*
Estimated time of arrival (ETA) to the waypoint
*
Distance to the waypoint.
The active waypoint on the route is magenta.
Only TCAS traffic data messages show in the plan mode.
TCAS status information shows below the WXR data field to indicate TCAS selection. Information is TA ONLY (TCAS is not computing RA) or TCAS TEST (TCAS is in the test mode).
The alternate navigation source, CDU L, CDU C, or CDU R shows if the active FMCF(s) fail(s) in the lower left corner next to the navigation aid information
Alternate airports for the origin and destination airports on the flight plan show as a circle around the letter A.
The MAP fail flag shows in the plan mode when the FMCS fails. TCAS status is the same as the map mode.
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PRIMARY DISPLAY SYSTEM -PLAN MODE
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PRIMARY DISPLAY SYSTEM -PFD AND ND DISPLAY 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 PFD and ND functions in the CPM/GGs independently process their formats. The PFD function has these sub-functions:
*
Display format processing
*
Display resource management
*
PFD display generator
*
Graphics generator.
The ND function shares the display format processing and display resource management sub-function. The ND function has these sub-functions:
*
ND generator
*
Graphics generator.
Both functions send data to the graphic generator sub-function. The graphic generator reformats and sends this data to the DUs.
IOM
Each IOM does these functions:
*
Presence and validity checks
*
Source select and filtering.
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The IOM modules do presence and validity checks on all display input parameters. Data updates ensure that the information the flight crew sees is current.
Each IOM removes bad data, replaces it with a good source, and filters the change from bad to a good data source. For critical data, the IOM sends 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/GG
Each CPM/GG also has a PFD and ND function with sub-functions. Each AIMS cabinet has a redundant pair (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 (PFD, ND, EICAS, or MFD). The EICAS and MFD functions configure and format the EICAS and MFD 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 outboard DU fails, the inboard DU automatically changes to the outboard format. The IOMs send display and switch input data to the display processing sub-function for the PFD and ND functions.
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PRIMARY DISPLAY SYSTEM -PFD AND ND DISPLAY FUNCTIONAL DESCRIPTION
PFD/ND Function-Display Format Processing
The display format processing sub-function receives display and switch input data from the IOMs. It receives status data from the display system resource management sub-function for CPM/GG redundancy management. The display format processing sub-function formats the data and sends PFD and ND format data to the PFD and ND generator sub-functions. It also sends status data to the other CPM/GGs.
PFD/ND Function-PFD and ND Generators
The PFD and ND display generator sub-functions reformat the display data for the graphics generator.
PFD/ND Function-Graphics Generator
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