LANDING GEAR AND
BRAKES
AIRPLANE
OPERATIONS
MANUAL
2-12-15
Page
2
Code
01
REVISION 40
AOM-145/1114
The steering system may be manually disengaged through buttons
located on the pilots' control wheels and allows free steer of the nose
wheel. The STEER INOP message appears when the Steering
Disengage Button is pressed. This is a system characteristic and not a
malfunction. Automatic system disablement occurs as soon as the
airplane is airborne. Nose wheel centering with the nose gear shock
absorber extension is provided by a cam. The nose wheel is also
centered by caster effect whenever the system is disengaged.
If the Electronic Control Module detects a failure, the EICAS is
signaled to present a caution message. In these cases, for airplanes
Post-Mod. SB 145-32-0104 or with an equivalent modification factory
incorporated, the tiller commands will be inhibited if wheel speed is
above 25 kt.
Optionally, some airplanes are equipped with an external Steering
Disengagement Switch which allows ground personnel to disengage
steering prior to towing operations. The switch actuates directly on the
steering system, shutting its power down. The disengagement switch
inhibits the steering actuation commanded by the steering handle and
the rudder pedals. A caution message is displayed on the EICAS
whenever the steering system is disengaged by the external switch.
Steering Disengagement Switch is installed in a compartment on the
left front fuselage.
EICAS MESSAGES
TYPE MESSAGE MEANING
CAUTION STEER INOP
Steering system is inoperative.
Message is presented only on
ground.
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