*
Electrical load management system (ELMS)

*
Brake sytem control unit (BSCU)

*
Warning electronic unit (WEU)

*
Cabin system management unit (CSMU)

*
Audio management unit (AMU)

*
Cargo smoke detection system (CSDS).

These components in the left and right system card files get PSEU data through the ARINC signal gateway (ASG) cards:
*
Weight on wheels (WOW) cards

*
Hydraulic interface module (HYDIM) cards

*
Environmental control system miscellaneous cards (ECSMC).

The PSEUs supply data through hardwire discretes to these systems:
*
ELMS

*
Traffic alert and collision avoidance system (TCAS)

*
AIMS

*
ECC (equipment cooling controller)

*
Cargo handling access panels.

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PROXIMITY SENSOR SYSTEM -GENERAL DESCRIPTION

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PROXIMITY SENSOR SYSTEM -PROXIMITY SENSORS

Purpose
The proximity sensors get position input of airplane components. They supply this position data to the PSEUs.
Physical Description
There are two types of sensors:
*
Flange mount

*
Thread mount.

Both types of sensors are inductance-type sensors.
There are approximately 96 sensors on the airplane.
Functional Description
The PSEU sends a signal to energize the magnetic core in the sensor. The inductance of the sensor changes when a steel target gets near the sensor.
The flange mount sensors send a near signal when the target is
0.24 inches (6.1 mm) from the sensor (head-on). They send a far signal when the target is 0.3 inches (7.6 mm) from the sensor (head-on).
The thread mount sensors send a near signal when the target is
0.085 inches (2.2 mm) from the sensor (head-on). They send a far signal when the target is 0.12 inches (3.1 mm) from the sensor (head-on).
Training Information Point
The targets are made of corrosion-resistant steel. Standard target sizes are 0.05 inches (1.3 mm) thick and either 1.25 inches (31.7 mm) or 0.75 inches (19 mm) in diameter.
Some proximity sensors use non-standard targets. For example, sensors for the cargo doors and passenger entry doors use door structure for the targets.
Correct sensor-target gap is important for correct PSS operation.
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PROXIMITY SENSOR SYSTEM -PROXIMITY SENSORS

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PROXIMITY SENSOR SYSTEM -PSEU -COMPONENT LOCATION

Purpose
The PSEUs are the central components of the proximity sensor system. They get proximity sensor input and other discrete signals. The PSEUs process this data and send control and indication signals to other airplane systems.
Location
The PSEUs are in the main equipment center. PSEU 1 is on the E1-5 shelf. PSEU 2 is on the E4-1 shelf.
Training Information Point
The PSEUs are electrostatic discharge sensitive devices.
CAUTION:  DO NOT TOUCH THE PSEU BEFORE YOU DO THE PROCEDURE FOR DEVICES THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE PSEU.
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PROXIMITY SENSOR SYSTEM -PSEU -COMPONENT LOCATION

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PROXIMITY SENSOR SYSTEM -PSEU -CIRCUIT CARDS

General
PSEU 1 contains 13 circuit cards and PSEU 2 contains 11 circuit cards.
These are the 5 different types of circuit cards:
*
Microprocessor cards

*
Proximity cards

*
Driver cards

*
Communication cards

*
Power supply cards

Microprocessor Card
There are two microprocessor cards in each PSEU. These cards control the operation of the PSEU. They also supply BITE functions.
The microprocessor cards are interchangeable.
Proximity Card
Each proximity card has 24 channels. Each channel controls the power to a proximity sensor and calculates the near or far condition. PSEU 1 has three proximity cards and PSEU 2 has four proximity cards.
The proximity cards are interchangeable.
Driver Card
There are three different types of driver cards. Two of these types have 18 channels and one has 10 channels. The driver cards contain the driver outputs of the PSEUs. The driver cards also supply some logic functions. PSEU 1 has three driver cards and PSEU 2 has one driver card.
　
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