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Indicates that brake pressure of the respective
system is less than 1800 psi and DC bus 2 is
powered.
BRT
Brake Pressure Readout
Displays brake pressure of respective system
(in 100 psi increments).
Green -- Between 1800 psi and 3200 psi
White -- Greater than 3200 psi
Amber -- 1800 psi or less
Amber dashes -- Invalid data
Hydraulic Page
Primary Page
Vol. 1 16--40--4
LANDING GEAR
Brake System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
A. Parking Brake
Inboard brake control valves and the parking shutoff valve are used to provide braking
when the aircraft is parked. Pulling the parking brake handle while fully depressing
both rudder pedals and turning the handle 90 degrees in either direction, locks both
brake control valves in the applied position.
When the hydraulic systems are shut down, hydraulic pressure slowly leaks away via
the anti-skid return lines. The parking brake shutoff valve closes when the parking
brake is applied, ensuring that hydraulic system 3 accumulator pressure is maintained
on the inboard brakes for a prolonged period of time.
Parking brake configuration and operational condition are continuously monitored and
any detected fault is displayed on EICAS in the form of a visual and/or aural message.
Parking Brake Controls <1205>
Figure 16---40---3
Parking Brake Handle
Centre Pedestal
PKG BRK ON Light
Indicates that the
parking brake is set.
External Service Panel
Right Forward Fuselage
Vol. 1 16--40--5
LANDING GEAR
Brake System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Parking Brake EICAS Indications <1001>
Figure 16---40---4
PARKING BRAKE
PARK BRAKE SOV
BRAKES
PARKING BRAKE warning (red)
Indicates that the parking brake is set with the
airplane configured for takeoff or in the air.
PARK BRAKE SOV caution (amber)
Indicates that the parking brake shutoff valve
has failed open with inboard brake pressure
greater than 800 psi and the parking brake set.
PARKING BRAKE ON advisory (green)
Indicates that the parking brake is set with the
airplane on the ground, both engines not at
take--off power and inboard brake pressure
greater than 800 psi.
PARKING BRAKE ON
BRT
Status Page
Primary Page
Vol. 1 16--40--6
LANDING GEAR
Brake System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
B. Brake Temperature Monitoring System
The brake temperature monitoring system (BTMS) provides an indication to the crew of
the main wheel brake temperatures. Individual brake temperatures are displayed as a
color coded numerical readout on the status page of the EICAS secondary display.
The brake temperature readout will be displayed when the landing gear and slats/flaps
position indications are being displayed on EICAS primary page. A BTMS overheat
warning reset switch, on the landing gear control panel, is used to reset the system
when the brake overheat condition no longer exists.
BTMS Controls
Figure 16---40---5
BTMS OVHT WARN RESET
Used to reset BTMS. The BTMS
can only be reset if the brake
overheat condition or the brake
temperature difference has
discontinued.
Landing Gear Control Panel
Center Pedestal
Status Page
Vol. 1 16--40--7
LANDING GEAR
Brake System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
BTMS EICAS Indications <1001>
Figure 16---40---6
BRAKE OVHT warning (red)
Indicates an overheat condition
at any one of the brakes.
BRAKES
BRAKE OVHT
Primary Page
BRT
Vol. 1 16--40--8
LANDING GEAR
Brake System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
C. Anti--Skid System
The anti-skid system controls hydraulic pressure to the four main wheel brakes to
provide anti-skid protection. The anti-skid system consists of a dual channel (inboard
wheel control and outboard wheel control) anti-skid control unit (ASCU), four wheel
speed transducers and two dual anti-skid control valves. The anti-skid system performs
the following functions:
S Individual wheel anti-skid control: Prevents skids from developing.
S Touchdown protection: Prevents landing with locked wheels in the event that the
pilot(s) are depressing the brake pedals during touchdown.
S Locked wheel protection: Allows a wheel to recover from a deep skid.
Selecting the anti--skid switch, on the landing gear control panel, to the ARMED
position enables the ASCU (provided the parking brake is not engaged and both main
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