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symmetrical and anti-skid is available at the working brakes.
Two brake wear indicator pins are installed on each brake assembly, to provide a visual indication
of brake wear. When the end of the wear indicator pin is flush with the top of the indicator housing,
the brakes should be serviced.
NOTE
The brake wear indicator pins must be checked with the brakes applied
and hydraulic systems 2 and 3 pressurized.
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−17
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WHEELS AND BRAKES (CONT'D)
Brakes and Lower Main Gear Structure
Figure 15−10−8
Hydraulic Synoptic Page (Inboard and Outboard Brake Pressure)
Figure 15−10−9
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−18
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WHEELS AND BRAKES (CONT'D)
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 brake 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 management 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 a “CONFIG BRAKE” aural warning will sound.
Parking Brake Handle
Figure 15−10−10
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
transducer, 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 valve 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 W0W
signal is present after a 5-second delay. The anti-skid system is functional down to a minimum
wheel spin of 10 knots.
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−19
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
WHEELS AND BRAKES (CONT'D)
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 system. Flight deck controls activate normal gear extension and retraction, emergency gear
extension, nosewheel steering, warning horn mute, anti-skid operations, and anti-skid test functions.
The EICAS primary page presents indications of landing gear position.
Landing Gear Panel
Figure 15−10−11
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−20
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
CONTROLS AND INDICATORS (CONT'D)
Landing Gear Manual Release
Figure 15−10−12
Landing Gear EICAS Displays
Figure 15−10−13
LANDING GEAR/BRAKES
Description
Vol. 2 15−10−21
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
EICAS MESSAGES
MESSAGE MEANING
AURAL WARNING
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庞巴迪挑战者604操作手册 Operating Manual 4(52)
