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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-513
SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - FAULT HISTORY
SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - FAULT HISTORY
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-513
Ground Tests
GROUND TESTS is one of four main menu items in the SMYD
BITE. In this menu, you can do various tests. These are the
menu selections:
* SELF TEST
* DISCRETE INPUTS
* ARINC 429 INPUTS
* ANALOG INPUTS
* SERVO TEST
* DISPLAY TEST.
To start one of these tests, do these steps:
* Turn ON the SMYD BITE
* In the main menu use the down arrow key to scroll to
GROUND TESTS? and push the YES key
* In GROUND TESTS, you use the up or down arrow keys to
scroll to the ground test that you want.
Self Test
In the SELF TEST menu, you do a test of the SMYD LRU for
internal faults. When you push YES for SELF TEST, the BITE
display shows TEST IN PROGRESS until the test is complete. If
the SMYD passes the 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. Use the MENU key
to return to the EXISTING FAULTS menu to check for faults.
Discrete Inputs
In the DISCRETE INPUTS menu, you monitor the status of these
discretes:
* Air/ground for NLG and MLG
* Flaps up limit switches
* Flight control panel switch positions
* TOGA switch status
* Program pin selections
* Autoslat power availability (PRESENT or MISSING)
* Stick shaker power availability
* Yaw damper power availability.
Push the YES key to see the discrete inputs list, then use the up/
down arrow keys to move through the list.
ARINC 429 Inputs
ARINC 429 INPUTS does a check of the activity status of digital
data inputs for these systems:
* On-side IR bus
* Off-side IR bus
* On-side ADR bus
* CDS DEU bus
* FMC bus
* DFCS MCP bus
* SMYD Cross-channel bus.
SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-514
Push the YES key for each system to see if the digital bus for
that system is ACTIVE or INACTIVE. Use the up and down arrow
keys to move through the list.
Analog Inputs
In the ANALOG INPUTS menu you, do a check of the status of
the data from analog sensors that send data to the SMYDs.
For SMYD 1, you can do a check of these analog sensors:
* Left AOA sensor
* Right flap position transmitter
* LVDT on main rudder PCU.
For SMYD 2, you can do a check of these analog sensors:
* Right AOA sensor
* Left flap position transmitter
* LVDT on standby rudder PCU
* Control wheel position sensor on Capt side.
Push the YES key to select a sensor on the BITE display. Use
the up (previous) or down (next) arrow keys to move through the
list.
Servo Test
In the SERVO TEST menu, you do a test of the yaw damper
components on the rudder PCUs for proper operation, as well
as the interfaces between the components and the SMYDs.
These tests require hydraulic pressure. You do a test of these
components:
* Yaw damper solenoid valve
* Yaw damper EHSV
* Yaw damper actuator
* Yaw damper LVDT.
The SMYD 1 servo test does a test of the primary yaw damper
components and actuator on the main rudder PCU.
The SMYD 2 servo test does a test of the standby yaw damper
components and actuator on the standby rudder PCU.
Display Test
The DISPLAY TEST lets you do a test of the display on the BITE
module mounted on the front of the SMYD. To do a test of the
display, push the YES key when the DISPLAY TEST prompt
shows.
SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
EFFECTIVITY
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Page 63
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-32-00-514
The test takes about 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
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