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conditions occur:
* You move the AUTO BRAKE select switch to a deceleration
position
* Both air/ground systems in air mode, or two thrust levers at
idle, or one or both air/ground systems in the ground mode
for less than or equal to three seconds
* Valid input from one ADIRU
* No fault in the autobrake system
* No fault in the normal antiskid system
* Normal brake metered pressure less than 750 psi.
When you move the AUTO BRAKE select switch to 1, 2, 3, or
MAX and one or more of the arm conditions is not true, the
select switch stays in the selected position and the AUTO
BRAKE DISARM light comes on.
Landing Application Logic
The autobrake function applies the brakes when these
conditions occur:
* Landing autobrake is armed
* Both thrust levers at idle
* One air/ground system in the ground mode for 0.2 seconds
or more
* Wheel spin-up detection occurs or the spin-up latch sets.
Wheel spin-up detection occurs when one wheel on each main
landing gear increases to 60 kts or greater and the wheel speed
stays above 30 kts.
The spin-up latch sets 3 seconds after the air/ground system is
in the ground mode and the wheel spin-up detection occurs.
The spin-up latch resets when the air/ground system is in the
air mode or the autobrake system is off or in the disarm mode.
When the landing autobrake function applies the brakes, it
energizes the valve relay in the antiskid/autobrake control unit.
This sends power to the solenoid valve and control valve on the
autobrake pressure control module.
While autobrake application occurs, you can change the rate of
deceleration and not disarm the system.
These are the deceleration rates and brake pressures for each
position of the autobrake selector switch:
AUTO BRAKE Select
Switch
Deceleration Rate (ft/sec/
sec)
Pressure (psi)
1 4 1285
2 5 1500
3 7.2 2000
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE FUNCTIONAL DESCRIPTION - LANDING ARM & APPLICATION LOGIC
EFFECTIVITY
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AUTO BRAKE Select
Switch
Deceleration Rate (ft/sec/
sec)
Pressure (psi)
MAX/RTO 14 (> 80 knots) 12 (< 80
knots)
3000
If one or more of the arm conditions are not true while the
autobrakes apply the brakes, the AUTO BRAKE select switch
stays in the selected position and the AUTO BRAKE DISARM
light comes on.
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE FUNCTIONAL DESCRIPTION - LANDING ARM & APPLICATION LOGIC
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-108
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE FUNCTIONAL DESCRIPTION - LANDING ARM & APPLICATION LOGIC
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE FUNCTIONAL DESCRIPTION - LANDING ARM & APPLICATION LOGIC
EFFECTIVITY
GUN ALL 32-42-00
Page 41
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-108
Landing Disarm Logic
The autobrake system releases the landing autobrakes and
disarms the autobrake system when any of these conditions
occur:
* AUTO BRAKE select switch to the OFF position
* One normal metered pressure is more than 750 psi
* One thrust lever advanced out of the idle position after the
airplane is on the ground for more that 3 seconds (before 3
seconds causes brake release with no disarm)
* Speedbrake lever from the UP position to the DOWN position
* Fault in the normal antiskid system
* Fault in the autobrake system
* Input from one ADIRU not valid.
When disarmed, the system sends a signal to the AUTO BRAKE
DISARM light, and the light comes on (except for the first
condition, when you move the AUTO BRAKE select switch to
OFF).
Move the AUTO BRAKE select switch to the OFF position to
make the light not come on.
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE FUNCTIONAL DESCRIPTION - LANDING DISARM LOGIC
EFFECTIVITY
GUN ALL 32-42-00
Page 42
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-109
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE FUNCTIONAL DESCRIPTION - LANDING DISARM LOGIC
ANTISKID/AUTOBRAKE SYSTEM - AUTOBRAKE FUNCTIONAL DESCRIPTION - LANDING DISARM LOGIC
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