*
Time to go (TTG)
*
Distance to go (DTG)
*
Route
*
CDU position
*
CDU (L, C or R) source for display.
Background Data
The active FMCF sends this background data to the NDs in the map and plan mode only:
*
Runways
*
Airports
*
Waypoints, flight plan and off route waypoints
*
Navaids (VOR, DME, etc.)
*
Beacons, marker and non-directional
*
Procedure turns
*
Holding patterns
*
Energy management circles.
If both FMCFs fail, the on-side CDU goes into the back-up navigation mode. In this mode, the on-side CDU sends this background data to the on-side ND through the PDF:
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FMCS -FMCF/CDU MESSAGES
General
The FMCS sends messages to the CDUs and the primary display system. The FMCS messages alert and advise the flight crew with:
*
Information that relates to airplane system level of operation
*
Airplane flight phase of operation
*
Entry errors.
The CDUs show the FMCS message content in the scratchpad and the CDU MSG annunciator comes on. The FMCF sends an alert discrete that causes the advisory message (FMC MESSAGE) to show on the EICAS display. The alert message content shows in the CDU scratchpad.
The CDUs show messages when they operate as the alternate navigation source.
Message, Priority, and Reset
The CDUs show these three message types in this priority:
*
Entry error advisory
*
Alert
*
Advisory.
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The CDUs store messages in stacks with a maximum of ten in each stack. The entry error advisory message has priority over the alert and advisory message that show in the CDU scratchpad. Alert messages have priority over advisory messages.
When a CDU scratchpad message occurs, it goes to the top of the related stack. A new message pushes down any other messages in the stack. A maximum of ten messages may enter a stack. If the stack is full and another message occurs, the message at the bottom of the stack exits the stack.
The CDU scratchpad message clears out of the scratchpad in one of these ways:
*
A push of the CLR key -one push removes one message
*
A new message occurrs at the same level or higher
*
The condition that causes the message resets.
All CDU scratchpad messages are white.
Entry Error Advisory Messages
Entry error advisory messages relate to any crew entries on a CDU. Each CDU responds to entries from its keyboard. These are examples of entry error advisory messages:
*
NOT IN DATA BASE
*
INVALID ENTRY
*
STANDBY ONE
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FMCS -FMCF/CDU MESSAGES
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The CDU that is in use for entry shows the entry error advisory message in its scratchpad. The MSG annunciator comes on for all CDUs. The CDUs can supply the entry error advisory messages when the FMCFs fail.
Alert Messages
Alert messages tell the flight crew a flight phase or flight mode limitation. These are examples of alert messages:
*
END OF ROUTE
*
NO ACTIVE ROUTE
*
UNABLE NEXT ALTITUDE
*
INSUFFICIENT FUEL.
Alert messages set the CDU output discrete to show the advisory FMC MESSAGE on the EICAS display. The left and right CDU scratchpad shows the alert message.
The CDU annunciator MSG comes on for all CDUs.
Scratchpad display priority does not override the alert message indication on the EICAS display and MSG annunciator on the CDUs.
The approach flight phase and below 500 feet above ground level (AGL) inhibits the display of the alert messages when the arrival runway is part of the active route. The alert messages that occur in this flight phase show at flight completion or after the airplane climbs through 1000 feet AGL.
Advisory Messages
Advisory messages tell the crew flight activity they should perform to make their flight go smoothly. These are examples of advisory messages:
*
NOT ON INTERCEPT HEADING
*
RWY/ILS COURSE ERROR
*
TIMEOUT -RESELECT.
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