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PRIMARY DISPLAY SYSTEM -EICAS AND MFD FUNCTIONAL DESCRIPTION
General
Each AIMS cabinet has four input/output modules (IOMs) and two core processor/graphic generators (CPM/GGs). Each graphic generator has an output to the display units (DUs). The EICAS and MFD functions in the CPM/GGs independently process their formats. The EICAS function has these sub-functions:
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Solution logic
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EICAS display generator.
The MFD function has these sub-functions:
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System fault reports
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Determine dispatch status
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MFD display generator.
Both functions send data to the graphic generator sub-function. The graphic generator reformats and sends this data to the DUs.
IOMs
Each IOM does these functions:
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Presence and validity checks
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Source select and filtering.
The IOM modules do presence and validity checks on all display input parameters. Data updates at specified frequencies make sure that the information the flight crews see is current.
EFFECTIVITY
BEJ ALL
Each IOM removes bad data, replaces it with a good source, and filters the change from bad to a good data source. The IOM sends, in critical cases, messages to alert the flight crew of a failure. The IOMs send the valid and message data to the EICAS and MFD functions through the backplane bus.
CPM/GGs
Each CPM/GG also has an EICAS and MFD function with sub-functions. Each AIMS cabinet has two CPM/GGs for a total of four on the aircraft. Each CPM/GG can drive any three display units or three out of four display formats (EICAS, MFD, PFD, or ND). The PFD and ND functions configure and format the PFD and ND displays. The outboard DU location is for PFD display only. This redundant system supplies fail operational capability and allows deferred airplane maintenance.
The sub-functions in the CPM/GGs decode switch inputs and make the appropriate displays. Additional switch positions determine format location. If the upper center DU fails, the lower center DU changes to the upper center DU format.
EICAS Function-Solution logic
The solution logic sub-function receives display and switch input data from the IOMs. The solution logic sub-function determines which of these formats to select:
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EICAS display
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Compacted engine
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Secondary engine.
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PRIMARY DISPLAY SYSTEM -EICAS AND MFD FUNCTIONAL DESCRIPTION
The solution logic use the DSP DU and ENGINE push-button selection along with DU failure status to change between the EICAS display and compacted engine formats. A second push of the DSP ENGINE switch causes the MFD to show the secondary engine format.
The solution logic sub-function sends the display data to the EICAS display function. A failure of the lower DU also causes the solution logic to send compacted engine set logic along with display outputs to the EICAS display sub-function.
EICAS Function-EICAS Display
The EICAS display sub-function use the solution logic inputs and display data to select the correct format(s) and display data. The EICAS and/or secondary formats go to the EICAS display generation block.
EICAS Function-EICAS Display Generation
The EICAS display generation sub-function reformats the display data for the graphics generator.
EICAS/ Function -MFD Graphics Generator
The graphics generator sub-function changes the EICAS display data to graphics on a vector format and sends it to the displays through a coaxial-cable. DU switch inputs from the display switching panels determine when an EICAS display shows in more than one location.
MFD Function -System Fault Reports
The system fault reports sub-function receive faults, sort and order the faults by time of occurrence. It sends this data to the determine dispatch status sub-function.
MFD Function -Determine Dispatch Status
The determine dispatch status sub-function use the fault report data and an airworthiness table to determine the airplane dispatch status. It sends this data to the MFD display generator.
MFD Function -MFD Display Generator
The MFD display generator sub-function use the airplane status data, display selection, and real time status inputs to properly format displays. The display generator use this data along with the maintenance page control and output device selection inputs for proper page display and correct DU location. These inputs permit the MFD display to show synoptics and maintenance formats.
It also use the switch data for automatic lower DU selection to an EICAS format in case the upper DU fails.
The graphics generator sub-function changes the display data to a video format and sends it to the DUs through a coaxial-cable. DU switch inputs from the display switching panels determine when a MFD display shows in more than one location.
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