777 Control Display Unit (CDU)
by jerome meriweather
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Up To Fire
Inward to Mode Panel or Select Panel
Outward to Master Panel
To View a Control's Description, MouseOver it and ...
Click to "Show" - MouseDown to "Drag" - DoubleClick to "Hide"
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777 Photo and/or Graphic Element
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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.
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Selection Buttons
Buttons are used to carry out a pre-defined function that has been assigned to it by the current menu.
Scratchpad
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.
INIT REF
Provides manual and preflight INITIALIZATION of the FMC and access to various pages of REFERENCE data.
RTE
Used to enter Information on plane's ROUTE.
DEP ARR
Is used to select the DEPARTURE / ARRIVAL pages for the origin and destination airports for each route.
ALTN
Allows selection of ALTERNATE airports and display of related information.
VNAV
Provides VERTICAL NAVIGATION profile guidance through all phases of flight.
FIX
Used to create waypoint fixes and waypoints for display on the ND.
LEGS
Provides information about each LEG segment of the route.
HOLD
Is used to enter a HOLDING pattern into the route.
FMC COMM
Flight Management Computer Communication
PROG
Provides general flight PROGRESS information.
MENU
Provides access to other systems and MENUS that use the CDU.
NAV RAD
Displays radio tuning information and provides for manual operation of the NAVIGATION RADIO.
PREV PAGE
Returns to the PREVIOUS CDU page.
NEXT PAGE
Advances to the NEXT CDU page.
EXEC
EXECUTES the current command.
BRT
BRIGHTENS or darkens the display screen.