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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
General
The antiskid card has these functions:
* Skid control
* Locked wheel protection
* Touchdown protection
* Touchdown/hydroplane protection
* Gear retract braking inhibit.
Skid Control
Skid control compares the calculated wheel speed velocity with
a velocity model to control wheel deceleration. If a wheel slows
down too quickly, the skid control releases brake pressure until
the wheel speed increases.
Skid control does not operate at less than a speed of eight
knots.
During normal antiskid operation, the skid control operates for
each wheel. During alternate antiskid operation, the skid control
operates for both wheels on one main landing gear.
Locked Wheel Protection
Locked wheel protection compares the wheel speeds of the two
outboard or the two inboard pair of wheels.
If the slower wheel speed decreases to less than 30 percent of
the faster wheel speed, the locked wheel protection releases
brake pressure from the slower wheel. Locked wheel protection
does not operate at a speed less than 25 knots.
Touchdown Protection
The touchdown protection releases brake pressure from
wheels 2 and 4 while the airplane is in the air and remains
active until 0.7 seconds after the corresponding wheel spins up
to 70 knots, or when the ground mode has been sensed
continuously for three (3) seconds. The PSEU supplies the air or
ground signals to the AACU, (system 1 for wheel 2 and system 2
for wheel 4).
Touchdown/Hydroplane Protection
The touchdown/hydroplane protection compares wheel speed
data to ADIRU ground speed data. When the wheel speed
decreases to 50 knots less than ground speed, the touchdown/
hydroplane protection releases pressure to the brake. The
hydroplane function supplies protection to wheels 1 and 3 only.
Gear Retract Inhibit
To permit gear retract braking, the antiskid system stops
alternate antiskid operation during landing gear retraction. This
occurs during the 12.5 seconds after the landing gear lever
moves to the UP position.
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID FUNCTIONAL DESCRIPTION - ANTISKID CONTROL - 2
EFFECTIVITY
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Page 31
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-008
This permits gear retract braking to stop the wheels during
landing gear retraction without antiskid brake release.
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID FUNCTIONAL DESCRIPTION - ANTISKID CONTROL - 2
EFFECTIVITY
GUN ALL 32-42-00
Page 32
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-008
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID FUNCTIONAL DESCRIPTION - ANTISKID CONTROL - 2
ANTISKID/AUTOBRAKE SYSTEM - ANTISKID FUNCTIONAL DESCRIPTION - ANTISKID CONTROL - 2
EFFECTIVITY
GUN ALL 32-42-00
Page 33
D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-008
General
The BITE card in the antiskid/autobrake control unit (AACU)
sends fault signals through relays to the flight compartment.
Fault Indication
The amber ANTISKID INOP light comes on if there is a fault. The
light can get a ground from one of these antiskid sense relays:
* Outboard
* Inboard
* Alternate.
When the BITE card in the AACU finds a fault in the normal
inboard or normal outboard antiskid, it removes the ground
from the related sense relay. The sense relay deenergizes,
which sends a ground to make the amber ANTISKID INOP light
come on. The alternate antiskid sense relay is enabled when
pressure is sensed at the alternate brake selector valve
pressure switch.
The alternate brake selector valve pressure switch also sends
signals to the flight data aquisition unit (FDAU).
See the flight data recording system (FDRS) section for more
information about the FDAU. (SECTION 31-31)
The amber ANTISKID INOP light comes on for these conditions:
* Inboard or outboard antiskid card fault
* Inboard or outboard antiskid power fault
* One or more normal antiskid valve faults
* Speed switch fault (high wheel speed in air)
* One or more transducer faults
* Parking brake lever and parking brake shutoff valve
disagree
* Display test active.
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