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system.
SMYD
When a SMYD computer is in the number 2 position it operates
the WTRIS and standby yaw damping. These systems only
operate when in flight control manual reversion mode. This is
when flight control hydraulic system A and B are OFF and the
standby system is ON.
WTRIS - OPERATIONS - ENGAGE INTERLOCKS
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WTRIS - OPERATIONS - ENGAGE INTERLOCKS
WTRIS - OPERATIONS - ENGAGE INTERLOCKS
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General
The SMYD has these BITE functions:
* Continuous monitor
* BITE Tests.
Continuous Monitor
The continuous monitor function of BITE monitors the SMYD
LRU for proper operation. When the SMYD has an internal
failure, a fault is recorded in fault history. Some faults cause the
SMYD to have no outputs for the stall management and yaw
damper functions.
BITE Tests
BITE Tests are used to do tests of components and sensors that
interface with the SMYD. It has these functions:
* Quick system test
* SMYD LRU self test
* Tests of sensors that interface with the SMYD
* Tests to show functions are within specification
* Supports fault isolation.
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 the menu and
move back up one level to the previous menu. One of these
conditions is necessary to start BITE:
* Flaps up and VCAS < 60 knots
* On-side engine N1<15% and off-side engine N2<50%.
These BITE start conditions make sure that if BITE is ON, it will
turn off before takeoff. Also, a time delay turns off the BITE
control panel if no push-buttons are pushed for five minutes or
longer.
Main Menu
These are the four main menu selections in SMYD BITE:
* 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.
WTRIS - TRAINING INFORMATION POINT - SMYD BITE
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WTRIS - TRAINING INFORMATION POINT - SMYD BITE
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WTRIS - TRAINING INFORMATION POINT - SMYD BITE
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Ground Test
GROUND TESTS is one of the four main menu items in the
SMYD BITE. In this menu, you can do these tests:
* SELF TESTS
* 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 (or up) arrow key to scroll to
GROUND TESTS? and press the YES key
* Use the up or down arrow keys to scroll to the ground test
that you want and press the YES key.
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, and provides detailed
information about the fault.
Self Tests
The SELF TEST does a check of the SMYD LRU for internal
faults. When you push YES, the display shows TEST IN
PROGRESS until the test is complete. If the SMYD passes the
　
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