NOSE WHEEL STEERINGThe steering system uses the yellow hydraulic system to operate a steering actuating cylinder, which changes the direction of the NLG wheels.The steering system receives hydraulic pressure in the following conditions:- A/SKID & N/W STeeRinG switch is in ON position,- towing control lever is in normal position,- at least one ENG MASTER switch is ON,- aircraft is on ground.The steering system is controlled by the BSCU, which receives order from:- the steering hand wheels (orders added algebraically),- the rudder pedals,- the autopilot.When the rudder pedal disconnect pushbutton is pressed in, N/WS is disconnected from the pedals.The BSCU transforms the orders into N/WS angle. That angle has the following limits:- Ruder pedals: max 6 degrees,- Hand wheels: max 74 degrees.The NLG is equipped with Rotary Variable Differential Transducers (RVDTs), which are used as feedback sensors to the BSCU.