Waypoint Activation

Destination Selection

Waypoint Definition

Mark Definition

Desired Track/Desired Vertical Angle Selection

Altitude Hold Activation

Stationary Mode Activation

Flight Instrument Scaling

Map Datum Selection

Acquisition Uncertainty Selection

4.2.3.1.3  Multifunction CDU

A view of the front panel of a multifunction CDU, with a sample display, is shown in

Figure 4 2. The CDU has an eight line, 22 character display controlled by standard and

special function keys, full alphanumeric keypad, and eight line select keys.  The CDU

utilizes a menu driven approach for control, display, and data entry in lieu of the rotary

switches of the dedicated CDU.

Figure 4 2.  Example of a Multifunction CDU

The CDU includes enhanced area navigation software and a dual redundant MIL STD 

1553 data bus.  It is capable of operating as either a bus controller, backup bus

controller, or remote terminal.  The CDU can act as the MIL STD 1553 bus controller

and exchange data with the following equipment:

4 4