777 AIRCRAFT MAINTENANCE MANUAL
AIMS -ANALOG INTERFACES
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AIMS -CABINET CHASSIS -1
General
Each cabinet chassis is a rack enclosure. It can hold up to 11 LRMs. Currently, there are eight LRMs installed in the cabinet and three spare slots.
A printed wiring board called the backplane runs the width of the cabinet chassis. This backplane transfers the power and data to each LRMs.
Physical Description
The cabinet chassis has these dimensions:
*
Width = 48 inches
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Depth = 24 inches
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Height = 12 inches.
The cabinet chassis weighs approximately 45 pounds.
With the eight LRMs installed, the AIMS cabinet weighs 146.4 pounds.
The Back of the Cabinet Chassis
In the back of the cabinet chassis, there are three ARINC 650 connectors for each slot. The top two connectors, A and B, are for input and output data. The bottom connector C, is for the interface to the backplane.
In the empty slot, there are load plugs on the bottom connector.
Installation
The cabinet has guide rails on the bottom surface and guide pins at the top and bottom of the rear connector to align the LRMs.
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AIMS -CABINET CHASSIS -1
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AIMS -CABINET CHASSIS -2
The Rear of the Cabinet Chassis
These are the interface connectors on the rear of the cabinet:
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12 connectors for ARINC 629 interface
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2 connectors for video bus data output
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12 connectors for ARINC 429, analog, and analog discrete interface
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3 connectors for power interface
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1 connector for CPM/COMM interface
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1 connector for ARINC 453 weather radar and GPWS
interface.
The airplane power comes into two power supply filters. These filter the power and distribute it on the backplane.
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AIMS -CABINET CHASSIS -2
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AIMS -INPUT/OUTPUT MODULE
General
The input/output module (IOM) supplies the interface between the software functions in the AIMS cabinet and external signal sources. The four IOMs supply most of the standard and shared interfaces necessary to operate the CPMs. The CPM/COMM and the CPM/GG supply some unique input and output interfaces.
Input/Output Modules
The IOM supplies these types of interfaces:
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76 analog discrete inputs
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16 analog discrete outputs
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32 ARINC 429 data bus inputs
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5 ARINC 429 data bus outputs
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3 ARINC 629 data buses
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12 analog inputs
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2 analog outputs.
The IOMs also interface with the backplane data bus, and the backplane power bus to communicate with the software functions in the cabinet.
Physical Description
These are the dimensions of an IOM:
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3.41 inches wide
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15 inches deep (includes the handle assembly)
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7.2 inches high.
The weight of an IOM is 10.6 pounds.
Installation
The IOMs have a hot insertion switch on the rear surface. This insertion switch keeps the cabinet +28v dc from the IOM until it makes positive contact between the IOM ARINC 650 connector and the backplane pins of the cabinet.
The four IOMs have the same keyed connectors. This makes the IOMs interchangeable.
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AIMS -INPUT/OUTPUT MODULE
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AIMS -CORE PROCESSOR MODULES
General
The core processor modules (CPM) supplies the hardware and software for the AIMS functions. These are the four different CPMs:
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