Turn and Bank indicator is really a Turn and Slip indicator shown wrong in many manuals.

[CaptScotty]

I've been noticing that many manuals show an instrument and call it a "Turn and Bank Indicator." It is a turn indicator, but it doesn't show bank.  It shows if the plane is in "coordinated" flight, meaning that the rudder is in the correct position.  If a plane has more drag on one wing than the other, the ball will be off to the side.  To correct this, you "Step on the ball" meaning pushing on the rudder on the side that the ball is off to.  This cuts the "side slip drag." If you have a 2 engine plane, if you lose one, You center the ball to cut drag to the minimum.  It has been called Turn and bank Indicator since I was a USAF flight Instructor in 1971.   This may clear some confusion on why you have bank and the "bank indicator" doesn't show any bank.  The correct bank indicator is the attitude indicator which has an UP Arrow or sometimes called a Sky Pointer.  If you find yourself in an unusual attitude, turn to put the "Sky Indicator" towards the sky. Most real pilots have learned this.

[silverdevil]

though i do not really know. this may be just a language barrier thing in translation. isn't it really called 'Turn and slip indicator'? a lot of warbirds had that indicator. i am not a pilot like you have been / are so i go with you  honestly in all my many years of sim-ing i considered that gauge useless unless i could not see well. i much prefer the artificial horizon. in A10, F16, F18 i reference it a lot.