777 Control Display Unit (CDU)|
by jerome meriweather
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There are 3 CDUs that provide flight crews Flight Management Computer ( FMC ) control.
The CDU uses crew-entered flight plan information, airplane systems data and data from the navigation database to calculate airplane present
position and pitch, roll and thrust commands required to fly an optimum flight profile. Normally, one CDU is active and the others are inactive.
All flight management computing tasks are accomplished by the active CDU, while the inactive CDUs monitor the active one and are ready to
replace it should a system fault occur.
Buttons are used to carry out a pre-defined function that has been assigned to it by the current menu.
Display area for information and data.
AlphaNumeric Key Pads
- AlphaNumeric Pad - Allows the flight crew to type in commands and data into the Control Display Unit.
- Space Key - Displays a space between words or data.
- DEL Key - Displays DELETE in the scratchpad. Is used to delete commands and data from the CDU.
- CLR Key - CLEARS the scratchpad.
- N, E, W, S - North, East, West and South key inputs.
- Period Key - Displays an asterisk (*) in the scratchpad.
Provides manual and preflight INITIALIZATION of the FMC and access to various pages of REFERENCE data.
Used to enter Information on plane's ROUTE.
Is used to select the DEPARTURE / ARRIVAL pages for the origin and destination airports for each route.
Allows selection of ALTERNATE airports and display of related information.
Provides VERTICAL NAVIGATION profile guidance through all phases of flight.
Used to create waypoint fixes and waypoints for display on the ND.
Provides information about each LEG segment of the route.
Is used to enter a HOLDING pattern into the route.
Flight Management Computer Communication
Provides general flight PROGRESS information.
Provides access to other systems and MENUS that use the CDU.
Displays radio tuning information and provides for manual operation of the NAVIGATION RADIO.
Returns to the PREVIOUS CDU page.
Advances to the NEXT CDU page.
EXECUTES the current command.
BRIGHTENS or darkens the display screen.