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sensors.
System 1 only sends a left gear on ground mode signal to the
flight data acquisition unit (FDAU) when targets move near one
or both left main landing gear compressed sensors.
System 1 also sends a nose gear on ground mode signals to the
flight data acquisition unit (FDAU) when targets move near one
or both nose landing gear compressed sensors.
See the flight data recorder system (FDRS) section for more
information about the FDAU. (SECTION 31-31)
System 1 only sends parking brake set, and on ground signals
to the voice recorder. This lets you erase the voice recorder
when the parking brake is set and the airplane is on the ground.
See the voice recorder system section for more information
about the voice recorder. (SECTION 23-71)
AIR/GROUND SYSTEM - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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System 1 only sends parking brake set, and on ground signals
to the aircraft communications addressing and reporting
system (ACARS) management unit (MU). The ACARS/MU
records this information as the time the airplane is at the gate.
See the ACARS system section for more information about the
ACARS management unit. (SECTION 23-27)
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Signals for system 2 are the same as system 1 except:
* System 2 sends a right gear on ground mode signal to the
FDAU when targets move near one or both right main
landing gear compressed sensors
* System 2 sends nose on ground mode signals to the FDAU in
addition to other airplane systems
* System 2 does not send parking brake set on ground signals.
You can change the output of each air/ground system with the
AIR/GND OVRD function on the PSEU BITE. The air/ground
system in air red lights and PSEU amber light come on when
the system is in the air mode.
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EFFECTIVITY
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General
The PSEU BITE instruction placard has this information:
* Sensor rigging aid
* Instructions
* BITE menu tree
* Warning
* Replace test input cycling sequence.
Sensor Rigging Aid
The sensor rigging aid shows the information for each sensor
when you select SENSOR RIGGING in the OTHER FUNCTNS
menu selection. The rigging aid tells you how to read the
display to see the sensor-to-target gap.
Instructions
The instructions tells you how to operate the switches on the
BITE panel.
BITE Menu Tree
The BITE menu tree shows a list of the first and second levels in
the PSEU BITE menu.
Warning
The warning tells you that these tests in the PSEU BITE can
cause operation of airplane systems:
* LRU replacement test
* Self-test
* Landing gear transfer valve test
* Air/ground override.
Replacement Test Input Cycling Sequence
The replacement test input cycling sequence tells you to
operate these airplane controls and systems during the
replacement test:
* Engine 1 running relay
* Engine 2 running relay
* Nose wheel steering switch
* Speed brake lever
* Right thrust lever
* Left thrust lever
* Parking brake
* Landing gear control lever
* Horn cutout reset switch
* Takeoff warning cutoff circuit breaker
* Forward cargo door warning switch
* Aft cargo door warning switch
* Elect access door warning switch.
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