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23.6.5.1.1 Mission Initialization. The AMU provides the capability to load the following mission
initialization files: COMM, DCS CAS, DCS NETS, and WYPT S/S. The COMM file contains the radio
presets, HAVE QUICK and SINCGARS data. The DCS CAS file contains pre-planned VMF FTXT
(free text) messages, pre-planned VMF 9-line brief messages, and an empty data file reserved for
inflight received CAS and/or FTXT messages. The DCS NETS file contains a set of network
parameters to be used for a unique network environment used in VMF message communications. The
WYPT S/S file contains a list of waypoint names for the IP (initial point) and control points that are
either entered or received in CAS 9-line briefs. See figure 23-22.
A1-F18EA-NFM-000
VII-23-30 ORIGINAL
Figure 23-22. MUMI Displays
A1-F18EA-NFM-000
VII-23-31 ORIGINAL
23.6.5.2 Status Monitoring.
23.6.5.2.1 Cautions and Advisories. DCS has the ability to trigger eight advisory messages;
COM1H(2H), COM1S(2S), COM1L(2L), BIT and DCSCS. COM1H(2H) is triggered when HAVE
QUICK time is not loaded. COM1S(2S) is triggered when SINCGARS time is not loaded. COM1L(2L)
advisory is triggered by an error in the MC to radio data loading process. BIT is triggered when a failure
is detected by BIT. DCSCS is triggered when a COMSEC failure is detected.
23.6.5.2.2 BIT Top Level Display. The top level BIT display for DCS is the same as the COM2
format. Status is indicated for DCS as COMM2. See figure 23-23.
23.6.5.2.3 COMM BIT Sub-Level Display. The COMM sub-level BIT display appears when the
COMM option on the top level BIT display is selected. The COMM BIT display for DCS is the same
as the ARC-210 with the DCS being represented as COM2.
a. DCS Option. Initiated BIT is run by selecting the COM2 option. DCS status is displayed in the
center of the page represented as COM2.
23.6.5.2.4 Software Configuration. The software configuration for the DCS is checked by selecting
CONFIG on the top level BIT display.
23.7 IFF - IDENTIFICATION FRIEND OR FOE
The IFF (identification friend or foe) transponder set provides automatic identification of the
aircraft in which it is installed when challenged by a surface or airborne interrogator set and provides
momentary identification of position (I/P) upon request. The system operates in modes 1, 2, and 3/A
selective identification feature (SIF) modes; and in mode C, the altitude reporting mode. Mode 4,
which is a crypto mode, is available when the transponder computer KIT-1A is installed in the aircraft.
Normal IFF transmission is disabled when EMCON is selected.
23.7.1 IFF on Top Level CNI Format. When on the top level CNI format, IFF power application is
identified by a corner highlight in the upper left corner of the IFF touch option/display. The option
displays the current mode 1 code (1- 00 thru 73) and mode 3 code (3- 0000 thru 7777) regardless of
whether the IFF is powered and regardless of whether the mode is enabled. The mode 1 code may be
changed by touching two valid numbers on the keypad, verifying these numbers in the scratchpad, and
touching the IFF option. The mode 3 code may be changed by touching four valid numbers on the
keypad, verifying these numbers in the scratchpad, and touching the IFF option. If an invalid data
entry is made, ERROR is displayed in the scratchpad. Entry of any number of digits other than two
or four followed by touching the IFF option displays ERROR in the scratchpad.
23.7.2 IFF Sublevel. The IFF sublevel is selected by touching the IFF touch option/display before
entering any data in the scratchpad (see figure 23-24). This sublevel is used to control power to the IFF
system, to enable the IFF modes, and to enter new mode 1 and mode 3 IFF codes. On initial IFF
sublevel selection, mode 3 is automatically enabled for data entry. The IFF is on when the ON/OFF
touch option/display is corner highlighted and displays ON. The IFF system is OFF when the option
is not corner highlighted and displays OFF.
A1-F18EA-NFM-000
VII-23-32 ORIGINAL
Figure 23-23. BIT Displays
A1-F18EA-NFM-000
VII-23-33 ORIGINAL
The IFF modes 1, 2, 3, and C are enabled and disabled by touching the respective option. When
KIT-1A is installed, modes 4A and 4B are enabled and disabled by touching the respective option. If
KIT-1A is not installed, the mode 4A and 4B options are not displayed. Mode 4A and 4B are mutually
exclusive. The mode 1, 2, 3, C, 4A and 4B options are border highlighted when selected for enable. An
option without a border highlighted is not selected for enable. The modes may be selected for enable
or disable when the IFF system is either powered or unpowered. Any mode that is border highlighted
with the IFF system powered is immediately enabled, any mode that is border highlighted with the IFF
　
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