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related to the fault.
The existing faults test also lets you reset latches in the PSEU
when the fault is corrected.
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Fault History
The fault history selection shows fault information that is in the
non-volatile memory (NVM) in the PSEU. Monitors in the PSEU
put data in the NVM during these conditions:
* System tests with the PSEU BITE
* Continuous monitoring
* Power up tests.
The NVM keeps data for the last 64 flight legs or a maximum of
256 failures. Flight leg 0 is the current flight leg. Flight leg 63 is
the last leg. Faults in flight leg 0 are faults that occurred during
the most recent flight and the faults that occurred on the ground
after the most recent flight. The flight leg starts when the
airplane goes from the ground to the air and the N2 engine
speed signal shows engine number one operates.
To find fault information from a specific flight leg, do these
steps:
* Go to the main menu
* Use the up or down arrow switches until you see FAULT
HISTORY? in the BITE display
* Push the YES switch
* Use the up or down arrow switches until you see the flight
leg that you want
* Push the YES switch.
The information for MORE DETAILS shows the phase when the
fault occurred (air or ground), and the type of the fault.
The fault types are HARD, INTRMTNT, or REPEATnn:
* HARD faults are faults not cleared prior to the end of last
flight leg
* INTRMTNT faults are faults cleared prior to the end of the last
flight leg
* REPEATnn faults are intermittent faults that occurred nn
times during the last flight leg.
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Ground Tests
These are the ground tests in the PSEU BITE:
* REPLACE TEST
* SELF TEST
* LGTV TEST
* SBRK TEST
* T/O WARN TEST
* DISPLAY TEST.
To start one of these tests, do these steps:
* Go to the main menu
* Use the up or down arrow switches until you see GROUND
TESTS? in the BITE display
* Push the YES switch
* Use the up or down arrow switches until you see the test that
you want
* Push the YES switch.
During the test, the display shows TEST IN PROGRESS. If the
test passes, the display shows TEST PASSED. If the test fails,
the display shows a fault message. The information for MORE
DETAILS? is the same as for the existing faults test.
During the REPLACE TEST and SELF TEST, some outputs from
the PSEU change. Airplane systems may operate automatically
because the air/ground systems send air mode signals during
the tests. Obey these warnings when you do the REPLACE
TEST and SELF TEST:
WARNING: OBEY THE PROCEDURE THAT PREPARES TO PUT
THE AIRPLANE IN THE AIR MODE. IN THE AIR
MODE, MANY OF THE AIRPLANE SYSTEMS CAN
OPERATE. THIS CAN CAUSE INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT CAN
OCCUR.
WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE
FLIGHT CONTROL SURFACES. THESE
COMPONENTS CAN MOVE SUDDENLY WHEN
YOU PUT THE AIRPLANE IN THE AIR MODE.
THIS CAN CAUSE INJURIES TO PERSONS AND
DAMAGE TO EQUIPMENT.
REPLACE TEST
　
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