I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 53
FOR SIMULATION USE ONLY – NOT A TRAINING AID
NOSE WHEEL STEERING
Directional control during taxi is accomplished by the use of rudder and/or
differential braking, or by using hydraulic nose wheel steering (NWS).
The nose wheel is a free castoring type with 160° of castor (80° either side from
centre). Steering is mechanically operated through the rudder pedals and
hydraulically driven with pressure supplied by the aircraft hydraulic system.
The nose wheel steering actuator automatically centres the nose wheel when the
aircraft is in the air and the nose gear is not up and locked.
An actuator assembly, mounted on the forward side of the nose gear strut, includes
a selector valve, servo valve, and rotary actuator. The actuator assembly also
provides nose wheel shimmy damping. The selector valve includes a solenoid which
is electrically controlled by a switch located on each control stick grip to turn on
nose wheel steering.
The servo valve is operated by a push-pull cable connected to the rudder pedals to
command left or right steering.
A green advisory message; NWS, on the EICAS page, illuminates when nose wheel
steering is selected.
Power for the nose wheel steering system is provided through a circuit breaker,
placarded NWS, located on the generator bus circuit breaker panel in the front
cockpit.
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