Indicates rate rather than angle of bank, so a standard-rate turn is marked on the face regardless of the bank required to achieve it.
Contexts: Vehicle dashboard
A circular face with a small aircraft symbol seen from behind that rolls left and right against index marks, above a curved glass tube containing a black ball between two vertical lines.