TM 55-1510-222-10
11. If UTM coordinates are to be used, verify
that appropriate grid coefficients have been
loaded.
(2) Insert present position:
NOTE
·
Prior
to
pressing
INSERT/ADVANCE pushbutton, any
incorrectly
loaded
data
can
be
corrected by pressing the CLEAR
pushbutton and reloading correct
data.
·
While
parked
aircraft
is
undergoing
alignment,
encoding
altimeter
will
supply
the
field
elevation (aircraft pressure altitude)
into INS.
·
Once present position has been
inserted
and
computer
has
advanced to alignment state 7,
present
position
cannot
be
reinserted without downmoding to
STBY and restarting alignment.
·
If
longitude
and
latitude
coordinates are being used, skip
following step (a) 2 and proceed
with step (b) 2.
1. Insert UTM coordinates of aircraft present
position:
a. Data selector UTM POS. Observe
that prior to initial load, INSERT/
ADVANCE pushbutton annunciator
illuminates.
b. To load zone and easting values
Press keys in sequence, starting with
E. Example: Zone 16, 425 km East
= El6 425. Observe that zone and
easting in kilometers appear in right
data display as keys are pressed.
c. INSERT/ADVANCE pushbutton Press.
Observe
pushbutton
annunciator
remains illuminated.
d. To load nothing data Press keys in
sequence, starting with N or S to
indicate north or south hemisphere.
Example: 4749 km North = N 4749.
Observe nothing kilometers appear in
left data display as keys are pressed.
e. INSERT/ADVANCE pushbutton Press.
Observe
that
the
pushbutton
annunciator remains illuminated.
f. INSERT/ADVANCE pushbutton Press.
Observe extra precision display for
present position nothing and easting,
to the nearest meter, appears in left
and right data displays, respectively.
g. To load extra precision easting data
Press keys in sequence, starting with
E. Example: 297 m East =E 297.
Observe that easting meters appear
in right data display as keys are
pressed.
h. INSERT/ADVANCE pushbutton Press.
Observe
pushbutton
annunciator
remains illuminated.
i. To load extra precision nothing data
Press keys in sequence, starting with
N or S.
Example: 901 m North =N 901. Observe that
nothing meters appear in left data displays as keys are
pressed.
NOTE
Extra precision values are always
added to normal values regardless
of which key (N/S) is pressed to
initiate the entry. The normal entry
establishes the hemisphere.
j. INSERT/ADVANCE pushbutton Press.
Observe latitude and longitude data is displayed
in
UTM
and
INSERT/ADVANCE
pushbutton
annunciator extinguishes.
NOTE
·
The
computer
will
convert
coordinates
in
the
overlap
area;
however display values will reference
appropriate zone.
·
The W key may be used to initiate
easting entries; however computer
will always interpret such entries as
an E input. E will be displayed in
normal UTM display.
·
Extra precision values are always
added to normal values. As an
example, South 4,476. 995 m will
display 4476S in normal display and
995 in extra precision display. There
is no rounding between the two
displays.
2. To insert geographic coordinates of aircraft
present position:
NOTE
Prior to pressing INSERT/ADVANCE
3-47
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