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indicator. The “F” informs the operator that one or more of
the systems has failed at least some portion of their respective
PBIT routines. This prompts the operator to perform
initiated built-in-test (IBIT) to determine what system(s) has
failed and the extent of the failure(s)..
j. IBIT may be selected by the operator. If the RSDS
interface circuitry within either RTU fails the self-test, the
RWR TEST FAIL advisory is displayed on the MFD.
Faulty receivers are shown on the indicator as blinking
symbols and the voice message “APR-39 Failure” will be
heard over the ICS. If the test is good, the voice message
“APR-39 Operational” will be heard over the ICS. The
RWR FAIL caution is displayed if the RSDS interface
circuitry within both RTU’s fails while in its normal operating
state. Self-test of the laser detecting set (LDS) and
the missile warning system (MWS) are incorporated in
the RSDS self-test.
k. The system interfaces with the Interference
Blanker Unit (IBU) in an attempt to prevent other aircraft
systems, which operate in the same approximate frequency
range, from interfering with it. The lo-band portion
of the RSDS is blanked by the IBU when either the IFF
transponder system or the TACAN system is transmitting.
The hi-band portion of the system is blanked by the IBU
when the radar altimeter system, radar beacon transponder
system, multimode radar system, pulse radar jammer system,
or the CW radar jammer system is transmitting. This
blanking is accomplished to prevent the possible detection
of false threats as a result of interference induced by these
systems. Because the RSDS is a passive system, it does
not provide any input to the IBU for the potential blanking of
other systems.
TM 1-1520-240-10
4-1-3
Figure 4-1-1. Radar Signal Detecting Set Indicator
4-1-2. CONTROLS AND FUNCTION, RADAR SIGNAL
DETECTING SET INDICATOR
CONTROLS/
INDICATOR
FUNCTION
MA Lamps Not used in the AN/
APR-39A(V)1 system.
BRIL Control Sets indicator display
brightness. Turn clockwise
to increase brightness.
Adjust for best
readable display of plus
(+) symbol.
MA Lamp Switch Not used in the AN/
APR-39A(V)1 system.
CONTROLS/
INDICATOR
FUNCTION
Plus (+) Symbol Displayed in the center of
indicator during operation
and self-test. Plus (+)
symbol flashes to let
operator know when the
system is operating in a
dense signal environment
and threat detection is
degraded.
Tick Marks The 12 outer edge
markings on the indicator
graticule, represent clock
positions relative to
aircraft heading.
Threat Symbol Typical Threat
TM 1-1520-240-10
4-1-4
NOTE
The concentric circle is a reference mark only
and is not a range marking.
4-1-3. Controls and Function, Radar Signal Detecting
Control.
CONTROLS/
INDICATOR
FUNCTION
PWR Switch Two position switch. At ON,
power is applied to set. Set
is operational after 1-minute
warmup.
TEST Switch Switch is spring-loaded to
off. When pressed, the self
test function is enabled.
CONTROLS/
INDICATOR
FUNCTION
MODE Switch Two position switch. Selects
synthetic voice message format.
Mode 1 (up) selects
normal message format.
Mode 2 (down) selects terse
(abbreviated) message format.
Mode 2 reduces audio
distractions when operating
in dense signal environments.
AUDIO When turned clockwise, the
audio output of the set is increased.
Figure 4-1-2. Radar Signal Detecting Set Control
4-1-4. Normal Operation — Radar Signal Detecting
Set.
This paragraph provides radar signal detecting set operating
procedures.
CAUTION
To prevent damage to the antenna detectors
(when operating) never operate the
AN/APR-39A(V)1within 60 yards of ground
based radars or within six yards of airborne
radar antennas. Operating the system
closer than these limits may damage
the antenna detectors. Allow an extra margin
for new, unusual, or high-powered radar
transmitters.
CAUTION
Excessive indicator display brightness
may damage the CRT. Set indicator BRIL
control for readable display.
a. Starting.
(1) PWR switch — ON. Allow 1 minute for warmup
– Check for synthetic voice message “APR-39
POWER UP”.
(2) BRIL control — adjust display of (+) symbol
(3) MODE switch — Select MODE 1 (up) for
normal messages. Select MODE 2 (down) for terse (abbreviated
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