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On the ARINC 429 INPUT menu, you can do a check of the
activity status of these ARINC 429 buses:
* On-side IR bus
* Off-side IR bus
* On-side ADR bus
* CDS DEU bus
* FMC bus
* DFCS MCP bus
* SMYD Cross-channel bus.
Push the YES switch to see if the bus is ACTIVE or INACTIVE.
Use the up and down arrow keys to move through the list.
Analog Inputs
On the ANALOG INPUTS menu, you do a check of the status of
data from analog sensors that send data to the SMYDs. For
SMYD 1, you can do a check of these analog sensors for
primary yaw damping:
* Left AOA sensor
* Right flap position transmitter
* LVDT on main rudder PCU.
Push the YES switch to select a sensor. Use the up (previous) or
down (next) arrow keys to move through the list.
Servo Test
With the SERVO TEST you do a test of the yaw damper
components on the rudder PCUs and the interfaces between the
SMYDs and the rudder PCUs. The SMYD 1 BITE does a test of
these primary yaw damper components on the main rudder
PCU:
* Yaw damper solenoid valve
* Yaw damper EHSV
* Yaw damper LVDT.
Display Test
The DISPLAY TEST lets you do a test of the display on the BITE
module on the front of the SMYD. To do a test of the display,
push the YES key when the DISPLAY TEST prompt shows.
This test takes 10 seconds. All the LEDs on the left half of the top
line come on first, then all the LEDs on the right half come on.
Next, all the LEDs on the left half of the bottom line come on,
then all the LEDs on the right half come on. There are eight
alphanumeric characters on each of the two lines. When the test
is complete, DISPLAY TEST? shows on the display. Push the
MENU key to return to the previous menu.
YDS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-018
Ground Tests Passed
If the ground test that you selected passes, the display shows
TEST PASSED. If the test fails, the display shows a fault
message under MORE DETAILS. The information under MORE
DETAILS is the same as for the existing faults test that were
discussed in a previous section.
YDS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
EFFECTIVITY
SHZ ALL 22-23-00
Page 38
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-018
YDS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
YDS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
EFFECTIVITY
SHZ ALL 22-23-00
Page 39
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-018
Ground Tests - Servo Test
Under the GROUND TESTS menu, the SMYD 1 SERVO TEST
does a test of the yaw damper components on the main rudder
PCU for the primary yaw damping system. The SERVO TEST
consists of these two tests:
* ZERO COMMAND
* SWEEP TEST.
For these tests, hydraulic system B pressure is necessary and
the flight control system B switch on the flight control panel
must be ON.
The BITE provides the instructions to do these tests. BITE
provides warnings about rudder movement and asks you to
make sure the rudder area is clear of equipment and personnel
before you start the test.
Zero Command
For the ZERO COMMAND test, the SMYD commands the rudder
to move to the zero position. SMYD 1 then compares its
commanded value to the value from the LVDT on the main
rudder PCU for rudder position. BITE shows the LVDT values in
degrees.
Sweep Test
For the SWEEP TEST, SMYD 1 commands the main rudder PCU
to move the rudder left, right, and then to the zero position.
During this test, rudder travel is limited to 2 degrees with flaps
up, and 3 degrees with flaps down.
During the sweep test, the SMYD 1 servo command is
compared to the LVDT value from the main rudder PCU to
see if the rudder moves the commanded value. Rudder
movement shows on the SMYD BITE display in degrees of
rudder travel, and on the yaw damper indicator in the flight
deck.
If the test passes, the display shows TEST PASSED. Push the
MENU key to go to the previous sub-menu, SERVO TEST. If the
test fails, the display shows TEST FAILED and then shows the
first fault. Push the down arrow key and the display asks if you
　
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