TM 1-1520-238-10
Change 8
3-64.19
Table 3-22.10.
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 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
accessed by depressing VAB 3 on the DATA Menu page.
The DTU page is displayed as shown in figure 3-25.15)
VAB 8 is used to return to the DATA MENU top level page.
VAB functions are explained in table 3-22.11.
M01-0343
LOAD CODES DATA
LOAD ALL
LOAD PPOS
DTU
LOAD WPTS
LOAD TGTS FCC SAVE
DTC READY
Figure 3-25.15.
DATA TRANSFER UNIT Page
Line 1. – Left–hand character field displays the legend
LOAD ALL The right–hand character field displays the
legend LOAD PPOS except when the aircraft is air-
borne.
Line 2. – Displays the centered page title DTU.
Line 3. – The left–hand character field displays the legend
LOAD WPTS. The right–hand character field may be
blank or may display the legend DTC INIT .
Line 4. – Blanked.
Line 5. – Left–hand character field displays the legend
LOAD TGTS. The right–hand character field displays
the legend FCC SAVE .
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
