TM 1-1520-238-10
3-64.10
Change 8
Table 3-22.3.
HBCM SUB–PAGE VARIABLE ACTION BUTTONS – continued
Control/Display
Function
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.
d. Offset Update (OFS UPDATE) Page. If NAVSTAT
1, the offset update operations are disabled and the offset
update page cannot be activated. If NAVSTAT 2 or NAV-
STAT 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 UP-
DATE page (figure 3-25.4) on the CDU. VAB functions are
explained in table 3-22.4. The OFS UPDATE page is dis-
played as follows:
M01-0328
OFS UPDATE
PPOS 12S VN 3263 0377
CPOS 12S VN 3263 0356
OFS PPOS ERR 210M
MEM NAV STAT3 3 FDLS
ACCEPT
REJECT
Figure 3-25.4.
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 activa-
tion 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 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
ACCEPT. The right–hand character field displays the
legend REJECT .
Line 8. – Blanked.
