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* 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 the display shows a fault description with the
most likely LRU causing the fault. It starts with fault 1. If you
push the down arrow key, the display will ask if you want to see
MORE DETAILS? about the fault. Push YES to see more details
about the fault, or push NO or the down arrow key to go to the
next fault.
More Details
When MORE DETAILS? shows, push the YES key to see the
maintenance message number for the selected fault, then push
the down arrow key to show these fault details:
* Flight deck effect for the fault
* The most likely LRU that caused the fault
* Hard or intermittent fault
* Fault latched or not.
To see the next fault, push the up arrow key (previous) to go
back to MORE DETAILS?, then push NO or the down arrow key
and the display will show the next fault, or END OF LIST if there
are no more faults.
The SMYD 1 BITE interfaces with various airplane sensors to
record faults for these systems:
* Primary yaw damping system
* Stall warning system and elevator feel shift
* Autoslat system
* Display of Performance data on CDS.
The SMYD 2 BITE is similar and is for these systems:
* WTRIS and standby yaw damping system
* Stall warning system and elevator feel shift
* Autoslat system
* Display of Performance data on CDS.
Reset Latches
After display of a fault, if the fault is a latched fault, the display
will ask RESET LATCHES?. Push the YES key to reset the
latched fault and the display will show RESET IN PROGRESS.
SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - EXISTING FAULTS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - EXISTING FAULTS
SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - EXISTING FAULTS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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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 LRU store fault data in NVM during these
conditions:
* System tests with the SMYD BITE
* 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 airspeed stays
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?
* Push the YES key to enter FAULT HISTORY?
* Use the up or down arrow keys to scroll to the desired flight
leg and push the YES key.
More Details
Once 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 will first show MORE DETAILS? to ask if you want to see
details about fault 1. If you push the YES key, the display will
show details for fault 1. Under MORE DETAILS? push the NO
key or down arrow key to go to the next fault in the same flight
leg.
Under MORE DETAILS? for fault 1, if you say YES, the display
will first show the maintenance message number for fault 1. If
you then push the down arrow key, the display will show these
details about fault 1:
* Flight deck effect(s) (FDE)
* Flight phase in which the fault was detected
* The most likely LRU that caused the fault
* Hard or intermittent fault
* Fault latched or not.
To see more faults, push the up arrow key (previous) to go back
to the MORE DETAILS? menu, then push the NO or down arrow
key 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.
SWS - SMYD - TRAINING INFORMATION POINT - SMYD BITE - FAULT HISTORY
EFFECTIVITY
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