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The brakes are normally used as antiskid power
brakes but can operate as power brakes without
antiskid protection. In the event that brake
system hydraulic pressure is lost, emergency
braking is available.
The crew initiates braking by pressing on the
tops of the rudder pedals. The pedals connect
by cables to actuate the brake metering valve.
If both the pilot and copilot apply brakes simultaneously,
the one applying the greater
force on the rudder pedals has control.
CAUTION
WARNING
CITATION MUSTANG OPERATING MANUAL
CENTERING
FITTING
STEERING
OUTPUT
LEVER
BUNGEE
SPRING
STEERING
PIN
Figure 14-10. Nosewheel Steering
STOP BOLTS
Figure 14-11. Stop Bolt Location
510OM-00 14-15
CITATION MUSTANG OPERATING MANUAL
ANTISKID
CONTROL VALVE
DIGITAL
ANTISKID
CONTROL UNIT
BRAKE
METERING
VALVE
P P P
SHUTTLE VALVES
PARKING BRAKE
VALVE
EMERGENCY
BRAKE VALVE
EMERGENCY
BRAKE HANDLE
OVERBOARD
VENT LINE
EMERGENCY BRAKE
NITROGEN BOTTLE
PILOT/COPILOT RUDDER PEDALS
TO GEAR EXTEND
TO GEAR RETRACT
HYDRAULIC
SYSTEM
RESERVOIR
29-VDC
HYDRAULIC PUMP
ACCUMULATOR
CABIN AIR
CONTROL
MANIFOLD
PARKING BRAKE
FROM GEAR RETRACT
PRESSURE LINE
(FOR TIRE SPINDOWN)
MANUAL
ACCUMULATOR
BLEED VALVE
SYSTEM PRESSURE
LEGEND
RETURN
METERED PRESSURE
CABIN AIR
NITROGEN EXHAUST
NITROGEN
HYD PRESS LO
HYD PUMP ON
ANTISKID FAIL
NO TIRE SPINDOWN
Figure 14-12. Power Brake and Digital Antiskid System
14-16 510OM-00
CITATION MUSTANG OPERATING MANUAL
Antiskid System
With the ANTI SKID switch in the up (on) position,
the antiskid system provides maximum
braking efficiency on all runway surfaces. The
antiskid control system can only reduce pressure;
the applied pressure can never be more
than that commanded by the crew.
A wheel speed transducer on each wheel electronically
transmits wheel-speed signals to
the antiskid control box as a variable frequency.
If the control box detects sudden deceleration
of a wheel (impending skid) it
commands the antiskid valve to reduce pressure
to that specific wheel/brake. When the
slow wheel catches up to the fast wheel and
the transducer signal returns to normal, braking
pressure is restored to the brakes.
The antiskid system includes “touchdown protection,”
which prevents landing with the
brakes locked. Any time both squat switches
indicate that the aircraft is in the air and the
gear is extended, the antiskid unit dumps brake
pressure (except during gear retraction when
braking is applied to spindown the wheels).
Upon landing, this dump continues for 3 seconds
after weight-on-wheels or until wheel
spinup (whichever occurs first), before brake
pressure is enabled.
During high-speed ground movement, “lockedwheel
crossover protection” prevents sudden
yawing due to differential braking. If the antiskid
controller senses a 70% difference in
speed between left and right brakes, it reduces
brake pressure to both wheels. At low speeds
(approximately 12 knots), this feature is disabled
to permit tight turns during taxiing.
Parking Brakes
Parking brakes are a locked configuration of the
brakes. Brakes are locked when the parking
brake valve traps hydraulic fluid in the brake
lines. The valve (and hence the parking brakes)
can only be set by pulling on the PARKING
BRAKE knob on the right lower side of the
pilot instrument panel (Figure 14-13) while
pressing on the brake pedals.
Emergency Brakes
If the hydraulic brake system fails, a pneumatic
brake system is available to actuate the wheel
brakes (Figure 14-14). The system uses nitrogen
pressure from a pneumatic bottle independent
of emergency landing gear extension system.
Pulling on the EMERGENCY BRAKE handle
(under the center of the pilot left tilt panel) actuates
the emergency brake system. Pull out
and hold the handle aft to apply and modulate
emergency braking pressure. The lever has a stop
to prevent locking the brakes and blowing the
tires. The emergency brakes are effective for six
pulls on the handle. No electrical power is required
for the emergency brakes.
COMPONENTS
Brake Pedals
Brakes are normally actuated by the pilot or
copilot pressing on the tops of one or more
of the rudder pedals. Each pedal is mechanically
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