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Test and FPLN dictionary Pages.
1. ADMIN - Press. Observe that the ADMIN page
is displayed.
2. PWR OFF - Press. Observe PWR OFF
changes to PWR ON and CDU display changes
to NAV top level present position page after 3
seconds.
NOTE
If PWR OFF changes to PWR --- or the NAV top
level present position page is not displayed after
approximately three seconds, the DNS has failed.
If FDLS Status Page (fig 3-22) is displayed, the RAM
battery has failed. The DNS RAM battery test is only
performed at PWR ON. The On Command FDLS test
can be initiated from this page by pressing TEST. Refer
to On Command Test (FDLS) part of this paragraph for
detailed procedures.
Figure 3-22. FDLS Page - Continuous Test
Results
3-54 Change 3
TM 1-1520-238-10
a. CDU or DNS Memory Zeroize. The DNS
memory zeroize function is used for maintenance purposes
only after the CDU or signal data converter has
been replaced. The CDU memory zeroize resets all
flight plan dictionary page waypoints to bogus default
values. This is done from the NAV top level present
position page as follows:
1.
2.
3.
4.
5.
6.
ADMIN - Press. Observe that the ADMIN
page is displayed.
Enter CDU on the scratchpad.
ZERO - Press.
FPLN - Press. Observe that all locations on
the FPLN dictionary page displayed contain
the similar default values:
31T BV 6355 8711
E 000.0 sph CL6
Using the up and down arrow keys, scroll
through all FPLN dictionary pages, observing
that all location contain the default value.
NAV - Press. Observe that the NAV top level
present position page is displayed with default
data next to the captions.
b. BACKUP Mode. In the BACKUP mode, the
last remembered radar velocities become the source for
navigating.
This mode provides the capability to the operator of
manually entering GS and TKA via the NAV top level
present position page.
The BACKUP mode must be manually accessed. To operate
the BACKUP mode do the following:
1.
2.
3.
4.
ADMIN - Press. Observe that the ADMIN
page is displayed.
BACKUP OFF - Press. Observe that BACKUP
OFF changes to BACKUP ON.
Enter GS data into the scratchpad and press
VAB 7. Observe the data is now displayed on
line 5 next to GS.
Enter TKA data into the scratchpad and press
VAB 3. Observe that the data is now displayed
on line 5 next to TKA.
C. HBCM. In HBCM the DNS determines the
hover bias velocities in both the longitudinal and lateral
axis of the DNS. The computed bias velocity corrections
are applied to all future DNS hover velocity computations.
HBCM is accessed via the NAV top level
present position and ADMIN pages.
NOTE
Hover bias calibration only needs to be
performed when the signal data converter
or RTA has been replaced.
1.
2.
l
l
3.
ADMIN - Press. Observe that the ADMIN
page is displayed.
HBCM - Press. Observe that the HBCM page
(fig 3-17) is displayed.
NOTE
If line 2 of the HBCM page does not
display HBCM READY, the DNS has
failed.
The time indicated on line 5 of the
HBCM page increments only when
DNS is performing hover bias computations.
if the DNS goes into memory
mode, the time display halts until the
signal from the RTA is sufficient for
DNS computations.
START - Press. Observe that on line 2
HBCM READY changes to HBCM ACTIVE
and on line 5 the time displayed begins incrementing.
NOTE
The calibration continues until the CPG
presses STOP to stop it. When the calibration
is stopped, the mode status will
be displayed. Allow the calibration to run
for at least two minutes but not more than
8 minutes.
4. STOP - Press. Observe that the time display
freezes and a mode status message is displayed
on line 2. If applicable, DNS error messages
will be displayed on lines 3 and 4. The
DNS indicates the HBCM update was accepted
when an HBCM GO is displayed or not
accepted when an HBCM NO-GO message is
displayed along with a description of the exceeded
limit(s) on other lines. Possible DNS
error messages are:
TIME BELOW 2 MIN
TIME EXCEEDED 8.2 MIN
BIAS EXCEEDS 0.3 KTS
EXCESSIVE MEM CONDITION
Change 4 3-55
TM 1-1520-238-10
NOTE
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 either TIME message is displayed,
re-initiate the calibration. If the
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