Flight instrument indicating the position of the aircraft in relation to the horizontal plane, viz. gradient and bank of the aircraft.  During flight it provides a substitute for the natural horizon. It also acts as a transmitter for other equipment of the angle of bank and pitch.  The pitch indication is shown by means of a transverse clinometer with a ball in the lower part of the face of the instrument.  The instrument signals the non-operative state of the gyromotor by means of a red flag. It gives a signal when reaching a transverse bank of  32 in flight and 15 during climb and approach.