BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual page 383

Figure 14-11. Nosewheel Steering
Controls
the steering actuator. Actuator motion is trans-
mitted through rack and pinion gears to steer
the nosewheels. As the wheels turn, mechan-
ical follow-up action returns the potentiome-
ter and control valve to neutral, stopping the
wheels at the selected position.
To exceed the normal steering control limit of
55° with differential braking, or for towing,
the system must first be deactivated by plac-
ing the N/W STEER switch in the OFF posi-
tion. This removes hydraulic pressure from the
system and allows free castering of the nose-
wheels up to 90° either side of center.
If the nosewheels are castered beyond 55°, the
rack and pinion mechanism disengages. When
direction is reversed, reengagement occurs.
14-10 CL 601-3A/R
CL-600-2B16 PILOT TRAINING MANUAL
N/W
STEER
ARMED
BRAKES
OFF
GENERAL
NW
STEER
The brakes can be applied by either pilot. The
FAIL
system has four multiple disc, self-adjusting
brake assemblies; one in each main landing
gear wheel. Fusible plugs in each main land-
ing gear wheel prevent fire blowout caused by
excessive heat that may result from hard brak-
ing. Outboard brakes are powered by No. 2 hy-
draulic system pressure; inboard brakes, by the
No. 3 system. A nitrogen-precharged (750
psi) accumulator (nose wheel well) in each sys-
tem provides pressure for as many as five
brake applications if a hydraulic system fails,
provided the antiskid system is not switched
on. Antiskid modulation would deplete accu-
mulator pressure very rapidly.
Braking pressure available from each hydraulic
system is shown on a dual BRAKE pressure
indicator ((Figure 4-12).
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
NOTE
Do not exert force on the steering con-
trol wheel. Do not position the N/W
STEER switch to the ARMED position
until reengagement has been made.
BRAKE
3
2
1
0
PSI
X 1000
IN
Figure 14-12. Brake Pressure Indicator
L t é e
L t d .
3
2
1
0
OUT