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entry followed by an altitude entry within .60 seconds will cause the system to
re-calibrate the ADS pressure sensor bias correction.
VAB 7 Used for selecting HBCM sub-page. Valid only if HBCM ð is present indicating the DNS
system is “GO”.
VAB 8 Used for selecting DSPL:KM or DSPL:NM signifying metric system or nautical system,
respectively, in use for coordinate display. Depressing VAB 8 toggles between the two (2)
choices.
Change 4 3-64.7
TM 1-1520-238-10
c. HBCM Page. The HBCM page, (fig 3-25.3) is
used to START and STOP the velocity bias calibration
of the DNS. The HBCM calibrates the DNS system for
small velocity errors that may be present in the doppler
receiver/ transmitter subsystem. The velocity bias
corrections are computed by the DNS computer and are
applied to all subsequent doppler radar velocities.
When HBCM is selected, the CPG can manually start
and stop the calibration. If a NO-GO condition is detected,
a recalibration can be initiated by pressing
START again. This will zero the timer and allow for
additional bias velocities calculations. If TIME message
is displayed, re-initiate the calibration. If the
BIAS message is displayed, re-initiate calibration one
time. If the BIAS message is displayed again, write up
the system. If the excessive memory message is displayed,
attempt to re-locate the aircraft over a surface
area that is a non-reflective surface (short grass/coarse
surface area) and re-initiate the calibration. If a GO
calibration is computed, the bias velocities will automatically
be stored and applied continuously to all subsequent
DNS velocities. VAB functions are explained in
table 3-22.3. The display has the following:
Line 7. - The right-hand character field displays the
Line 1. - Displays the legend ð START in the left-hand
character field; the HBCM title in the center character
field, and the legend STOP ð in the right-hand character
field.
Line 2. - Displays the legend(s) HBCM READY;.
HBCM ACTIVE, HBCM GO, or HBCM NO-GO as
appropriate in the left-hand character field.
Lines 3. & 4 - If line 2 displays HBCM READY or
HBCM ACTIVE, lines 3 & 4 will display the current
DNS velocity biases. If line 2 displays HBCM GO, lines
3 & 4 will display the new DNS velocity biases. If line 2
displays HBCM NO-GO, line 3 will display the HBCM
fail condition. If a second fail condition exists, it will be
displayed on line 4, otherwise line 4 is blanked. Possible
DNS error messages are:
TIME BELOW 2 MIN
BIAS EXCEEDS 0.3 KTS
EXCESSIVE MEM
Line 5. - Blank.
Line 6. - Displays the legend TIME: XX:XX in the lefthand
character field indicating elapsed time in min- --
utes/seconds for DNS computations of the bias calibration.
The timer will stop while the DNS is in memory
during the bias calibration. The legend MEM will be
displayed following "TIME: XX:XX" if the DNS velocity
is invalid; otherwise the rest of line 6 is blanked.
legend ADMINO.
Figure 3-25.3. HBCM Page Line 8. - Blank.
Table 3-22.3. HBCM SUB-PAGE VARIABLE ACTION BUTTONS
Control/Display
VAB 1
VAB 2
VAB 3
Function
Used to initiate or re-start the calibration of the Hover Bias. Pressing VAB 1 causes the
display on line 2 to change from “HBCM READY”’ to “HBCM ACTIVE” and starts the
timer display located on line 6. Calibration time is dynamic and is displayed in minutes
and seconds (M:SS).
Not Used
Not Used
3-64.8 Change 4
TM 1-1520-238-10
Table 3-22.3. HBCM SUB-PAGE VARIABLE ACTION BUTTONS - continued
Control/Display
VAB 4
VAB 5
Function
Not Used
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 NAV- Line 2. - Displays the centered page title OFS UPSTAT
1, the offset update operations are disabled and DATE.
the offset update page cannot be activated. If NAVSTAT
2 or NAVSTAT 3, offset update is accomplished Line 3. -
through actioning the Update/Store (UPDT/STR)
Displays the legend PPOS XXX VN XXXX
rocker switch located on the ORT. A momentary depres-
XXXX representing the current PPOS at the moment of
activation of the OFS UPDATE page.
sion of the UPDT side of the rocker switch results in
the display of the OFS UPDATE page (figure 3-25.4)
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