NAVIGUIDE 4000 056336 Rev. AA2.3: Operating Procedures Page 2–152.3 Operating Procedures2.3.1 Engaging / Disengaging Bus Steering2.3.1.1 In Systems with a Mechanical Mode SelectorIf a mechanical steering mode selector is installed at the main steering position,bus steering is automatically engaged or disengaged by selecting the desiredsteering mode (see 2.3.2.1).2.3.1.2 In Systems with a Steering Mode Selector / NFU TillerIf a Steering Mode Selector / NFU Tiller is installed at the main steering position,bus steering is engaged by putting the selector to „Secondary“. Bus steering isdisengaged by putting the selector to „Non Follow Up“.After the selector has been put to „Secondary“, the system will be in the FU steer-ing mode with the main steering position being active.Subsequent changeover to a different bus steering mode or steering position isaccomplished by the Steering Mode Selector (SMS) and the Steering Position Se-lector (SPS) bus interface units respectively.WarningThe person in charge of navigation must ensure that all personnel have aworking knowledge of the steering mode selection and control transfermethods used for the particular installation, including optional override ca-pabilities at devices external to the system. Inappropriate operation couldresult in hazards to navigation, resulting in danger to personnel.When the Takeover control transfer method is configured or when overridedevices are installed at remote steering positions, it is important to realizehow easy it is to take over control at a new steering position. Personnel ac-cess to positions with takeover and/or override devices must be appropri-ately restricted or monitored.NoteIn certain cases, instead of the Steering Mode Selector / NFU Tiller, a mechanicalmode switch with only two possible selections (bus steering / non-bus steering)may be installed. The function of such a selector is identical to that of the SteeringMode Selector / NFU tiller.
