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on the CDU. VAB functions are explained in table
Line 4. - Displays the legend CPOS XXS VN XXXX
3-22.4. The OFS UPDATE page is displayed as fol-
XXXX representing the computed, corrected aircraft
present position based upon CPG range, LOS angles
lows: and aircraft bearing relative to the currently selected
active target.
Line 5. - Displays the legend OFS PPOS ERR
XXXXXM. This denotes the radial distance between
PPOS & CPOS. The value is used as a measure of PPOS
error by the CPG to determine whether to accept or reject
the update. The radial error is limited to 99999 meters
on the display.
Line 6. - Displays System Annunciator Data.
Line 7. - The left-hand character field displays the legend
OACCEPT. The right-hand character field dis-
Figure 3-25.4. OFS UPDATE Page plays the legend REJECT.
Line 1. - Blanked Line 8. - Blanked.
Change 4 3-64.9
TM 1-1520-238-10
Table 3-22.4. OFS UPDATE SUB-PAGE VARIABLE ACTION BUTTONS
Control/Display Function
VABs 1, 2, & 3 Not Used.
VAB 4 Used to accept the offset update. Display returns to page previously displayed prior to
selecting the offset update function.
VABs 5, 6 & 7 Not Used
VAB 8 Used to reject the offset update. Display returns to page previously displayed prior to
selecting the offset update function.
3.16.8 FDLS page. Depression of the FDLS FAB displays
the FDLS page on the CDU. The display on the
CDU (Fig. 3-25.5) is intended to inform the operator
that FDLS prompts/displays will not be provided on the
CDU. All VABs are inactive on the FDLS page display.
FDLS prompts will be provided through the ORT and
HMD. FD/LS operations are conducted through the
CDU keyboard and entry of any FDLS Menu two digit
code will initiate the FDLS BIT
Waypoints are numbered 1
through 40; Targets are numbered
41 through 80.
1. Each page provides access to a list of 40 Waypoints
contained in the Waypoint List (Figures
3-26.6 and 3-25.7) or 40 targets contained
in the Target List. The WPT LIST and
TGT LIST are identically formatted except
for the page title on line 2 of the display and
The Waypoint List and Target List
are separately, but identically,
structured. The following data applies
to the operation of both.
Where minor operating differences
occur, each is described separately.
numbering. Waypoints numbered 1-20 are
displayed on the first page; waypoints numbered
21-40 are displayed on the second page.
Figure 3-26.6. FDLS Page The first TGT LIST page will list numbers
41-60; page 2 will list numbers 61-80. The se-
3.16.9 FPLN CDU Displays. Depressing the FPLN
FAB displays the Waypoint List (WPT LIST) page.
cond page of each list is accessed by depressing
VAB 8 on page 1. Depressing VAB 8 on the
second page will return the display to the first
a. Waypoint List (WPT LIST) Page. page.
3-64.10 Change 4
Figure 3-25.6. FPLN Top Level Page
Figure 3-25.7. FPLN Second Level Page
2. Three special symbols are associated with Active
FLY-TOs and Active TGTs on these
pages. An Asterisk (*) symbol displayed to the
right of a TGT or WPT designator (TXX or
WXX) indicates that location as the Active
FLY-TO location. Similarly, an outlined cross
( q ) symbol indicates the location is the Active
Target location. A pound (#) symbol displayed
to the right of the designator indicates that
point as being BOTH the Active FLY-TO and
the Active TGT location.
3. With either the TGT or WPT LIST page displayed,
entry of a valid Coordinate Symbol
TM 1-1520-238-10
(TXX or WXX with valid coordinates previously
entered) into the scratchpad and depression
of any of VABs 1-4 will cause the
scratchpad entered data to become the Active
FLY-TO location. Depression of any of VABs
5-8 will cause the scratchpad entered data to
become the Active TGT location. With an invalid
coordinate symbol, the “ERROR” message
is displayed in the scratchpad.
Line 1. - Displays waypoints 001 02 03 in the Lefthand
character field; waypoints 13 14 1% in the righthand
character field.
Line 2. - Displays centered title WPT LIST.
Line 3. - Displays waypoints 004 05 06 in the Lefthand
character field; waypoints 16 17 180 in the righthand
character field.
Line 4. - Blanked.
Line 5. - Displays waypoints 007 08 09 in the Lefthand
character field; waypoints 19 200 in the righthand
character field.
Line 6. - Blanked.
Line 7. - Displays waypoints 010 11 12 in the Lefthand
character field; waypoints 21-400 in the righthand
character field.
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