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test, the display shows SMYD LRU OK. If the SMYD does not
pass the test, the display shows SMYD LRU FAIL for 2 seconds,
then shows the first fault.
Discrete Inputs
You do a check of the status of these discrete inputs from the
DISCRETE INPUTS menu.
* Air/ground relays
* Flaps up limit switches
* Flight control panel switches
* Program pin selections
* Yaw damper engage switch
* TO/GA switch status (OPEN or GROUND)
* Autoslat power availability (PRESENT or MISSING)
* Stick shaker power availability
* Yaw damper power availability.
Push the YES key to see the list of discrete inputs. Use the up
(previous) and down (next) arrow keys to move through the list.
ARINC 429 Test
In the ARINC 429 INPUT menu, you can do a check of the activity
status of ARINC 429 buses for these systems:
WTRIS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
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* 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 key to see if the bus is ACTIVE or INACTIVE. Use
the up and down arrow keys to move through the list.
The GROUND TESTS menu only shows whether the data bus for
each system is active or inactive. To observe ARINC 429 data
for these systems, go to the OTHER FUNCTIONS selection in the
main menu.
Analog Inputs
In the ANALOG INPUTS menu, you do a check of the status of
data from analog sensors that send data to the SMYD. For
SMYD 2 (WTRIS and standby yaw damping systems) a check
can be done for these analog sensors:
* Right AOA sensor
* Left flap position transmitter
* LVDT on standby rudder PCU
* Captain control wheel position sensor.
Push the YES key to select an analog sensor. Use the up
(previous) or down (next) arrow keys to move through the list.
Servo Test
In SMYD 2 BITE, you can use the SERVO TEST to do a test of the
yaw damper components on the standby rudder PCU and their
interface with SMYD 2. You do a test of these components:
* Standby yaw damper solenoid valve
* Standby yaw damper EHSV
* Standby 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.
The test takes about 10 seconds. All the LEDs on the left half of
the top line will come on first, then all the LEDs on the right half
will come on. Next all the LEDs on the left half of the bottom line
will come on, then all the LEDs on the right half will come on.
There are eight 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.
Ground Tests Passed
If the ground test that you selected passes the test, the display
shows TEST PASSED. If the test fails, the display shows a fault
message under MORE DETAILS, and provides detailed
information about the fault.
WTRIS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
EFFECTIVITY
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WTRIS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
WTRIS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
EFFECTIVITY
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Ground Tests - Servo Test
Under the GROUND TESTS menu, the SERVO TEST for SMYD 2
does a test of the yaw damper components on the standby
rudder PCU for the WTRIS and standby yaw damping system.
The SERVO TEST consists of these two tests:
* ZERO COMMAND
* SWEEP TEST.
For these tests, standby hydraulic system pressure is
necessary. On the flight control panel, at least one flight
control switch, A or B, must be in STBY RUD and the other flight
control switch may be OFF or STBY RUD.
Before the start of the test, the SMYD 2 BITE provides warnings
about rudder movement and asks you if the rudder area is
clear. The BITE then provides instructions to do the tests.
Zero Command
For the ZERO COMMAND test, SMYD 2 commands the rudder
　
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