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39A(V)1 will default to FULL mode. Audio The fields-of-view also extend 45-degrees above and
will be present but at reduced amplitude. below each sensor. Detected energy signals are
ASE SET-UP/BIT page w i l l display processed into threat messages and are transmitted to
whatever was present at the time the R the AN/APR-39 for display. The display indicates the
MCPU failed. direction of the threat to the crew. An aural warning is
also transmitted through the headsets. The AN/AVR-2A
receives power from the 28 Vdc essential bus. Circuit 4 - 4 1 . A N / A P R - 4 4 RADAR WARNING protection is provided by the RADAR WARN circuit
SYSTEM. breaker switch.
a. Description. The AN/APR-44 radar warning
system is used to detect continuous wave (CW) radar NOTE
signals, both ground (SAM threat) and airborne
interceptor (AI), aimed at the helicopter. Radar
detection is indicated by tone in the headset and • (CDS2) If the ISP fails the AN/AVR-2A will
display of the SAM/AI advisory message on the MFD. operate in the backup default mode. While
The system consists of four antennas, two receivers, a operating in the default mode the AVR-2A
low bypass filter, and a CDS interface. The system is will continue to provide normal function
powered by 28 Vdc essential bus and circuit protection with the following exceptions: Current
is provided by the RADAR DETR circuit breaker switch. system power status will not be displayed
on the ASE SET-UP/BIT page. Aural
b. Controls and Functions (fig. 4-32). warning will be reduced in amplitude.
c. Operation. • If the R MCPU fails the AN/AVR-2A
will operate in the backup default mode.
NOTE While operating in the default mode the
AVR-2A will continue to provide normal
• (CDS2) If the ISP fails the AN/APR-44 will function with the following exceptions:
default to ON. Audio will still be present Current system power status will not be
but at reduced amplitude. No advisories displayed on the ASE SET-UP/BIT page.
will display with the ISP failed. A u r a l w a r n i n g w i l l be reduced i n
amplitude.
• If the R MCPU fails the AN/APR-44
will default to ON. Audio will still be • If the AN/AVR-2A is not attached to the
present but at reduced amplitude. No AN/APR-39, all four quadrant symbols will
advisories will display with the R MCPU be flashing. This is a normal indication
failed. and does not affect system performance
(1) RADAR DETR circuit breaker switch  or self-test.
RADAR. Allow 1 minute warmup. • AN/AVR-2A faults are displayed on the
(2) CW RADAR WARN PWR  Check ON indicator, but do not cause an APR-39
displays. FAILURE message.
4-63
TM 1-1520-248-10
CONTROL/INDICATOR FUNCTION
1. MA (missile alert) lamps Flashes to indicate a missile threat.
2. Triangles Represent forward and aft receivers.
3. BRIL Control Adjusts indicator illumination.
4. ASTERISK Symbology Represent AVR-2A sensor quadrants.
5. NIGHT/DAY switch Used to change intensity of lamps for night vision goggle compatibility.
6. AVR-2 PWR Indicates power ON or OFF.
7. PULSE RADAR WARN Indicates power ON or OFF.
PWR
Figure 4-32. Radar Detector AN/APR-39A(V)1, Radar Warning AN/APR-44, and Laser Detector AN/AVR-2A
Controls and Indicators (Sheet 1 of 2)
4-64
TM 1-1520-248-10
(Cont)
CONTROL/INDICATOR FUNCTION
8. L-1 FULL provides specific threat type, threat position, and threat mode or
status.
TERSE provides general threat type, threat position, and threat mode or
status. TERSE cuts down audio distractions and would be used in dense
signal environments.
9. CW RADAR WARN PWR Indicates power ON or OFF.
10. L-4 and L-5 Volume Adjust radar warning and laser detector audio volume.
controls
11. (CDS2) NAV B Volume Adjusts radar warning and laser detector audio volume.
control
12. PULSE RADAR WARNING Initiates BIT.
BIT
13. RADAR DETR switch Switched to DETR removes power from radar detector system.
14. RADAR WARN switch Switched to WARN removes power from radar warning and laser warning
systems.
Figure 4-32. Radar Detector AN/APR-39A(V)1, Radar Warning AN/APR-44, and Laser Detector AN/AVR-2A
Controls and Indicators (Sheet 2 of 2)
b. Controls and Functions (fig. 4-32). asterisk. No audio announcement is associated with the
AN/AVR-2A self-test.
The AN/AVR-2A LDS system and the AN/APR-39A(V)1
RDR system operate as an integrated system. The AN/ (4) BRIL control  Rotate, check indicator
AVR-2A LDS system does not have its own circuit illumination.
breaker and receives its power from the AN/APR- (5) Volume  Adjust as required.
39A(V)1 circuit breaker such that the AN/AVR-2A is ON
　
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