BMS F-16C/D 4.34 Flight Manual page 154

T.O. BMS1F-16CM-1
Nevertheless to change modes in all IFF (transponder and interrogator) pages:
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ICP 1 followed by ICP ENTR toggles Mode 1 Active and Inactive.
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ICP 2 followed by ICP ENTR toggles Mode 2 Active and Inactive.
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ICP 3 followed by ICP ENTR toggles Mode 3 Active and Inactive.
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ICP 4 followed by ICP ENTR toggles Mode 4 Active and Inactive.
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ICP 5 followed by ICP ENTR toggles Mode C Active and Inactive.
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ICP 8 followed by ICP ENTR toggles Mode S Active and Inactive (not implemented).
Codes can be changed as well:
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Mode 1 code can be changed by inputting a two digit valid code + ENTR in the scratchpad.
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Mode 2 code can be changed by inputting 2 then a 4 digit code + ENTR (a total of 5 digits).
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Inputting a code of 3 or 4 digits + ENTR changes the Mode 3 code.
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Mode 4 key can't be changed. You can only toggle between A and B keys by inputting ICP
key 6 then ENTR
•
Mode C is just a request for pressure altitude, so there is no correct answer to that
interrogation.
•
Mode S is not implemented.
By default pilots do not know when their jet is being interrogated by another IFF system. That
information might be handy, especially when you are interrogated in Mode 4 and your jet isn't able to
send the right answer. Indeed if your system didn't reply correctly to an interrogation, chances are that
the contact who just interrogated you might consider you a bogey. There is a way to enable audio
cues for that specific purpose.
On the IFF STAT page you can see the OUT (7) in the centre of the bottom line. Pressing ICP 7 then
ENTR will toggle the IFF Mode 4 feedback between available options which are:
•
OUT: no feedback at all (the default option).
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LIT: visual feedback when interrogated with the 4
symbol highlighted on the UFC CNI page whenever
your jet is interrogated in Mode 4.
•
AUD: an audio tone will be played in addition to the
visual signal (LIT) if your jet is interrogated in Mode 4
and the interrogation key does not match your key.
LIT only provides a visual cue when interrogated, no matter the answer. AUD sounds the aural cue
only when the jet is unable to answer the Mode 4 interrogation correctly. Setting it to AUD is therefore
recommended, as you want to be warned when this happens.
1.16.4.2 Interrogator
Aircraft equipped with an interrogator have two modes of
interrogation: SCAN and LOS (Line of Sight).
Each interrogation mode (SCAN or LOS) has its own DED
page accessible by pressing LIST RCL. It defaults to the SCAN
INTG (Interrogator) page; the LOS page can be accessed with
a DCS right (SEQ). Both pages have the same format and are
completely independent.
You may select different active modes and codes for both pages. These settings will be remembered,
allowing pilots to have different schemes of interrogation for SCAN and LOS. We will come back later
on to the INTG pages.
Please note, the transponder and interrogator are also independent from each other. Active modes
may be different and set according to the IFF policy in the transponder page, but the pilot may elect to
customise his interrogation sequence according to preference.
BMS 4.34 Dash 1
© Red Dog 2012-2019
BMS 4.34 Change 2.00
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