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HARSHDG?--HARS heading data may be invalid
HARS TST---HARS in internal test mode
HARSLAT?---HARS latitude may be invalid
HARSFAST---HARS in fast align mode
HARSNORM--HARS in normal align mode
HARS GO-----HARS aligned and operational
HARSNOGO---HARS is not operationally usable
Line 6. - Displays System Annunciator Data.
Line 7. - The right-hand character field displays the
legend DATAO.
Line 8. - Blanked.
b. Navigation Sensor (NAV SENSOR CONTROL)
Page. The NAV SENSOR CONTROL page is accessed
by depressing VAB 2 on the DATA Menu page. The NAV
SENSOR CONTROL page is displayed as shown in
figure 3-26.14. VAB 7 is used to return to the DATA
MENU top level page. VAB functions are explained in
table 3-22.9.
3-64.16 Change 3
15
TM 1-1520-238-10
Figure 3-26.14. NAV SENSOR CONTROL Page
Line 1. - Left-hand character field displays the legend
MODE:WATER or MODE:LAND.
Line 2. - Displays the centered page title NAV SENSOR
CONTROL.
Line 3. The left-hand character field displays OTKA
XXX/YYKPH only when MODE: WATER is displayed on
line 1; otherwise, this field is blanked.. When OTKA
XXX/YYKPH is displayed, the XXX/YY will appear as
dashes until the Ground Track/Ground Speed entry is
made. Subsequently, it will display system ground track
and speed.
Line 4. - Blanked.
Line 5 - Left-hand character field displays the legend
DNS RF:OFF or DNS RF:ON.
Line 6. - Displays System Annunciator Data.
Line 7. - The right-hand character field displays the
legend DATA.
Line 8. - Scratchpad.
Table 3-22.9. NAV SENSOR CONTROL PAGE VAB OPERATIONS
Control/Display Function
VAB 1 Toggles between MODE: LAND and MODE: WATER. The system defaults to MODE: LAND at
power up.
NOTE
This entry is only useable for a water start (without GPS or EGI capability). If this operation is
attempted (it is not recommended), the aircraft must be aligned with the moving platform to within
°, the heading entry must be accurate to 5° and the speed accurate to within 2 knots. Additionally,
when the aircraft departs the moving platform, aircraft inertial speed must be maintained and the
DNS RF:OFF switched to ON. If manual speed is not within 2 knots of the DNS speed and if the
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), an in flight restart is required.
VAB 2 With aircraft heading and GRND SPD data entered in the scratchpad, depressing the VAB will
load the data into line 3 of the display. Entry limitation are 000 to 359 degrees and 00 to 99 KPH
(or KTS) respectively. Both entries are required if this function is used to aid the INS. Entry is only
effective during INS startup. If MODE:LAND is selected on line 1, this line is blanked and the
function is inhibited.
VAB 3 Toggles between DNS RF:ON and DNS RF:OFF. System defaults to DNS RF:ON at power up.
With "squat switch" activated and MODE:WATER selected, system automatically changes to
DNS RF:OFF; this can be manually overridden by the CPG. When DNS RF:OFF is selected, an
operator initiated BIT of the DNS will cause the legend to change to DNS RF:ON prior to BIT
starting. This function is blanked until the system has initialized the DNS.
VABs 4 -7 Inactive.
VAB 8 Selects return to DATA MENU top level page.
Change 3 3-64.17
16
TM 1-1520-238-10
c. Data Transfer Unit (DTU) Page. The DTU page is
accessed by depressing VAB 3 on the DATA Menu
page. The DTU page is displayed as shown in figure 3-
26.15) VAB 8 is used to return to the DATA MENU top
level
page. VAB functions are explained in table 3-22.10.
Line 1. - Left-hand character field displays the legend
>LOAD ALL The right-hand character field displays
the legend LOAD PPOSO except when the aircraft is
airborne.
Line 2. - Displays the centered page title DTU.
Figure 3-26.15. DATA TRANSFER UNIT Page
Line 3. - The left-hand character field displays the legend
OLOAD WPTS. The right-hand character field
may be blank or may display the legend DTC INITO.
Line 4. - Blanked.
Line 5 - Left-hand character field displays the legend
OLOAD TGTS. The right-hand character field displays
the legend FCC SAVEO.
Line 6. - Displays the left justified DTU LOAD/SAVE
prompts listed below. If any of the first three prompts
are displayed, all DTU operations are inhibited.
DTU INOP
NO DTC
DTC FORMAT INVALID
DTC READY
TARGETS LOAD FAIL
WAYPOINTS LOAD FAIL
LASER CODES LOAD FAIL
PPOS LOAD FAIL
UPLOAD ALL FAIL
TARGETS LOAD COMPLETE
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