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* Continuous monitoring during normal operation
* Power up tests.
Faults are stored for this number of flight legs:
* Last 64 flight legs
* Maximum of 256 faults.
Only flight legs that have faults show in fault history. The flight
leg changes when the airplane goes from the ground to air
except during touch and go operations when the airspeed
remains above 60 KCAS.
For fault information by flight leg, do these steps:
* Turn on the SMYD BITE
* Use the down arrow key to scroll to FAULT HISTORY?
* When FAULT HISTORY? shows, push the YES key
* Use the up or down arrow keys to scroll to the desired flight
leg and then push the YES key.
More Details
After you select a flight leg with the YES key, the display shows
fault 1 for that flight leg. If you then push the down arrow key, the
display first shows MORE DETAILS? to ask if you want to see
details for fault 1. If you push the YES key, the display shows
details for fault 1. Under MORE DETAILS? if you push NO or the
down arrow key, the display goes to the next fault in that flight
leg.
Under MORE DETAILS? for fault 1 if you say YES, the display
first shows the maintenance message number for fault 1. If you
then push the down arrow key, the display shows these details
for fault 1:
* Flight deck effect(s) (FDE)
* Flight phase when the fault was detected
* The most likely LRU that caused 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 the NO or down arrow keys to
see if there are more faults under the selected flight leg. To see
additional flight legs, push the MENU key to go back to the flight
legs sub-menu.
YDS - TRAINING INFORMATION POINT - SMYD BITE - FAULT HISTORY
EFFECTIVITY
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22-23-00-017
YDS - TRAINING INFORMATION POINT - SMYD BITE - FAULT HISTORY
YDS - TRAINING INFORMATION POINT - SMYD BITE - FAULT HISTORY
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-23-00-017
Ground Tests
GROUND TESTS is one of four main menu items in the SMYD
BITE. On this menu, you can do these functions:
* SMYD LRU self test
* See the status of discrete inputs and analog inputs to the
SMYD
* See the activity status of ARINC 429 inputs
* Servo test of the yaw damper components on the rudder
PCU
* Test of the BITE display.
These are the menu selections:
* 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
* On the main menu, use the down (or up) arrow key to scroll
to GROUND TESTS? and push the YES key
* Use the up or down arrow keys to scroll to the ground test
that you want and push 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. The information under MORE
DETAILS is the same as for the existing faults test that was
discussed previously.
Self Tests
The SELF TEST does a check of the SMYD LRU for internal
faults. When you push YES for self tests, the 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.
Discrete Inputs
You do a check of the status of these discrete inputs from the
DISCRETE INPUTS menu for SMYD 1:
* Air/ground relays
* Flaps Up limit switches
* FLT CONTROL B switch
* Yaw damper engage switch
* TO/GA switches (OPEN or GROUND)
* Program pin selections
* Autoslat power availability (PRESENT or MISSING)
* Stick shaker power availability
* Yaw damper power availability.
Use the up (previous) and down (next) arrow keys to move
through the list of discrete inputs.
YDS - TRAINING INFORMATION POINT - SMYD BITE - GROUND TESTS
EFFECTIVITY
SHZ ALL 22-23-00
Page 36
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
ARINC 429 Test
　
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