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greater than 3200 psi
– brake pressure is less
than 1015 psi.
P604_15_020
LANDING GEAR / BRAKES
15-18 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Parking Brake
To apply the parking brake, fully depress both brake pedals on the pilot’s or copilot’s
side, pull the parking brake handle and rotate it 90° to the locked position. To release,
fully depress both brake pedals, rotate the parking brake handle to the unlocked
position and push it down. Both the inboard and outboard brakes will hold when
hydraulic systems 2 and 3 are pressurized and the parking handle is set. When the
hydraulic systems are selected off, only the inboard brakes will hold for a prolonged
period.
EICAS indicates normal parking brake engagement with the PARKING BRAKE ON
advisory EICAS message.
If the parking brake is engaged with the aircraft in takeoff mode, a PARKING BRAKE
warning EICAS message will be displayed and an aural “CONFIG BRAKE” warning
will sound.
Parking Brake Handle
Figure 15-10
Parking Brake Handle
To engage parking brake:
• while fully depressing both brake
pedals on the pilot's or copilot's
side, pull parking brake handle and
rotate it 90° to the locked position.
To disengage parking brake:
• while fully depressing both brake
pedals on the pilot's or copilot's
side, rotate the parking brake
handle to the unlocked position
and push it down.
P604_15_0195_019
PARKING BRAKE
PULL
&
TURN
LANDING GEAR / BRAKES
For Training Purposes Only
May 03
15-19
P I LOT T R A I N I N G GU I D E
Anti-Skid System
The anti-skid system consists of a dual-channel (inboard and outboard) anti-skid
control unit (ASCU), four axle-mounted speed transducers, and four anti-skid control
valves. The anti-skid system independently controls the braking of each main wheel
by modulating the hydraulic pressure applied to each brake.
Rotational speed of each wheel and its rate of deceleration are sensed by the wheel
speed transducers and the data is transmitted to the ASCU. The ASCU modulates the
hydraulic pressure at the brake to prevent wheel lockup.
Comparing the speed of paired wheels provides a second level of anti-skid protection.
The inboard wheels form one pair, the outboard wheels the other. If, for example, the
right inboard wheel rotates at a significantly slower speed than the left inboard, the
ASCU releases the brake on the slower turning wheel. When both paired wheels return
to the same speed, the ASCU reapplies the released brake.
The ARMED switch on the ANTI SKID control panel arms the system when the
parking brake is not engaged and both MLG are down and locked. In air mode, (no
WOW signal), the ASCU configures the anti-skid valves to full brake dump to prevent
wheel lockup at touchdown. The system becomes operational when a 35-knot wheel
spin-up signal is generated or a WOW signal is present after a 5-second delay. The
anti-skid system is functional down to a minimum wheel speed of 10 knots.
Anti-Skid Test
The TEST button on the LDG GEAR control panel initiates a built-in test of the
ASCU and associated components, during which time the A/SKID IN TEST advisory
EICAS message will be displayed. The test can only be performed with the parking
brake off.
Controls and Indicators
The landing gear system provides control of the landing gear, brakes, anti-skid and the
overheat warning systems. Flight deck controls activate normal gear extension and
retraction, emergency gear extension, nosewheel steering, warning horn mute, antiskid
operations and anti-skid test functions.
The EICAS primary page presents indications of landing gear position.
LANDING GEAR / BRAKES
15-20 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Landing Gear Panel
Figure 15-11
MUTED
OFF
TEST
MLG BAY OVHT TEST
OVHT FAIL
UP DN
LDG GEAR
DN LCK
REL
ANTI-SKID
ARMED
NOSE STEER
ARMED
HORN
OFF
P604_15_028
Landing Gear
Handle
Pull out and
raise/lower to select
gear up or down
Mute Horn
Switch/light
Mute Horn Light
Mutes landing gear
warning horn
Illuminates when horn
muted
NOSE STEER
ARMED Switch
Arms the nosewheel
steering system
FAIL Test Switch
Tests MLG bay overheat
failure detection system
OVHT Test Switch
Tests MLG bay overheat
detection system
ANTI-SKID ARMED
Switch
Arms anti-skid system
　
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