Line Select Keys
Transfer data from scratch pad to line next to key if acceptable to FMS, or duplicate data from line next to key to scratch pad if scratch pad is blank and data is acceptable to FMS.

CDU Display
Displays pages of FMS data containing up to 6 full or 12 half lines of data as selected with CDU keys or by FMS logics.

Initialize Reference Key
Calls up first page of series used to initialize FMS and IRS, plus various pages of reference data.

Route Key
Calls up first page of series related to flight plan route on which data is displayed and entered.

Climb Key
Calls up first page of series relating to Climb.

Cruise Key
Calls up first page of series relating to Cruise.

Descent Key
Calls up first page of series relating to Descent.

Bright Knob
Controls intensity of CDU display.

Direct Intercept Key
Calls up LEGS page with prompts used to enter route from present position direct to waypoint, or to intercept designated course to waypoint.

Legs Key
Calls up first page of series displaying details of each Leg or route and list of all route waypoints with speed/altitude crossing restrictions.

Departure Arrival Key
Calls up first page of series listing all terminal area procedures in data base for Departure or Arrival.

Hold Key
Calls up page for entering Holding procedure into route, or for modifying pre-planned Holding pattern.

Progress Key
Calls up first page of series displaying dynamic flight and navigation data, including ETAs and fuel remaining for downline waypoints.

Execute Key
Activates flight plan, and changes to active flight plan and performance mode, when light bar is illuminated.

Blank
 

Fix Key
Calls up first page of series used to establish bearings and distances from off route nav aids as waypoints, and to display ETAs and distances.

Previous Page Key
Changes display to Previous page in multiple page series when pushed momentarily.

Next Page Key
Changes display to Next page in multiple page series when pushed momentarily.

AlphaNumeric Keys

• Alpha Keys - Enter Alpha characters in scratch pad
• DEL Key - Enter DELETE on scratch pad.
• CLR Key - Erases last character of scratch pad line or complete message when pushed momentarily. Erases entire scratch pad data entry when held.
• N, E, S, W Keys - Enters the respective words North, East, South and West in scratch pad.

Numeric Keys
Enter Numeric characters in scratch pad. First push of " +/- " key enters " - ". Subsequent pushes change entry alternately from " - " to " + ".

Display Light
Indicates page displayed is not related to the active route leg or performance mode.

Fail Light
Indicates fault in associated CDU or in FMS.

Message Light
Indicates FMS-generated Message is displayed on scratch pad, or waiting to be displayed when scratch pad is clear.

Offset Light
Indicates L NAV is based on a parallel route Offset from active route.