FMCS -FMCF FUNCTIONAL DESCRIPTION -VNAV SPEED AND ALTITUDE INTERVENTION ENGAGE LOGIC
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FMCS -FMCF FUNCTIONAL DESCRIPTION -DISPLAY CONTROL SUB-FUNCTION
General
The display control sub-function receives inputs from the CDUs and from the flight deck control panels. The display control sub-function, with these inputs, interfaces with the other sub-functions of the FMCF to supply:
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Map data to the primary display function (PDF)
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Flight path mode data to the PDF
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Page display data to the CDUs
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Messages to the CDUs
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Fault messages to the PDF
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Fault, data load, test display data to the CMCF.
Map Data
The display control sub-function formats and updates dynamic data and background data for the navigation display (ND) map mode. The display control sub-function uses inputs from the:
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EFIS control panel
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CDU push buttons
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Mode control panel (MCP).
Dynamic data is symbology or active alphanumeric data readouts. This shows as airplane position, velocity and airplane orientation on the NDs. This data has a refresh rate from one to 20 times per second.
Background data shows as stationary ground points and alphanumeric text data on the NDs. Background data has a refresh rate once every five seconds to ten seconds. New background data with a mode change occurs within one to two seconds.
Flight Path Mode Data
The display control sub-function sends dual flight mode data to the PDF when LNAV and VNAV sub-functions are active.
CDU Page and Message Display Data
The display control sub-function receives line select key, mode, function, and alphanumeric keyboard data from the CDUs to update and change display data and format. It also monitors CDU inputs for invalid entries and shows applicable advisory
messages in the CDU functions to advise or message in the scratchpad. scratchpad. alert the cr It ew monitors with an the appl other icable
Fault Messages
The display control sub-function listens to the BITE and fault monitoring sub-function and CDU keyboard inputs to cause fault messages to show on the EICAS display.
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FMCS -FMCF FUNCTIONAL DESCRIPTION -DISPLAY CONTROL SUB-FUNCTION
CMCF Data
Fault and test display data goes to the CMCF to show on the MAT. Data load information and progress for the CDU operational program and NAV data base goes to the MAT for display.
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FMCS -FMCF FUNCTIONAL DESCRIPTION -DISPLAY CONTROL SUB-FUNCTION
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FMCS -AUTOMATIC DEPENDENT SURVEILLANCE FUNCTION FUNCTIONAL DESCRIPTION
General
ATC sends automatic dependent surveillance (ADS) requests from the ground to the airplane. The ADSF in the airplane sends airplane data to the ground. ATC uses this data to manage air traffic. The ADSF is automatic and does not require flight crew action.
Functional Description
ATC sends ADS requests from the ground to the airplane. The link between the ground and the airplane is through the ACARS sub-function of the DCMF.
The DCMF sends the request to the ADSF. The ADSF receives inputs from these units and functions:
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Air data inertial reference unit (ADIRU)
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Flight management computing function (FMCF)
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Flight deck communication function (FDCF)
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Data communication management function (DCMF)
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Primary display function (PDF).
The ADSF uses these inputs to manage and format the transmission of ADS reports to the ground. The ADSF sends the report to the DCMF. The ACARS sub-function of the DCMF down links the report to the ground.
The reports contain data ATC uses to track the airplane in the air. These are examples of data transmitted to ATC:
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Airplane position
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Flight plan waypoints
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True heading
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True track
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Ground speed
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Wind speed
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Wind direction
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Position uncertainty
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Validity status of the airplane TCAS system
