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VAB 2 Not Used
VAB 3 Not Used
VAB 4 Not Used
VAB 5 Used to stop the calibration of the Hover Bias. Pressing VAB 5 will cause the message "HBCM
GO" or "HBCM NO-GO" to appear on line 2. This indicates a "within limits" or "out of limits"
calibration condition.
VAB 6 Not Used
VAB 7 Not Used
VAB 8 Used to return to the ADMIN sub-page display.
3.64.8 Change 3
7
TM 1-1520-238-10
d. Offset Update (OFS UPDATE) Page. If NAV- STAT
1, the offset update operations are disabled and, the
offset update page cannot be activated. If NAV-STAT 2
or NAVSTAT 3, offset update is accomplished through
actioning the Update/Store (UPDT/STR) rocker switch
located on the ORT. A momentary depression of the
UPDT side of the rocker switch results in the display of
the OFS UPDATE page (figure 3-26.4) on the CDU. VAB
functions are explained in table 3-22.4. The OFS
UPDATE page is displayed as follows
Figure 3-26.4. OFS UPDATE Page
Line 1. Blanked
Line 2. Displays the centered page title OFS UPDATE.
Line 3. Displays the legend PPOS XXX VN XXXX XXXX
representing the current PPOS at the moment of
activation of the OFS UPDATE page.
Line 4. Displays the legend CPOS XXS VN XXXX XXXX
representing the computed, corrected aircraft present
position based upon CPG range, LOS angles and aircraft
bearing relative to the currently selected active target.
Line 5. Displays the legend OFS PPOS ERR
X)OXXXXM. 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 displays the
legend REJECTO.
Line 8. - Blanked.
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.
e. FDLS page. Depression of the FDLS FAB
displays the FDLS page on the CDU. The display on the
CDU (Fig. 3-26.5) is intended to inform the operator that
FDLS prompts/displays will not be provided on the CDU,
and FDLS operations are to be conducted
through the ORT and HMD. All VABs are inactive on the
FDLS page display. Entry of any FDLS Menu two digit
codes into the CDU keyboard will initiate the FDLS BIT.
The CDU SPC key is used in conjunction with FDLS
operations as follows:
Change 3 3-64.9
8
TM 1-1520-238-10
Figure 3-26.5. FDLS Page
(1) Upon initial selection of FDLS, with more than one
FDLS NO-GO message displayed, depressing the
SPC key allows scrolling among the continuous
TEST NO-GO messages.
(2) With a FDLS Menu page displayed, depressing the
SPC key allows scrolling among the FDLS Menu
pages.
(3 )At completion of a maintenance test, with more than
one FDLS NO-GO message displayed, depressing
the SPC key allows scrolling among the
maintenance test NO-GO messages.
(4) With a FDLS Action/Acknowledge Prompt displayed,
depressing the SPC key is interpreted by the system
as an acknowledgement of the requested prompt.
(5) During an ongoing maintenance test without a FDLS
Action/Acknowledge Prompt displayed, depressing
the SPC key will abort the test.
3.16.8 FPLN CDU Displays. Depressing the FPLN FAB
displays the Waypoint List (WPT LIST) page
a. WAYPOINT LIST (WPT LIST) Page.
NOTE
• All data and messages depicted in displays are
typical representations.
• 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.
• Waypoints are numbered 1 through 40; Targets are
numbered through 80.
(1) Each page provides access to a list of 40 Waypoints
contained in the Waypoint List (Figures 3-26.6 and 3-
26.7) 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
numbering. Waypoints numbered 1-20 are displayed
on the first page; waypoint numbered 21-40 are
displayed on the second page. The first TGT LIST
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