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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
787 Flight Crew Operations Manual
Landing Gear -
System Description
Boeing Proprietary 14.20.5
• 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 electric brake actuators are clamped in position during parking
brake application and require no active power to maintain application. The
parking brake system has a "park and adjust" feature which monitors condition of
the brakes after parking brake application and adjusts 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.
Brake Temperature Indication
Wheel brake temperatures are displayed on the GEAR synoptic display.
Numerical values related to wheel brake temperature are displayed adjacent to
each wheel/brake symbol. These values range from 0.0 to 9.9 in increments of 0.1.
The values tend to increase after the brakes are used.
Normal range values of 0 to 4.9 are white. For values of 3.0 to 4.9, the brake
symbol for the hottest brake becomes solid white. Values of 5.0 and above are
amber. For values of 5.0 and above, the EICAS advisory message BRAKE TEMP
is displayed.
Tire Pressure Indication
Individual tire pressures, from 0 to TBD PSI, are displayed inside each individual
gear indication on the GEAR synoptic. Normal values are depicted in white. Low
tire pressure values are depicted in amber. Value will change to amber when the
value is less than minimum threshold. The threshold value is TBD.
787 Flight Crew Operations Manual
Landing Gear -
System Description
14.20.6 Boeing Proprietary
The EICAS advisory message TIRE PRESS is displayed if any tire pressure is
above or below normal range, or there is an excessive pressure difference between
two tires on the same axle.
787 Flight Crew Operations Manual
Landing Gear Chapter 14
EICAS Messages Section 30
Boeing Proprietary 14.30.1
14.30 Landing Gear-EICAS Messages Landing Gear EICAS Messages
The following EICAS messages can be displayed.
Note: Configuration warning messages are covered in Chapter 15, Warning
Systems.
Brakes
Landing Gear
Message Level Aural Condition
ANTISKID Advisory A fault is detected in the antiskid system.
AUTOBRAKE Advisory Autobrake is disarmed or inoperative.
BRAKE PEDALS
CAPT, F/O
Caution One or both brake pedals are inoperative for
the affected crewmember.
BRAKE TEMP Advisory Temperature of one or more brakes is
excessive.
BRAKES Advisory Two or more wheel brakes are inoperative.
TIRE PRESS Advisory Tire pressures are not normal.
Message Level Aural Condition
GEAR DISAGREE Caution Beeper Gear position disagrees with landing gear
lever position.
GEAR DOOR Advisory One or more gear doors are not closed.
GEAR DRAG
BRACE L, R
Caution Affected main gear is down with side brace
locked and drag brace unlocked.
GEAR SIDE
BRACE L, R
Caution Affected main gear is down with drag brace
locked and side brace unlocked.
NOSE WHEEL
STEERING
Advisory Nose wheel steering is not available.
TILLER L, R Caution Tiller is inoperative on the affected side.
787 Flight Crew Operations Manual
　
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