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of the autobrakes.
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE SHUTTLE VALVES
EFFECTIVITY
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ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE SHUTTLE VALVES
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE SHUTTLE VALVES
EFFECTIVITY
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Purpose
The AUTO BRAKE select switch lets the pilots select a landing
autobrake deceleration rate, or autobrake operation if a
rejected takeoff occurs.
The AUTO BRAKE DISARM amber light shows that there is a
disarm condition in the autobrake system.
Location
The AUTO BRAKE select switch is on the P2 center instrument
panel above the upper center display unit.
The AUTO BRAKE DISARM light is above the AUTO BRAKE
select switch.
Functional Description
The AUTO BRAKE select switch is a six position selector switch.
Positions 1 through MAX command the rate of deceleration for
autobrake operation after an airplane lands. You must pull on
the select switch to move it to the MAX position.
The RTO position commands maximum brake pressure when
the pilot does a rejected takeoff.
When the AUTO BRAKE select switch is in the 1, 2, 3, or MAX
position, the AUTO BRAKE DISARM amber light comes on for
these conditions:
* Landing disarm logic true
* RTO turn on self check
* RTO disarm logic true when RTO autobrakes have been
applied
* Within 1.4 seconds after touchdown if the selector was in the
RTO position since takeoff
* RTO autobrake commanded to apply and the autobrake
solenoid valve pressure is low.
The AUTO BRAKE DISARM amber light also comes on when
the AUTO BRAKE select switch is in the OFF position and the
solenoid valve pressure increases more than 1000 psi.
Move the AUTO BRAKE select switch to the OFF position to turn
the AUTO BRAKE DISARM amber light off.
ANTISKID/AUTOBRAKE SYSTEM - CONTROLS AND INDICATIONS
EFFECTIVITY
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ANTISKID/AUTOBRAKE SYSTEM - CONTROLS AND INDICATIONS
ANTISKID/AUTOBRAKE SYSTEM - CONTROLS AND INDICATIONS
EFFECTIVITY
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General
Two antiskid cards supply antiskid control. One antiskid card
supplies the antiskid function for the outboard wheels and the
other antiskid card supplies the antiskid function for the inboard
wheels.
Each antiskid card gets wheel speed signals from two
transducers. The left ADIRU sends a ground speed signal to
the outboard antiskid card. The right ADIRU sends a ground
speed signal to the inboard antiskid card.
Each antiskid card controls two normal and one alternate valve.
The normal and alternate valves get commands at the same
time.
Normal Antiskid
When a skid condition occurs, the antiskid system sends a
signal from the normal valve driver on the antiskid card to the
normal antiskid valve.
Alternate Antiskid
The signals sent to both normal valve drivers also go to the
alternate valve driver for those two wheels. The alternate valve
driver then sends the higher of the two signals to the alternate
antiskid valve.
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID FUNCTIONAL DESCRIPTION - ANTISKID CONTROL - 1
EFFECTIVITY
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ANTISKID/AUTOBRAKE SYSTEM - ANTISKID FUNCTIONAL DESCRIPTION - ANTISKID CONTROL - 1
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID FUNCTIONAL DESCRIPTION - ANTISKID CONTROL - 1
EFFECTIVITY
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