787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Landing Gear -
System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 14.20.5
Autobrake application occurs slightly after main gear touchdown. If MAX AUTO
is selected, deceleration is limited to the AUTOBRAKE 4 level until pitch angle
is less than one degree, then deceleration is increased to the MAX AUTO level.
The deceleration level can be changed (without disarming the system) by rotating
the selector.
To maintain the selected airplane deceleration rate, autobrake pressure is reduced
as other controls, such as thrust reversers and spoilers, contribute to total
deceleration. The system provides braking to a complete stop or until it is
disarmed.
Autobrake – Disarm
The autobrake system disarms and the EICAS advisory message AUTOBRAKE
is displayed if any of the following occur:
• pedal braking applied
• either thrust lever advanced after landing
• speedbrake lever is moved to the DOWN detent after the speedbrakes have
deployed on the ground
• DISARM or OFF position selected on the AUTOBRAKE selector
• autobrake fault
• normal antiskid system fault
• loss of inertial data from the Inertial Reference Units (IRUs)
When the autobrake system disarms after landing, the AUTOBRAKE selector
automatically moves to the DISARM position, and removes power from the
autobrake system.
When the autobrake system disarms during takeoff, the AUTOBRAKE selector
remains in the RTO position, but automatically moves to OFF after takeoff.
Parking Brake
The parking brake is set by fully depressing both brake pedals, pulling the parking
brake lever up, then releasing the pedals.
The parking brake electric actuators are clamped in position during parking brake
application and require no active power to maintain the clamping force. The
parking brake system has a "park and adjust" feature which monitors the condition
of the brakes after application and adjusts the clamping force as needed during
brake cooling.
The parking brake is released by depressing the pedals until the parking brake
lever releases.
When the parking brake is set, the EICAS memo message PARKING BRAKE
SET is displayed. If the parking brake is set and either engine is set to takeoff
thrust, the takeoff configuration aural alert sounds and the EICAS warning
message CONFIG PARKING BRAKE is displayed.
February 15, 2010
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