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replies to valid
mode 4 interrogations. A
pulse tone will be heard
in the headset when a
code A interrogation is
received but the CODE
control switch is in B
position and vice versa.
At LIGHT, only the light
will illuminate when the
transponder replies to
mode 4 interrogations. At
OUT, the audio and REPLY
light monitoring is
disabled.
MODE 4 TEST-ON-OUT
Switch
At ON, the transponder
replies to valid mode 4
interrogations. At OUT,
mode is disabled. At
TEST, mode 4 is tested
for proper operation. If
test is valid, TEST GO.
Mode 4 REPLY Light Illuminates to indicate
valid mode 4 replies
when MODE 4 AUDIO
LIGHT switch is set to either
AUDIO or LIGHT.
TEST GO Light Illuminates when transponder
responds properly
to TEST position of
M-1, M-2, M-3A, M-C, or
MODE 4 TEST-ON-OUT
swithces.
TEST/MON NO GO Light The light illuminates
when any of the following
occurs:
a. MASTER switch is on
STBY.
b. Transponder does not
respond to interrogation.
CONTROL/
INDICATOR
FUNCTION
c. Transponder does not
respond to TEST position
of mode switches.
d. Transponder malfunctions.
RAD TEST Switch At RAD TEST, the transponder
replies to interrogations
from external test
equipment. At OUT the
RAD TEST feature is inoperative.
IDENT-MIC Switch AT IDENT, the set will
transmit a coded identification
pulse for about 20
seconds to all interrogating
stations on modes 1,
2, and 3/A to identify the
helicopters position. OUT
position turns off the
identification pulse. MIC
feature is not used in this
installation.
STATUS Indicators The indicator lights are
part of built-in-test equipment.
A lit ALT indicator
indicates trouble in The
encoding altimeter. A lit
KIT indicator indicates
trouble in the computer
or the computer is not
installed. A lit ANT indicator
indicates antenna
trouble.
ANT Switch Three-position antenna
diversity switch labeled
TOP, DIV, and BOT. Normal
position is DIV.
When jamming is heavy,
TOP or BOT antenna
may be selected.
IFF Fail Light (Located
on the center instrument
panel)
The light will illuminate in
MODE 4 when any of the
following occurs:
a. The computer is
installed without a code.
b. No reply or improper
reply is made to a valid
interrogation.
c. A malfunction occurs
in the transponder.
TM 1-1520-240-10
3-4-3
3-4-3. Normal Operation — Transponder System.
The following steps provide transponder system operating
procedures.
a. Starting.
(1) Move the MASTER switch from OFF to
STBY. If the aircraft is so equipped, observe that the
STBY light on the aircraft advisory panel comes on. Also,
note that the NO GO light is on.
(2) Allow 2 minutes for warmup.
(3) Select the codes assigned for use in modes
1 and 3/A by depressing and releasing the pushbutton for
each switch until the desired number shows.
(4) Operate the PRESS-TO-TEST feature of
the lamp indicators.
(5) Place the ANT switch BOT.
(6) Move the MASTER switch from STBY to
NORM.
(7) Hold the M-11 switch to TEST, observe that
the TEST/GO indicator lights.
(8) Restore the M-1 switch to ON.
(9) Repeat (7) and (8) above for the M-2, M-3/A
and M-C mode switches.
(10) Place the ANT switch TOP.
(11) Repeat (7), (8), and (9) above.
(12) Place the ANT switch DIV.
(13) Repeat (7), (8), and (9) above.
NOTE
If KIT1C is not installed or keyed the following
steps are not required.
(14) Set the MODE 4 rotary switch to A. If the
external computer is used, set a code in it.
(15) Set the MODE 4 AUDIO/LIGHT/OUT switch
to OUT.
(16) Hold the MODE 4 TEST/ON/OUT switch to
TEST.b.
(1) If the computer is used, observe that the
TEST GO indicator lights. If the computer is not connected,
observe that the TEST/MON/NO GO indicator
lights and the KIT STATUS indicator lights.
(2) Observe that the MODE 4 REPLY light and
CAUTION light (on a separate “panel”) do not light.
(3) Restore the MODE 4 TEST/ON/OUT switch
to ON for computer use, or to OUT if no computer is
used.
c. Stopping.
(1) If code retention is desired:
(a) MODE 4 CODE selector switch —
HOLD, then release.
(b) MODE 4 CODE selector switch — A or
B, as applicable.
(c) MASTER control switch — OFF.
(2) If code retention is not desired:
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