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32-09-00-003
Purpose
The air/ground relays supply air/ground signals to airplane
systems.
Physical Description
The air/ground relays are hermetically sealed units, with a
mounting bracket attached.
Location
The six system 1 air/ground relays are in the J22 junction box.
Five system 2 air/ground relays are in the J20 junction box. One
system 2 air/ground relay is in the J24 junction box.
To get access to these junction boxes, go through the access
panels on the left and right sides of the nose landing gear wheel
well.
Functional Description
This table gives you information about the air/ground relays:
System Relay Junction Box Energized
1 R584 J22 AIR
1 R587 J22 GROUND
1 R589 J22 GROUND
1 R592 J22 GROUND
1 R593 J22 AIR
1 R594 J22 GROUND
System Relay Junction Box Energized
2 R585 J24 AIR
2 R588 J20 AIR
2 R590 J20 GROUND
2 R591 J20 GROUND
2 R595 J20 GROUND
2 R596 J20 GROUND
AIR/GROUND SYSTEM - AIR/GROUND RELAYS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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AIR/GROUND SYSTEM - AIR/GROUND RELAYS
AIR/GROUND SYSTEM - AIR/GROUND RELAYS
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The proximity switch electronics unit (PSEU) controls six
airplane systems and provides air/ground relay and discretre
outputs for multiple airplane systems. The PSEU also provides
fault indication and maintenance BITE.
Location
The PSEU is in the forward equipment compartment. You get
access to the PSEU through the access door on the bottom on
the airplane, forward of the nose landing gear wheel well.
Physical Description
The PSEU is an LRU with two internal circuit cards and a BITE
panel on the front. Two red lights below the BITE panel show if
the air/ground systems are in the air mode. A placard on the
front of the PSEU has instructions to operate the BITE.
The PSEU has these seven electrical connectors:
* J1-J4 are for system 1
* J5-J7 are for system 2.
Functional Description
The PSEU does these functions for the air/ground system:
* Monitors the landing gear compressed sensors
* Operates the air/ground relays
* Sends air/ground discrete signals.
The PSEU processes signals from the air/ground sensors and
sends air/ground signals to airplane systems and air/ground
relays.
The PSEU also does these functions:
* Landing gear position indication and warning
* Landing gear transfer valve control
* Landing gear not down warning
* SPEEDBRAKES EXTENDED amber light control
* Takeoff (aural) warning
* Door warning.
For more information about landing gear position indication and
warning, see the landing gear position indication and warning
system section. (SECTION 32-61)
For more information about the landing gear transfer valve, see
the landing gear control system section. (SECTION 32-31)
For more information about the SPEEDBRAKES EXTENDED
amber light, see the speedbrake control system section.
(SECTION 27-62)
For more information about the door warning, see the door
warning system section. (SECTION 52-71)
AIR/GROUND SYSTEM - PROXIMITY SWITCH ELECTRONICS UNIT
EFFECTIVITY
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AIR/GROUND SYSTEM - PROXIMITY SWITCH ELECTRONICS UNIT
AIR/GROUND SYSTEM - PROXIMITY SWITCH ELECTRONICS UNIT
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Purpose
The proximity switch electronics unit (PSEU) provides air/
ground discrete signal outputs for multiple airplane systems.
General Description
System 1 receives configuration discrete and sensor inputs
from airplane components for use when calculating air/ground
discrete outputs.
These are the multiple use systems/units that use air/ground
discretes from system 1:
* Antiskid/autobrake control unit (AACU)
* Auto speedbrake control module
* Flap/slat electronics unit (FSEU)
　
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