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The REPLACE TEST does a self-test of the PSEU and a
sequence check of the connections to the PSEU.
SELF TEST
The SELF TEST does a check of the PSEU.
LGTV TEST
The LGTV TEST does a check of the landing gear transfer valve
operation. The test operates the valve for the primary and
secondary circuits in the PSEU and valve. If the inputs are
functioning normally, the fault does not show and the test
passes. If the test fails, the fault message shows in the
EXISTING FAULTS menu.
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SPDBRK TEST
The SPDBRK TEST shows the inputs used to operate the
SPEEDBRAKES EXTENDED amber light in the flight
compartment (except for the air/ground input) that have not
changed during the current flight. To remove the fault, cycle the
input and rerun the test. If the input functions normally, the fault
does not show. If the test fails, the INTERNAL FAULTS message
shows.
T/O WARN TEST
The T/O WARN TEST shows takeoff warning system inputs
(except for stabilizer trim) that have not changed during the
current flight. To remove the fault, cycle the input and rerun the
test. If the input functions normally, the fault does not show. If
the test fails, the INTERNAL FAULTS message shows.
DISPLAY TEST
The DISPLAY TEST shows the BITE display characters in
sequence. This test is not interactive. When the test is complete,
the BITE display shows DISPLAY TEST? again.
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Air/Ground Override
The air/ground override lets you change the output of the air/
ground systems.
To override the output of the air/ground systems, do these
steps:
* Go to the main menu
* Use the up or down arrow switches until you see AIR/GND
OVRD? in the BITE display
* Push the YES switch
* Use the up or down arrow switches until you see the air/
ground system(s) you want to override
* Push the YES switch.
The display shows ARE YOU SURE? Airplane systems may
operate automatically when the air/ground systems change
their output. Obey these warnings when you change the output
of the air/ground systems:
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 PERSON 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.
When you push the YES switch while the ARE YOU SURE?
message shows, the chosen air/ground system changes output.
The PSEU amber light in the flight compartment comes on when
an air/ground system is in the override mode.
The air/ground override does not send a signal to operate the
landing gear lever latch solenoid.
The air/ground system does not change output again until you
override the air/ground system again, or the system changes
from inputs from the compressed sensors.
The RESET OVRD? selection of the air/ground override menu
lets you put all air/ground outputs to their normal mode.
AIR/GROUND SYSTEM - TRAINING INFORMATION POINT - AIR/GND OVRD
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