TM 55-1510-220-10
•
One station must be at least 15 nm off course.
•
For optimum single TACAN station updating, update
should continue until aircraft has passed the station.
•
For optimum dual TACAN station updating, use one
"off-track" TACAN station and one "on-track" station.
•
For optimum multi-TACAN station updating, the
stations should be evenly distributed in azimuth around
the aircraft.
(11)
Switching from aided to unaided inertial operation.
(a)
Data selector DSRTK/STS.
(b)
Key "5" Press. Observe INSERT/ADVANCE
pushbutton annunciator illuminates; 000005
appears in right data display.
(c) INSER/ADVANCE pushbutton Press.
Observe INSERT/ ADVANCE pushbutton
annunciator extinguishes. Data display
returns to normal with "5" appearing in first
digit of right display.
NOTE
Benefits
of
previous
aiding
are
maintained
but
no
additional
automatic updates will be made.
(12)
o obtain readouts from INS:
NOTE
The computer is assumed to be in the
NAV mode for all data displays.
(a)
System status: Data selector DSRTK/STS.
Observe numbers indicating system status appear in right
data display.
(b) Geographic present position: Data selector
UL POS. Observe latitude and longitude of present position
appear in left and right data displays, respectively. Both
displays are to tenth of a minute.
(c)
UTM position: Data selector UTM POS.
Observe northing and zone with easting of present position
appear in left and right displays, respectively. Both displays
are in kilometers.
(d)
True
heading:
Data
selector
HDG/DA.
Observe aircraft heading appears in left data display to
nearest tenth of a degree.
(e)
Groundspeed: Data selector TK/GS. Observe
groundspeed appears in right data display to nearest knot.
(f)
Ground track angle: Data selector TK/GS.
Observe ground track angle appears in left data display to
nearest tenth of a degree.
(g)
Drift angle: Data selector HDG/DA. Observe
drift angle appears in right data display to nearest degree.
(h)
Wind speed and direction: Data selector
WIND. Wind direction appears in left data display to nearest
degree and wind speed appears in right display to nearest
knot.
(i) Desired
track
angle:
Data
selector
DSRTK/STS. Observe desired track angle in right data
display to nearest degree.
(j)
Track angle error: Data selector XTK/TKE.
Observe track angle error appears in right data display to
nearest degree.
(k)
Cross
track
distance:
Data
selector
XTK/TKE. Observe cross track distance appears in left data
display to nearest nautical mile.
(I)
Distance
and
time
to
next
waypoint:
DIS/TIME. Observe distance to next waypoint, shown in
"TO" side of TO-FROM display, appears in left data display
to nearest nautical mile. Observe distance to next waypoint,
shown in "TO" side of TO-FROM display, appears in left data
display to nearest nautical mile. Observe time to reach next
waypoint at present groundspeed appears in right data display
to nearest tenth of a minute.
(m)
Extra precision geographic present position
display:
1.
Data selector UL POS. Latitude and
longitude of present position, to nearest
tenth of a minute, appears in left and
right data displays, respectively.
2.
INSERT/ADVANCE pushbutton press.
Observe arc-seconds related to present
position latitude and longitude, to
nearest tenth of a second, appear in left
and right data displays, respectively.
Change 2 3-62
