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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.
5. NAV FAB - Press to exit the HBCM. Observe
the CDU displays the NAV top level page.
d. MODE UTM or L/L. This is an alternate action
function which toggles PPOS and waypoint dictionary
coordinate displays between UTM and LAT/LONG.
This is done from the NAV top level present position
page as follows:
1. ADMIN - Press. Observe that the ADMIN
page is displayed.
2. MODE UTM - Press to change to MODE L/L
or vice versa.
e. DISPLAY KM or KTS. This is an alternate action
function which toggles the DIST and GS displays
between KM and KPH or NM and KTS respectively.
This is done from the NAV top level present position
page as follows:
1. ADMIN - Press. Observe that the ADMIN
page is displayed.
2. DSPL KM - Press to change to DSPL KTS or
vice versa.
3-56 Change 4
f. PPOS Updates to a Stored Waypoint Coordinate.
PPOS updates to a stored waypoint coordinate
are implemented from the NAV top level present position
page. When overflying a waypoint, do the following:
NOTE
A flashing UPDATE SPHEROID message
will appear on the scratchpad if the
FLY TO waypoint selected has a different
spheroid than the current present position
data.
1.
2.
3.
VAB 5 - Press. Observe PPOS data freezes
and FLY TO changes to UPDATE TO. The
DNS continues to compute aircraft present
position.
FLY TO - Press to complete an update to the
position of the waypoint plus any offset distance
traveled following the initiation of a
PPOS update.
To reject an update (abort), press either top
right VAB again or the NAV FAB.
NOTE
Following either an acceptance or rejection
of a PPOS update, the CDU displays
FLY TO and resumes displaying DNS
computed PPOS and status data dynamically.
g. PPOS Updates to an Unstored Waypoint.
PPOS updates to an unstored waypoint are implemented
from the NAV top level present position
page as follows:
1. PPOS - Press. Observe PPOS changes to UPDATE
and display freezes. This allows for
comparison of DNS computed present position
location with a known present position location.
NOTE
This type of PPOS update does not require
that the aircraft remain in a hover to update
the present position. This type of update
also provides for position compensation
for any distance traveled following a
PPOS update.
2. To complete the PPOS update to a known value,
the operator enters the desired present
position into the scratchpad and presses
UPDT or:
TM 1-1520-238-10
3. Rejects (aborts) the PPOS update by pressing
the NAV FAB.
NOTE
Following either an acceptance or rejection of a
PPOS update, the CDU resumes displaying DNS
computed PPOS and status data dynamically.
h. FLY TO Destination Selection. The number next
to the FLY TO caption on line 7 specifies which
prestored waypoint the DNS is to navigate to. Valid FLY
TO entries include values 1-19 and 0 or H. H and 0 are
synonymous. Enter a FLY TO destination as follows:
1. Enter desired prestored waypoint value on
scratchpad.
2. FLY TO Press. Observe that the entered value
now appears’ next to FLY TO and the
scratchpad is now blank.
i. UTM Coordinate Entries for Waypoint Dictionary.
UTM coordinate entries, including magnetic variation and
spheroid, may be entered into the waypoint coordinate.
The following is a typical format to be used when
entering UTM coordinates, magnetic variation and
spheroid data in the CDU scratchpad:
11SGQ52184911E14.8C6
Where 11S =Grid zone identifier
GQ =UTM 100 KM-square
identifier
5218 52.18 KM Easting within GQ
4911 =49.11 KM Northing within GQ
E14.8 =Magnetic variation
C6 = Spheroid identifier of CL6
A complete entry of UTM coordinates, magnetic
variation and spheroid data is not required under all
circumstances. Refer to table 3-16 for partial data
entry. When an incomplete set of data is entered
into the CDU scratchpad:
Rule 1 Order of Entry. The order of entry for UTM
coordinates, magnetic variation and spheroid
remains the same regardless of which parameters
are or are not entered. They are: grid zone identifier,
100 KM-square identifier, Easting/Northing; magnetic
　
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