BMS F-16C/D 4.34, Flight Manual

Page: 72 / 234

T.O. BMS1F-16CM-1 BMS 4.34 Change 2.00
BMS 4.34 Dash 1
© Red Dog 2012-2019
Page: 72
1.3.15. IFF page
IFF transponder operations are managed through 3 IFF UFC
pages: STAT (Status), TIM (Time) and POS (Position).
The default IFF page is the STAT page. Subsequent pages
are accessible with DCS right (SEQ).
IFF status can be OFF, STBY, ON, or DEGR (degraded) if the system has failed.
The last item on the first line is the TIM or POS criteria, whichever is active (see TIM and POS IFF
pages below). If both criteria are active P/T will be displayed. If neither criterion is active, nothing will
be displayed.
Active modes are highlighted. In the picture above Mode1, Mode2 and Mode4 are active; Mode3 and
ModeC and ModeS are inactive. IFF codes are given in regard to their respective mode: Mode1 code
is 13, Mode2 code 0504, Mode3 code is 5627 and Key A is currently in use for Mode4.
Selecting a mode is made through the scratchpad: enter 1 to toggle Mode1 on and off, enter 2 for
Mode2 toggling, 3 for Mode3, 4 for Mode4, 5 for Mode C and 8 for Mode S (currently not implemented)
Codes can also be entered manually with the scratchpad as follows:
Two digit encoding defaults to a M
ode1 code if it’s a valid code: first digit never above 7, second digit
never above 3.
Three or Four digit encoding defaults to Mode3 provided the code is valid (between 0000 and 7777
–
no digit above 7).
The F-16 can change Mode2, unlike other aircraft. Change the Mode2 code by prefixing the 4-digit
code with a 2. For example:
“2 – 4 - 6 – 5 – 0 – ENTR” will input 4650 as the M2 code.
Mode4 is encrypted and cannot be changed but can be switched between key A and key B. This is
done by entering “6 – ENTR” in the scratchpad.
Mode4 interrogation visual/audio feedback can be set with
“7- ENTR” in the scratchpad. It will toggle
between OUT (no feedback when Mode4 interrogated by another aircraft), LIT (the
“4” will be
highlighted on the CNI DED page
– and enlarged if repeated on the HUD - when interrogated by
another aircraft) and AUD (includes LIT plus in addition an audio tone is played
in the pilot’s headset if
a Mode4 interrogation not matching the set key is received).
The next two IFF subpages are used to change the IFF settings automatically according to time or
position criteria:
Press DCS SEQ to switch to the IFF POS subpage:
The IFF position page allows you to activate or deactivate
certain modes according to the position of your aircraft.
You can set 2 different position criteria by using the up and
down UFC arrow to toggle between page 1 and 2 (top right
number).This would allow you to set a different IFF setting at
fence in and at fence out for instance).
For the position criteria to be activated POS must be highlighted. Move the scratchpad to POS with
DCS up and hit 0 (M-SEL). POS will then highlight and the criteria are activated.
Position criteria do not include code changes but only toggle the different modes on/off. This is why
you do not see codes displayed on the POS page.
It is important to understand that toggling modes will depend on the current state of the mode in the
STAT page. You determine a position where modes will be toggled. Once the aircraft reaches this
position, the mode will be toggled. So if mode1, 2 and 3 are currently on and mode 4 is off as reported
by the STAT page, and you set mode1, 2, 3 and 4 to toggle in the POS subpage, then upon reaching
that position, the system will turn off mode 1, 2 & 3 and turn on mode4.
In the POS subpage you select which mode will toggle by typing
“1-ENTR” to toggle Mode1 in the
scratchpad position illustrated by the picture above, type 2 to select the Mode2, type 3 for Mode 3, 4