TM 11-5841-291-12
c. This manual cannot identify all
troubles that may occur, nor all tests
Before doing any tests, make sure
or inspections and corrective actions.
If you find a trouble that is not identi-
aircraft is parked in a location
fied, or is not corrected by actions
free of high frequency radio waves
given, notify your supervisor.
that can interfere. If not sure
of conditions where aircraft is
parked, check with your super-
3-9. Troubleshooting Tests. In order
visor.
to troubleshoot your radar warning
system, you will have to run tests on
a. Overall System Test (SAM). Per-
the system using Simulator, Radar
form the procedures listed below.
Signal SM-757/APR-44(V). Simulator,
Radar Signal SM-757/APR-44(V), called
(1) Consult aircraft technical
the gun in the following paragraphs,
manual to find out where the
lets you radiate and connect rf into the
SAM antennas are located.
system. Even though one technician
can operate the gun, another technician
(2) Ask technician in cockpit to
must be in the aircraft cockpit during
make sure that system's circuit
the tests. This lets one of you operate
breaker is turned on (closed)
the gun, while the other checks for
and that POWER switch on con-
test results in the cockpit. Consult
trol unit is set to ON.
TM-11-6940-214-12 to get familiar with
the gun and its operation before using
it. Table 3-5 tells you which tests
NOTE
should be done for Radar Warning
Check and adjust position of
System AN/APR-44(V)1 and for Radar
cockpit dimmer control for visible
Warning System AN/APR-44(V)3.
edge lighting and alert indicator.
(3) Choose one SAM antenna to
start with and set gun's
The gun generates high frequency
function switch to LO BND.
radio waves that can be dangerous.
When using the gun, keep the
(4) Make sure that nothing is be-
front of it at least 2 inches away
tween you and antenna. Then,
from any part of your body.
Test Selection
Radar warning system
AN/APR-44(V)3
Test
AN/APR-44(V)1
Overall system test
Paragraphs 3-9a, 3-9b
SAM receiver threshold
(with low pass filter)
SAM receiver threshold
(without low pass filter)
Not applicable
AI receiver threshold test
3-6
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