Rocker keys
PRV NXT FUNCTION
Access screen to enter, edit and review mission data.
Access screen to initialize system, and download mission data.
Access present position screen.
Access navigation calculation screens.
Access system status screens.
Access navigation sensor status and control screen.
Not used.
Access test and maintenance screens.
Toggles between upper and lower functions of dual alphanumeric -mode keys.
Not used.
Access screen displaying choices of equipment to be zeroized.
Enters data from scratchpad to the selected data .eld.
Indicates an advisory condition. Press ADV key to acknowledge and clear the annunciator.
Indicates a change in system status. Access system status screen, or acknowledge from the screen to clear the annunciator.
Indicates that a message has been received, but not viewed.
Indicates a built in test (BIT) failure within the CDU. Access system status screen to clear the annunciator.
depending on CDU software, accesses previous or next screens, or choices in a list.

CONTROL  FUNCTION
BRT DIM  Adjusts brightness of CDU display screen.
Collective Stick
UP DN  Scrolls edit box through selections.
RAD SEL  Accesses COM screen from INIT, then selects radio.
3.4.2 CDU Display Screen Conventions. Some dis-play items have special meaning, no matter where they ap-pear on the screen:

INDICATION FUNCTION
RTN  A soft key, always located in the lower right key position, returns the display to the lowest priority menu screen from which the current screen was selected.
MARK  Allows the operator to mark an event or specify when data should be transferred.
****  Indicate a calculated value exceeds the limits of the display .elds, or no data is available for display .elds, or no data is available for display. A range value beyond
999.9 miles is displayed as ***** and a cross-track error with no valid TO waypoint will be displayed as *****.
Indicates that PRV NXT key (or collective switch) is operational for paging functions. These include changing records (as in stepping through preset or waypoint records) or stepping through .ight plan or quick review screens.

3.4.2.1 CDU Display Screen. The display screen is di-vided in three parts (Figure 3-2). The top is the .xed header area, followed by variable screen data area. At the bottom of the screen is the scratchpad, where entries are made with the keyboard.
3.4.2.2 Box Around Text.
a.
Indicates selection of a parameter for editing, the se-lection to be activated/initiated, or the active mode/item. At the same time the scratch pad displays the format that the entry is expected to follow: i.e., time [--:--:--].

b.
A parameter which is not editable but instead is re-lated to edit conditions may be boxed. For example, a boxed ACTIVE on the .ight plan screens indicated that any at-tempt to edit this entry will be ignored as that leg of the .ight plan is active.

c.
Move the box from editable item to item by pressing ENT. No entries will be made if the scratchpad is empty. An item may also be selected for editing by pressing the adjacent soft key.

3.4.2.3 Inverse Video. Inverse video is used to high-light soft key switch settings, alert conditions on the status line, new alert conditions, or to stale or invalid data. (i.e. if the nav system fails, the last known present position will be displayed in inverse video).
3.4.2.4 Soft Keys. Soft keys border the left and right sides of the display. Soft key functions depend on the cur-rent screen being displayed. In text, a soft key is identi.ed by its position and adjacent item. Soft keys only perform a function when there is an arrow displayed beside the key. Arrows which point inwards are for soft key functions per-formed on the screen (i.e. switch selections, or editing). Arrows which point outwards bring the operator to a new screen.
　
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