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plus or minus the magnetic variation.
3.15.2 CDU Displays. The CDU display architecture is
organized into page formats. Each page consists of 8
display lines. The first seven are 22 characters wide for
displaying data. The bottom (eighth) line is 21
characters wide and is a scratchpad for entering or
editing data. Individual pages may display navigation
data, display failure messages, or indicate selectable
functions. The CDU displays are categorized into 5
basic page formats: NAV top level, ADMIN, FDLS,
HBCM, and FPLN. The CDU display will automatically
revert back to the NAV top level page based on two
basic rules:
Rule 1.-The CDU will revert to the NAV top level page
automatically from the ADMIN or any of the FPLN
(waypoint dictionary pages after 30 seconds if there are
no characters in the scratchpad. The 30 second timer is
reset each time a FPLN page is scrolled with the Up/
Down arrow when the scratchpad contains no data.
Remember: If the scratchpad contains any data the
display will NOT automatically revert back to the NAV top
level page.
Rule 2.-The CDU will revert to the NAV top level page
automatically from the ADMIN page 3 seconds after
pressing any of the following (VAB)s: PWR ON or PWR
OFF, BACKUP, MODE UTM or MODE L/L, and DISPL
KPH or DISPLKTS.
If the HBCM VAB on the ADMIN page or FDLS FAB is
pressed the CDU will NOT revert automatically back to
the NAV top level page. The NAV top level page can be
manually selected at any time from any page by pressing
the NAV FAB.
a. NAV Top Level Page. The NAV top level page
(fig 3-13) will be displayed approximately 30 seconds
after aircraft electrical power is applied. No data will be
displayed until the DNS power is turned on. The DNS is
powered by pressing the ADMIN VAB and then pressing
the PWR OFF VAB on the ADMIN page. The DNS
indicates a failure if it is powered and the HARS is OFF
or in the first 90 seconds of alignment. When the DNS is
powered, the NAV top level page (fig 3-14) will display
the following:
Figure 3-13. Power Up Display, NAV Top Level DNS
PWR OFF
Figure 3-14. NAV Top Level Page PWR ON
Change 3 3-49
TM 1-1520-238-10
NOTE
‘Refer to Data Entry and Operating Procedures (para
3.14.7.f and 3.14.8 ) as necessary.
Line 1.-PPOS represents the current DNS computed
present position in either UTM or LAT/LONG. The
PPOS data may be changed or edited.
Line 2. var and sph are the magnetic variation and
spheroid associated with the PPOS. var and sph may
be changed or edited.
Line 3.-BRG is the direct bearing to the destination
specified in the FLY TO position on line 7. ADMIN is a
VAB label that selects the page for the various
administrative functions associated with the DNS.
Line 4.-DIST and TTG are the distance and time-to go
(at current ground speed) to the destination specified in
the FLY TO position. DIST will display in either
kilometers or nautical miles, independent of the PPOS
data, as selected on the ADMIN page.
Line 5.-TKA and GS are the computed track angle and
ground speed. Ground speed may be displayed in either
kilometers per hour (KPH) or knots as selected on the
ADMIN page. The units for both DIST and GS are same
for a given selection: KM and KPH, or NM and KTS.
Line 6.-This is the CDU and DNS status line. The line
may be blank or display MEMORY, BACKUP, or vFDLS.
A display on this line indicates that the DNS has either
lost radar lock: MEMORY; the CPG has manually
selected BACKUP; or the Continuous FDLS test has
detected a fault in the CDU/DNS system.
Line 7. FLY TO shows the selected destination to which
the DNS is navigating. The displayed value can be any
of the 20 locations in; the FPLN dictionary; 0 (or H)
through 19. The FLY TO number can be changed.
TGT displays the storage location that will be used next
When the STR FAB is pressed; locations 16 to 19 are
used repetitively.
Line 8.-This is the scratchpad line for data entry.
b. ADMIN Page. The ADMIN page (fig 3-15 and 3-
16), is used to select other modes of DNS operation and
administrative DNS management and display functions.
The ADMIN page has the following:
Figure 3-15. ADMIN Page PWR OFF
Figure 3-16. ADMIN Page PWR ON
Line 1. PWR OFF or PWR ON is an alternate action
VAB powering the DNS. HBCM selects the Hover Bias
Calibration Mode page.
Line 2.-Identifies the ADMIN page.
Line 3.-TKAE is a data display only showing the Track
Angle Error. The L or R character specifies which
direction to steer to reduce the TKAE to zero. XTKE is a
　
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