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code replies are displayed (two brackets only on DD).
Indicates mode 4 interrogation was received, but system has not generated
reply; mode 4 KlTlKlR computers have been zeroized; KIT/KIR has failed
self-test.
Figure 21-1. IFF Control Panels (Sheet 3 of 3)
ORIGINAL 21-4
NAVAIR 01.F14AAD-I
TRANSPONDER INTERROGATOR
(APX-100) (APX-76) CAUTION REPLY (APX-100)
4 OUT (A) STBY A ON OFF
4 ON (A) STBY A ON OFF
4 ON (A) NORM A OFF ON
4 ON (A) NORM 0 OFF OFF
4 ON (B) NORM A OFF OFF
4 ON (B) NORM B OFF ON
4 ON (B) STBY B ON OFF
4 ON (B) STBY B ON OFF
4 ON (A) NORM RAD VERIFY BIT 1 (A) OFF ON
TEST
4 ON (A) NORM VERIFY BIT 1 (A) ON OFF
4 ON (A) STBY VERIFY BIT 1 (A) ON OFF
KIT ZERO AORB ON OFF
Figure 21-2. Mode 4 Caution and Reply Light Logic
Illumination of the GO TEST light indicates proper
operation of that mode. Illumination of the NO GO
TEST light indicates failure of the selected mode. The
MASTER switch must be set to NORM for the test
function to operate. The modes not being tested should
be OUT when testing on the ground to prevent unnecessary
interference with nearby ground stations. If a
malfunction exists during these self-tests, an IFX acronym
will appear on the tactical information display
(TID). The IFF transponder is also continuously
checked by aircraft self-test. Failure causes the IFX acronym
to be shown on the TID. Calling up the failure
historytileortheCNIOBCdisplayonanyMFDwillshow
whethert he failure is in the transpondecr omputer( IFA),
the transponde(rI FXPN), or the entires ystem( IFX).
21.1.1.6 RAD TEST-OUT Switch. The springloaded
RAD TEST is used for testing. It enables a mode-
3/A code reply to a TEST mode interrogation from a
ramp test set. It also enables a mode 4 reply to a VERIFY
1 interrogation from a surface station or a ramp test set.
A VERIFY 1 interrogation is a modified mode 4 interrogation
used for testing.
21 .I .l .7 Mode 4 Operation. Mode 4 operation is
selected by setting the MODE 4 toggle switch ON, provided
that the MASTER switch is NORM. Setting the
MODE 4 switch to OUT disables mode 4.
The MODE 4 CODE switch is placarded ZERO, B,
A, and HOLD. The switch must be lifted over a detent
to switch to ZERO. It is spring-loaded to return from
HOLD to position A. Position A selects the mode 4 code
for the present code period and position B selects the
mode 4 code for the succeedingc ode period. Both codes
are mechanically inserted into the transponder by maintenance
personnel. The codes are mechanically held in
the IFF, regardless of the position of the MASTER
switch or the status of aircraft power, until the first time
the landing gear is raised. ThereaRer, the mode 4 codes
will automatically zeroize anytime theMASTERswitch
or the aircraft electrical power is turned off. The code
settings can be mechanically retained after the aircraft
has landed (landing gear must be down and locked) by
turning the CODE switch to HOLD and releasing it at
least 15 seconds before the MASTER switch or aircraft
electricalp oweri s turnedo ff. The codesa gainw ill beh eld,
regardlesso f the statuso f aircrafl power or the MASTER
switch, until the next time the landing gear is raised.
The mode 4 codes can be zeroized anytime the aircraft
power is on and the MASTER switch not OFF by
turning the CODE switch to ZERO.
An audio signal, the REPLY light, and the IFF caution
light are used to monitor mode 4 operation. The
AUDIO/LIGHT/OUT switch controls these mode 4 indicators.
When the IFF MASTER switch is in NORM
and the MODE 4 TEST/ON/OUT switch is on, selecting
AUDIO on the MODE 4 AUDIOiLIGHT/OUT switch
provides two types of mode 4 caution indications: (1) an
ICS audio tone indicating either incomplete signal reception
or the received interrogation code does not
match the installed code, and (2) a no go light and IFF
caution light indicating the system is not responding to
a valid mode 4 interrogation. Selecting the lightposition
disables the ICS audio tone and provides only the IFF
caution light and no go light. Selecting the OUT position
disables the ICS tone, no go light, and IFF caution light
indications and disables the REPLY light indication of
a valid reply. (Caution and REPLY light logic is shown
in Figure 21-2.) I
21-5 ORIGINAL
NAVAIR 0%Fl4AAD-l
Note
When flying in a tactical environment, the
MODE 4 AUDIO/LIGHT/OUT switch
should remain in the AUDIO position at all
times. Use of a switch position other than
audio will deny the aircrew mode 4 caution
　
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