BRAKE OPERATION
(WITH ANTISKID)
The antiskid system is armed by placing the
ANTI-SKID switch in the ARM position.
D e p r e s s i n g o f t o e p e d a l s b y e i t h e r p i l o t
mechanically actuates brake metering valves,
metering pressure in proportion to pedal
deflection, first to the antiskid valves (Figure
14-15) and then to the brakes.
Hydraulic fuses in each brake line prevent ex-
cessive hydraulic fluid loss in the event of
brake leakage.
If an antiskid signal is generated by a wheel
sensor, the antiskid valve modulates braking
pressure as required to maintain optimum
braking.
When the pilot relaxes toe pressure on the
b r a ke p e d a l s , b r a ke p r e s s u r e i s r e t u r n e d
through the antiskid valves to the reservoirs.
BRAKE OPERATION
(WITHOUT ANTISKID)
Disengage the antiskid system by placing the
ANTI-SKID switch in the OFF position. Brake
operation is essentially the same as antiskid
braking, except the antiskid valves are not op-
erative. As a result, metered braking pressure
flows uninterruptedly from the metering valve,
through the antiskid valves, to the brakes.
There is no pressure modulation to return as in
antiskid braking; therefore, extreme caution is
required to prevent blown tires.
PARKING BRAKES
The parking brakes can be set with the PARK-
ING BRAKE handle (Figure 14-16). Fully
depress either set of pedals, pull the handle,
and rotate it 90° counter clockwise. This
mechanically latches the brake metering
valves in the open position, allowing avail-
able hydraulic pressure to be applied to the
brake assemblies. It also closes the return line
shutoff valve to prevent the No. 3 (inboard
system) antiskid valve leakage from bleed-
ing off inboard braking pressure (Figure 14-
15). In addition, it illuminates the PARKING
BRAKE light and the amber antiskid INBD
FAIL and OUTBD FAIL lights.
The parking shutoff valve is a spring-loaded
closed valve. When the PARKING BRAKE
handle (Figure 14-16) is released, 28 VDC is
provided through the INBD ANTI-SKID cir-
cuit breakers to energize the valve open.
Should this valve close in flight or fail to open
when the PARKING BRAKE handle is re-
leased, the INBD FAIL lights on the anti-skid
control panel will illuminate. In this event, the
antiskid system must be switched of to provide
a return for the hydraulic pressure through
the metering valves.
To release the parking brake, fully depress
the brake pedals, rotate the handle clockwise
90°, and allow the handle to stow.
FlightSafety Canada
L t é e
L t d .
CL-600-2B16 PILOT TRAINING MANUAL
14-12
CL 601-3A/R
FOR TRAINING PURPOSES ONLY
ANTI-SKID CONTROL PANEL
ANTI-SKID
INBD
FAIL
INBD
TEST
OUTBD
FAIL
OUTBD
TEST
TEST
ARM
OFF
Figure 14-14. Antiskid System Test