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legend DATA.
Line 8. - Scratchpad.
Change 4 3-64.17
TM 1-1520-238-10
Table 3-22.10. NAV SENSOR CONTROL PAGE VAB OPERATIONS
Control/Display Function
WAB 1 Toggles between MODE&AND and MODE:WATER. The system defaults to
MODE:LAND at power up.
NOTE
This entry is only useable for Airborne or Sea Starts without GPS or EGI capability.
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.
c. Data Transfer Unit (DTU) Page. The DTU page is the legend LOAD PPOSO except when the aircraft is
accessed by depressing VAB 3 on the DATA Menu page. airborne.
The DTU page is displayed as shown in figure 3-25.15)
VAB 8 is used to return to the DATA MENU top level Line 2. - Displays the centered page title DTU.
page. VAB functions are explained in table 3-22.11.
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 INITCt
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
Figure 3-25.15. DATA TRANSFER UNIT Page
DTC FORMAT INVALID
Line 1. - Left-hand character field displays the legend
OLOAD ALL The right-hand character field displays DTC READY
3-64.18 Change 4
TM 1-1520-238-10
TARGETS LOAD FAIL UPLOAD ALL COMPLETE
WAYPOINTS LOAD FAIL
LASER CODES LOAD FAIL
PPOS LOAD FAIL
UPLOAD ALL FAIL
TARGETS LOAD COMPLETE
WPTS LOAD COMPLETE
FCC SAVE-OK
FCC SAVE FAIL
The LOAD FAIL and LOAD COMPLETE prompts
refer to initialization data that was loaded in the DTC
using the Aviation Mission Planning System (AMPS).
Line 7. - The left-hand character field displays the legend
OLOAD CODES. The right-hand character field
displays the legend DATAO. -
Line 8. - Scratchpad
CODES LOAD COMPLETE
PPOS LOAD COMPLETE
Table 3-22.11. DTU PAGE VAB OPERATIONS
Control/Display Function
VAB l Initiates LOAD of Waypoints, Targets, Laser Codes, and Present Position from cartridge.
To preclude inadvertent load of PPOS, the LOAD ALL function will not load PPOS if the
aircraft is airborne.
VAB 2
VAB 3
VAB 4
VAB 5
VAB 6
VAB 7
Loads WPTS from cartridge.
Loads TGTS from cartridge.
Loads CODES from cartridge.
Loads PPOS from cartridge unless aircraft is airborne.
Reformats DTC for normal use if DTC INITOis displayed; otherwise blanked.
Saves critical data in the FCC volatile memory (BST DATA, PPOS, Altitude, Altitude
Corrections, MAGVAR, etc.) to non-volatile memory and saves the waypoints, targets,
laser codes and PPOS to the DTC “SAVE” file.
VAB 8 Returns to the DATA MENU top level page.
d. ZEROIZE Page. The ZEROIZE page is accessed seconds without an operator depression of VABs 1,4,7,
by depressing VAB 4 on the DATA MENU page. The or 8, the display automatically reverts back to the
ZEROIZE page is displayed as shown in figure DATA MENU top level page.. VAB functions are ex-
3-25.16. VAB 8 is used to return to the DATA MENU plained in table 3-22.12.
top level page. If the ZEROIZE page is displayed for 5
Change 4 3-64.19
TM 1-1520-238-10
Figure 3-25.16. ZEROIZE Page
Control/ Display
VAB 1
VABs 2-3 Inactive.
VAB 4 Zeroizes the DNS SDCC RAM Memory only.
VABs 5-6 Inactive.
VAB 7
VAB 8
Line 1. - Left-hand character field displays the legend
OCONFIRM ZEROIZE ALL.
Line 2. - Displays the centered page title ZEROIZE
Line 3. - Blanked
Line 4. - Blanked.
Line 5 - The right-hand character field displays the
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