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retraction. Also, centering cams in the shock strut mechanically center the nose wheel as
the strut extends under its own weight.
If a failure is detected by the steering control unit, the system reverts to free castoring mode.
The pilot then maintains ground directional control through rudder control and differential
braking.
In the event of failure of No. 3 hydraulic system, the nose wheel is centered by the centering
cams. Rudder, differential braking and differential thrust will be used for directional control.
Reverse thrust and the ground spoilers will decelerate the aircraft, if the brakes are
degraded or fail completely.
The steering control unit continuously monitors the nose wheel steering system, and any
detected fault is display on the EICAS primary page. Detection of a fault, will result in
steering system shutdown. The system will then revert to free castoring mode.
REV 56, Jan 31/03
Vol. 1 16--50--2
LANDING GEAR
Nose Wheel Steering System
Flight Crew Operating Manual MASTER
CSP A--013
Nose Wheel Steering System Schematic
Figure 16---50---1
Nose Wheel Steering Tiller
Pilot’s Side Console
Nose Wheel Steering
Tiller (black)
Used to maneuver the
airplane on the ground.
The nose wheel steering
system is armed in flight
and enabled when the
airplane is on the ground
(gear down and locked
and WOW).
Heading Indicator and
Index Marks (white)
Indicates tiller selected
to center, 70 LH or RH.
Tiller is spring--loaded to
center.
Nose Wheel Steering
Switch
ARMED -- Nose wheel steering
is armed. Nose wheel steering
is activated with WOW.
OFF -- Nose wheel is set in the
free castoring mode.
NO.3 HYDRAULIC
SYSTEM
(FROM NOSE LANDING
GEAR DOWN LINE)
TO EICAS
RUDDER
PEDALS
28 VDC
BUS 1
NOSE LANDING
GEAR DOWN
AND LOCKED
WOW
ELECTRONIC
CONTROL
UNIT
ELECTROHYDRAULIC
SERVO VALVE
NOSE
WHEEL
STEERING
ACTUATORS
28VDC
BUS 2
N/W STRG
ARMED
OFF
PSEU
Vol. 1 16--50--3
REV 56, Jan 31/03
LANDING GEAR
Nose Wheel Steering System
Flight Crew Operating Manual
CSP A--013
MASTER
Nose Wheel Steering System <MST>
Figure 16---50---2
STEERING INOP
Primary Page
<0039>
<0006>
STEERING INOP
Caution (amber)
Indicates that the
steering system has
failed and reverted to
free castoring mode.
NOTE
If the STEERING INOP
message is displayed
with the system selected off,
this indicates that the
steering SOV has failed
(stuck) open. The N/W
STRG must be selected
on to enable centering
of the nosewheel.
REV 56, Jan 31/03
Vol. 1 16--50--4
LANDING GEAR
Nose Wheel Steering System
Flight Crew Operating Manual MASTER
CSP A--013
A. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Nose Wheel Control Unit
NOSE STEER DC BUS 1 1 F8
Steering NOSE STEER DC BUS 2 2 F8

　
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