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1. Stationary Start. This method assumes a normal
aircraft startup while the aircraft is
parked and the LAND mode is used. EGI
alignment is automatic. HARS mode switch is
mode. The EGI will automatically use GPS
data to aid in startup. The HARS mode switch
is placed to FAST after the heading tape on
the video is visible. When the HARS Heading
Flag is retracted from the HSI, the HARS
mode switch is placed to OPERATE. The
DASE may then be engaged.
Change 4 3-64.3
TM 1-1520-238-10
3. Automatic Sea Start (with GPS). A sea start
assumes the aircraft is moving relative to the
earths’ surface, the squat switch indicates
ground, and WATER mode is selected soon after
power is applied. The EGI will automatically
use INU data to aid in startup. The
HARS mode switch is placed to FAST after the
heading tape on the video is visible. When the
HARS Heading Flag is retracted from the
HSI, the HARS mode switch is placed to OPERATE.
The DASE may then be engaged.
NOTE
If the following operations are attempted
(it is NOT recommended) Heading entry
must be accurate to within 5 degrees of
the actual aircraft heading and the speed
entry accurate to within 2 knots. For Sea
starts, when the aircraft departs the moving
platform, aircraft inertial speed must
be maintained and the DNS RF: OFF
switched to ON. If manually entered
speed is not within 2 knots of the DNS
speed and DNS does not stay out of
memory, then the possibility of the INS
and HARS rejecting the DNS velocity is
high. If this occurs (Velocity vector error),
a forced inflight restart is required.
4. Manual Airborne or Sea Start (without GPS
or INU). Manual entry of inertial speed and
heading is required. When the entries are
completed, the heading tape will be displayed
and the HARS mode switch is placed to FAST.
When the HARS Heading Flag is retracted
from the HSI, the HARS mode switch is
placed to OPERATE. The DASE may then be
engaged. For Sea Starts the pilot, after liftoff,
must maintain speed and constant heading
with the ship (same as entered speed and
heading); move off the ship over water; then
the CPG will toggle the CDU DNS RF switch
from OFF to ON.
5. Forced Inflight Restart. Place the HARS mode
switch to FAST to power up HARS and DNS.
When HARS heading flag is retracted, place
HARS mode switch to OPR. HARS and EGI
will use DNS velocity to complete alignment.
3.18.7 CDU Displays. The CDU display architecture is
organized into page formats. Each page consists of 8
display lines. All lines are 22 characters wide. The bottom
line (eighth) is used as a scratchpad for entering or
3-64.4 Change 4
editing data. Individual pages may display navigation
data. display failure messages, or indicate selectable
functions. The CDU displays are categorized into 8 top
level page formats: NAV, TGT, DATA, CODE, FDLS,
PGM, WPN, and FLPN. The CDU will automatically
revert back to the NAV top level page from the ADMIN
page after 30 seconds if there are no characters in the
scratchpad and no other key presses are made.
a. NAV Top Level Page. The NAV top level page
(fig 3-25.1) will display the following:
Figure 3-25.1. NAV Top Level Page (UTM
Format)
Line 1. - Displays the legend PPOS followed by the
current PPOS coordinates. PPOS represents the computed
present position in either UTM or LAT/LONG
coordinates. PPOS changes to OUPD when an on-themove
manual PPOS update is initiated.
Line 2. - The left-hand character field displays the legend
VAR followed by the PPOS MAGVAR in degrees. If
the INS is NO-GO, an outlined arrow will be displayed
immediately to the left of VAR permitting
manual MAGVAR updates. The right-hand character
field displays the legend D followed by the PPOS Datum
number.
Line 3. - The left-hand character field displays the legend
BRG XXXDEG reflecting the direct bearing to the
destination specified in the FLY TO legend. The BRG
legend is a read-only display. The right-hand character
field displays the legend ADMIN. An outlined arrow
following ADMIN indicates the ability to select
the ADMIN page for display.
Line 4. -The left-hand character field displays the legend
DIST XXX.XKM. DIST is displayed in KM (kilometers)
when the coordinate system in use is metric,
and in NM (nautical miles) when the coordinate system
in use is nautical. The display uses a floating decimal
TM 1-1520-238-10
point allowing a distance accuracy of 10 meters (32
feet) when DIST is less than 100 KM units. The DIST
　
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