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The BITE module on the front of the SMYD LRU has a keypad
with six push-buttons, and a two-line display with eight
characters per line.
BITE Operation
To start the BITE, push the ON/OFF key on the BITE module.
EXISTING FAULTS? shows as the first menu item. Push the YES
key to answer questions and to move down further in the
selected menu item on the display. Push the NO or down arrow
key to see the next menu item. In some lists, TOP OF LIST or
END OF LIST shows for one second when you move to the top
or bottom of the list. Push the MENU key to exit a menu and
move back up one level to the previous menu. One of these
conditions are necessary to start BITE:
* Flaps Up and VCAS < 60 knots
* On-side engine N1<15% and off-side engine N2<50%.
These conditions make sure that if BITE is ON, it will turn off
prior to takeoff. Also, a time delay will turn off the BITE control
panel if no push-buttons are pushed for five minutes or longer.
Main Menu
These are the BITE main menu selections:
* EXISTING FAULTS
* FAULTS HISTORY
* GROUND TESTS
* OTHER FUNCTIONS.
At the start of the BITE, EXISTING FAULTS? shows. Push the
YES key to select this menu or use the NO or down arrow key to
go to the next main menu selection.
YDS - TRAINING INFORMATION POINT - SMYD BITE
EFFECTIVITY
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YDS - TRAINING INFORMATION POINT - SMYD BITE
YDS - TRAINING INFORMATION POINT - SMYD BITE
EFFECTIVITY
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Existing Faults
The EXISTING FAULTS test checks the interfaces between the
SMYD and airplane sensors to checks for current faults. To do
the existing faults test, do these steps:
* Turn ON the SMYD BITE
* EXISTING FAULTS? shows as the first menu item
* Push the YES key to enter EXISTING FAULTS.
When you push the YES key for EXISTING FAULTS, the SMYD
BITE will do a check for current faults. If there are no faults, the
display shows NO FAULTS.
If there are faults either for yaw damping or stall management
functions, the the fault description starts with fault 1. If you then
push the down arrow key, the display will ask if you want to see
MORE DETAILS? about the fault. You can push YES to see more
details for the fault. Or you can push NO or the down arrow key
to go to the next fault.
More Details
If you push the YES key when MORE DETAILS? shows, it will
show the maintenance message number for fault 1. You can
then push the down arrow key to show thesedetails for the fault:
* Flight deck effect(s) for the fault
* Flight phase in which the fault was detected
* The most likely LRU causing the fault
* Hard or intermittent fault and if it is latched.
To see more faults, push the up arrow key (previous) to go back
to MORE DETAILS?, then push NO or the down arrow key (next)
to see if there are more faults.
The BITE for SMYD 1 interfaces with various airplane sensors to
record faults for the stall management and primary yaw damper
functions for these systems:
* Primary yaw damping system
* Stall Warning System
* Autoslat system
* Performance data.
Reset Latches
After the display of the last fault, the display asks RESET
LATCHES?. Only some faults will latch. To reset, push the YES
switch. The display shows RESET IN PROGRESS while it resets
the latched faults.
YDS - TRAINING INFORMATION POINT - SMYD BITE - EXISTING FAULTS
EFFECTIVITY
SHZ ALL 22-23-00
Page 32
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-016
YDS - TRAINING INFORMATION POINT - SMYD BITE - EXISTING FAULTS
YDS - TRAINING INFORMATION POINT - SMYD BITE - EXISTING FAULTS
EFFECTIVITY
SHZ ALL 22-23-00
Page 33
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-016
Fault History
The fault history selection in the SMYD BITE shows fault
information by flight leg stored in non-volatile memory (NVM).
Monitors in the SMYD store fault data in NVM during these
conditions:
* System tests using the SMYD BITE
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