intensity in incremental steps to the maximum level.
When pushed at the bottom, the brightness is
decreased in incremental steps to the minimum level.
When the unit is turned on, the brightness is preset to
80% of the maximum level.
(8) Power Switch. The power switch,
placarded ON / OFF, is a rocker type switch which,
when pressed at the top, turns the system on and
initiates the self test process. When pushed at the
bottom and held for approximately 2 seconds, the unit
will turn off. Prior to turning off, a caution message is
presented on the screen.
(9) Numeric Entry Keys. The CDU has 10
numeric entry keys that are used to enter numerals 0
to 10. Eight of the 10 numeric keys are also used to
enter North, South, East, West, left, right, minus (-),
and plus (+).
(10) Alpha Entry Keys. The CDU has 26 keys
that are dedicated to entering the characters A through
(11) Enter Key. This key, placarded ENTER,
is used to insert the data displayed under the cursor or
a complete page of information into the computer
memory. It is also used to select various menu items
and to approve specific cursor statements.
(12) Clear Key. The clear key, placarded
CLR, may be used to clear a single character in a data
field, a complete data field, or an entire page
depending upon the procedure used. It is also used
on non-enterable fields preceded by a right caret (>) to
cycle between two or more related selections.
(13) Hold Key. Pressing the hold key,
placarded HLD, allows the CDU to display the two
hold pages (HOLD 1 and HOLD 2). The HOLD 1 page
is displayed the first time the HLD key is pressed and
the HOLD 2 page is displayed when the HLD key is
pressed again (alternate action). The HOLD functions
are used for updating the FMS present position and for
creating a waypoint at the aircraft's present position.
(14) Data Key. The data key, placarded DAT,
is used for viewing the two data menu pages (DATA 1
and DATA 2). It is also used for returning from lower
level data pages to higher level data pages.
(15) Navigation Key. Pressing the alternate-
action navigation key, placarded NAV, allows viewing
of the two NAV pages (NAV 1 and NAV 2). The NAV
1 page is displayed by pressing the NAV key once the
NAV 2 page is displayed by pressing the NAV key
(16) Waypoint Key. The waypoint key,
placarded WPT, has two functions: to cycle through
the waypoint pages associated with the active flight
plan (FPL 0), and to display the waypoint pages of
other waypoints in the system.
(17) Flight Plan Key. The flight plan key,
placarded FPL, is used to select viewing of the active
flight plan page (FPL 0) or the flight plan menu pages
(FPLS). Pressing the key repeatedly will cycle through
the FPL 0 page and all FPLS pages and then back to
the FPL 0 page. If the CDU is displaying a page other
than the FPL 0 page or a FPLS page, pressing the
FPL key once will display the FPL 0 page.
(18) Direct to key. The direct to key,
placarded D , allows selection of Direct To
operation. It may be used anytime after system
(19) Display Screen. Presents display pages.
Page Display Definitions. The CDU
presents information to the pilot arranged like pages in
a book. Individual displays on the CDU are therefore
referred to as pages. With the exception of the self-
test page and the system failed page, each page has a
header at the top consisting of:
(1) Page Name located in the upper left
portion of the header.
(2) Selected Sensor located in the lower
left portion of the header.
(3) Method of Operation located in the
upper right portion of the header.
(4) Mode of Operation located in the lower
right portion of the header.
The following is a list of page names that will
appear (as selected) in the page name field: