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Display Test
Move the PRESS/TEST/BIT switch to the PRESS/TEST position
to start the display test. Four sections of the message display
come on for 2.5 seconds, then the other four come on for 2.5
seconds. Each section of the 8-character message display
shows one character. During the display test, the ANTISKID
INOP and AUTO BRAKE DISARM amber lights in the flight
compartment come on for 5 seconds.
BIT Memory Recall Test
The AACU continuously monitors the antiskid and autobrake
systems. If faults are found, the AACU keeps the fault data in the
BIT memory. Move the PRESS/TEST/BIT switch to the BIT
position to show fault messages kept by the AACU. Move the
switch to the BIT position for each fault shown until the message
TEST END shows in the message display.
Antiskid/Autobrake Control Test
The control test does a complete system electrical test. You do
the test with the rotary switch in the NORM position. Then move
these switches to start the test:
* AUTO BRAKE select switch (in flight compartment) to 1, 2, 3,
MAX, or RTO
* Push and hold the ENABLE/VERIFY switch
* Push the VERIFY switch
* Release the two switches.
During the test, the message WAIT flashes in the message
display. If there are no faults, the message TEST END shows in
the message display. If the control test finds a fault, the fault
message shows in the message display. Push the VERIFY
switch to see other faults. When the control test finds that there
are no more faults, the message TEST END shows in the
message display.
ANTISKID/AUTOBRAKE SYSTEM - TRAINING INFORMATION POINT - AACU BITE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-010
Normal Antiskid Brake Test
The normal antiskid brake test sends signals equivalent to a
wheel skid to the normal antiskid valves. To prepare for the test,
operate hydraulic system B to supply pressure to the normal
brake system and hold the brakes in the applied position. Do the
normal antiskid valve tests one at a time in positions 1 through 4
on the rotary switch.
Use these switches to start the test:
* Push and hold the ENABLE/VERIFY switch
* Push the VERIFY switch
* Release the two switches.
The message display of the AACU shows the position of the
brake you do the test on. If there are no faults, the selected
brake will release and then receive pressure again. If there are
faults, the fault message shows in the message display and the
brake does not release and then receive pressure again.
The normal antiskid brake test will be aborted/rejected when
both air/ground signals from the PSEU are in the air mode.
Alternate Antiskid Brake Test
You do the alternate antiskid brake test the same as the normal
antiskid brake test except for these conditions:
* Hydraulic system B does not supply pressure
* Hydraulic system A does supply pressure
* The two brakes on a main landing gear release.
Autobrake Application Test
The autobrake application test sends signals equivalent to an
autobrake application to the autobrake pressure control
module. Operate hydraulic system B to supply pressure to the
normal brake system. Move the rotary switch to the A/B position
to select the test. You will do the test for each position 1, 2, 3,
MAX, and RTO on the AUTO BRAKE select switch.
Use these switches to start the test:
* Push and hold the ENABLE/VERIFY switch
* Push the VERIFY switch
* Release the two switches.
If there are no faults, all brakes receive pressure for 10
seconds. The position of the autobrake selector shows on the
message display of the AACU.
If there are faults, the fault message shows in the message
display and the brakes do not receive pressure. At test
complete, the autobrake system disarms and the AUTO
BRAKE DISARM light comes on.
The RTO application test will be aborted/rejected when both air/
ground signals from the PSEU are in the air mode.
ANTISKID/AUTOBRAKE SYSTEM - TRAINING INFORMATION POINT - AACU BITE
EFFECTIVITY
GUN ALL 32-42-00
Page 49
D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
32-42-00-010
Wheel Speed Signal Test
The AACU sends signals to the auto speedbrake system when
each wheel speed increases more than 60 knots. This occurs
during the normal and alternate antiskid brake tests.
The wheel speed signal test sends the more than 60 knot wheel
　
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