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received the strongest interrogation signal.
4. MASTER switch OFF - Deenergizes se!.
STBY - Energizes receiver-transmitter for immediate operation upon
switching to an operating position.
NORM -Allows receiver-transmitter response to interrogations.
EMER - Energizes receiver-transmitter and generates emergency replies
to mode I,2 (thumbwheel settings), and 3/A (code 7700) and a normal reply
to mode C, when interrogated, whether mode switches are at ON or OUT.
Figure 21-1. IFF Control Panels (Sheet 1 of3)
ORIGINAL 21-2
NAVAIR Ol-Fl4AAD-~
NOMENCLATURE
i. STATUS lights (red)
FUNCTION
ALT - Illumination indicates altitude encoder circuit failure during
MODE C test.
KIT - Illumination indicates KIT/KIR TSEC failure during MODE 4 test.
ANT - Illumination indicates excessive voltage standard wave ratio
(VSWR) to antenna during MODE C or MODE 4 tests.
I. RAD switch TEST - When selected, transponder replies to mode 3/A or 4 TEST
mode interrogations from a ramp test set during ground
maintenance testing.
‘. IDENT-OUT-MIC
switch
OUT - Deenergized position.
IDENT - Momentary position provides IDENT reply for 15 to 30 seconds
after releasing switch; replies to interrogation in modes 1,2,3/A.
OUT - Deenergizes circuit,
MIC - Transfers IDENT reply activation switch from IDENT to radio
microphone switch
I. MODE 4 REPLY light Illuminates when system has successfully replied to a mode 4 interrogation
provided the AUDIO/LIGHT/OUT switch is not in the OUT position.
I. MODE4
AUDIO/LIGHT/OUT switch
AUDIO - Enables (1) An ICS tone indicating either incomplete signal
reception or that the received interrogation code does not match
the installed code, (2) no go and IFF caution lights indicating no
reply to a valid mode 4 interrogation, and (3) MODE 4 REPLY
light indicating a valid mode 4 interrogation reply.
LIGHT - Enables (1) no go and IFF caution lights indicating no reply to a
valid mode 4 interrogation, and (2) MODE 4 REPLY light
indicating a valid mode 4 interrogation reply. Disables ICS audio
tone monitoring.
IO. CODE selectors
(MODE 1 and 3/A
Il. MODE 4 switches
OUT - Disables all ICS tone and light monitoring of mode 4
interrogations, replies, and nonreplies.
Code selectors are rotatable drums with imprinted numbers that appear in
code selector windows, permitting selection of codes for mode 1 and 3/A.
ON - Enables mode 4.
OUT - Disables mode 4.
See Figure 21-2 for mode 4 caution/reply light logic.
TEST - Activates KIT mode 4 computer self-test. TEST GO light
illuminates if system if functional, NO GO if it is not.
If KIT computer is at fault, STATUS KIT light illuminates red. If
KlTlKlR is not installed, NO GO and STATUS KIT lights
illuminate.
Figure 21-I. IFF Control Panels (Sheet 2 of 3)
21-3 ORIGINAL
NAVAIR 01-F14AAD-1
NOMENCLATURE
12. MODE2
FUNCTION
Code selectors are rotatable drums with imprinted numbers that can be seen
when sliding cover is moved out of view. Changing requires pointed object.
Not normally changed in flight.
13. MODE 4 CODE switch ZERO - Erases code 4 from KIR-IA and KIT-1A computers. IFF ZERO
advisory legend appears on upper left of RIO’s MFD.
B- Selects KIT-IA computer B code.
A Selects KIT-1A computer A code.
HOLD - Retains code in KIR-1A computers when landing gear is down
or when system is turned off.
14. MODE switches
(1.2, 3/A, and C)
TEST -
ON -
GO TEST light illuminates if system is functioning property; NO
GO TEST light illuminates if system failure.
Permits selection of interrogating modes to which the
transponder will reply.
15. M4 ALARM OVERRIDE
switch
OUT - Deenergized position.
Disables the mode 4 tone alarm to the RIO’s ICS.
16. FAULT light Indicates a malfunction of APX-76 receiver-transmitter, caused by receiver,
video, or transmitter signals.
17. CHAL light Remains illuminated for the duration of a challenge period indicating correct
operation.
18. CODE selectors
19. TEST-CHAL CC switch
First thumbwheel selects mode, 1, 2, 3A, 4A, or 4B. Last four thumbwheel
rotatable drums with imprinted numbers appearing in code selector windows,
permit selection of desired interrogation code.
Momentary two-position center-return switch.
TEST - Onboard transponder is triggered by onboard interrogator. Both
sets must have same code setting. IFF solid lines are displayed
on DD at 3 and 4 miles.
20. IFF warning legend
CHAL A selective identification feature (SIF) interrogation cycle starts
cc - the 5-to lo-second challenge period. Only correct modes and
　
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