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NOTE
This procedure utilizes bit to perform a
self-test on the AN/APX-100 IFF. Because
bit cannot test the KIT-1A/TSEC, this test
will only verify the operational readiness
of the IFF in MODES 1, 2, 3/A and C.
a. MODE 4 CODE selector switch - position
A.
b. MODE 4 AUDIO/LIGHT/OUT switch -
OUT.
c. MODE 4 TEST/ON/OUT switch - TEST.
Observe that TEST GO indicator lights
and MODE 4 REPLY indicator does not
light.
d. MODE 4 TEST/ON/OUT switch - ON.
5. ANT switch - BOT.
6. Repeat steps (3b) through (3c(1),
that TEST GO indicator lights.
but observe
7.
8.
9.
10.
TM 1-1520-238-10
ANT selector switch - TOP.
Repeat steps (3b) through (3c(1), but observe
that TEST GO indicator lights.
ANT selector switch - DIV.
Repeat steps (3b) through (3c(1), but observe
that TEST GO indicate; lights.
NOTE
When possible, request permission from
interrogating station to activate radar
test mode.
11. RAD TEST switch - RAD TEST and hold.
12. RAD TEST switch - Return to OUT.
13. Verify from interrogating station that TEST
MODE reply was received.
3.17.4 Normal Operation. Completion of the starting
procedure leaves the APX-100(V) in operation. The following
steps may be required, depending upon mission.
a.
Due to possible operating problems
of the (IFF), usage of the UHF radio
on frequency ranges 341.325 thru
36325 is prohibited while operating
the IFF in MODE 4.
Normal Mode.
1. MODE 4 CODE selector switch - A or B as
required.
a.
b.
If MODE 4 code retention is desired, after
landing and before turning the MASTER
control switch OFF or helicopter power
off, place the MODE 4 CODE selector
switch to HOLD and release. Allow
approximately 15 seconds for the HOLD
function to operate before turning the
MASTER control switch OFF or helicopter
power off.
If MODE 4 code retention is not desired,
either place the MODE 4 CODE selector
switch to ZERO or with the helicopter on
the ground turn the MASTER control
switch OFF. For both methods zeroizing is
immediate.
Change 2 3-69
TM 1-1520-238-10
2. Mode M-1, M-2, M-3/A, M-C, or MODE 4
switches - Select desired mode.
3. IP Switch - IDENT, when required, to transmit
identification of position pulses or set IP
switch to MIC to transmit IP pulse only when
microphone press-to-talk switch is actuated.
(IP pulses will be for 15 to 30-second duration
when activated.)
b. Emergency Mode. During an emergency or
distress condition, the APX-100(V) may be used to
transmit specially coded emergency signals on MODE
1, 2, 3/4 and 4 to all interrogating stations. Those
emergency signals will be transmitted as long as the
MASTER control switch on the control panel remains
in EMER.
1. MASTER control switch - EMER.
c. Stopping Procedure. Refer to paragraph
3.17.4 a. before stopping transponder.
1. MASTER control switch - OFF.
3.17.5 Transponder Computer KIT-1A/TSEC and
KIT-1C/TSEC. The transponder computer operates in
conjunction with MODE 4. A caution light on the pilot
and CPG caution/warning panel, marked IFF, will go
on when a malfunction occurs that will prevent a reply
when interrogated or the KIT-1A or KIT-1C computers
have failed. MODE 4 operation is selected by placing
the MODE 4 switch ON. Placing the MODE 4 switch
to OUT disables MODE 4. As with the other modes of
the transponder, the MASTER control switch must be
placed in the NORM position to provide power and permit
functioning of the selected modes. MODE 4 CODE
switch is placarded ZERO, B, A, and HOLD. The
switch must be lifted over a detent when rotated to
ZERO. Position A selects the MODE 4 CODE for one
period, and position B selects the MODE 4 CODE for
another period. The switch is spring-loaded to return
from HOLD to the A position. Both A and B codes are
either mechanically inserted into the KIT-1A or electronically
inserted into the KIT-1C. A KYK-13 or similar
keying device is used to load the KIT-1C. The
KIT-1C must have operable batteries or have been
turned on, as previously described, before it will accept
and hold the codes. The KIT-1A does not require power
because it is mechanically keyed. Once keyed the
KIT-IA and KIT-1C (with operable batteries) will retain
the codes regardless of MASTER control switch
position or helicopter power as long as the helicopter is
on the ground. Once the helicopter has become airborne
(determined by the squat switch) the MODE 4 codes
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