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and disable error correction.
NOTE
In order to transmit and receive using the error correction mode, both the
receiving and sending ends must be configured for the same error correction
mode and the cipher mode must be selected on the FM-1 radio.
10. LAST IMAGE key Moves selection box down in VIXL List. Legend will change to
START LIST when box is in the first location.
11. NEXT IMAGE key Moves selection box up in VIXL List. Legend will change to END
LIST when box is in the last location.
Figure 4-31. VIXL LIST PAGE (Sheet 2 of 2)
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TM 1-1520-248-10
4-40. RADAR DETECTING SET AN/APR- 39 POWER UP should be heard and AVR-2A PWR ON
39A(V)1. should also be present, if installed.
a. Description. The radar detecting set AN/APR- NOTE
39A(V)1 provides the pilot with a visual and aural
warning when hostile fire control threat is encountered.
The equipment responds to hostile fire control radars Allow one minute for system warmup.
but nonthreat radars are generally excluded. The
equipment also receives missile guidance radar signals (6) R-1  Press to initiate system BIT.
and when the signals are time coincident with a radar
tracking signal, the equipment identifies the (7) SELF-TEST SET VOLUME 1 through 12
combination as an activated hostile surface-to-air  Verify synthetic voice count is heard on the headset.
missile (SAM) radar system. The visual and aural
warnings alert the pilot of potential threat so that (8) NAV B volume control knob  Adjust audio
evasive maneuvers may be initiated. level while count is taking place and verify proper
volume control operation.
b. Controls and Functions (fig. 4-32).
(9) RWR system indicator  Verify indicator
c. Operation. displays the numbers of operational flight program
(1) WPN ASE or WEAPON SEL switch  (OFP) and emitter identification data (EID).
Position to ASE.
(2) ASE SET-UP/BIT page  Verify appears on NOTE
CPG MFD.
If a receiver fault is noted, the faulty
NOTE receiver is shown as two triangles,
representing the right and left channels of
that receiver. The symbols for the faulty
• The user defined module (UDM) must be channel or channels will be flashing.
installed in the AN/APR-39A(V)1 prior to
aircraft power up. If the UDM is not (10) Indicator  Verify forward and aft receivers
installed, the radar warning indicator will triangles appear at 6 and 12 o’clock.
display a “p” after an initial BIT. An audio
message w i l l annunciate “APR-39 (11) Asterisk  Verify appearance in all four
failure.” Any subsequent strobe displays quadrants along with the system receiver status. They
on the indicator should be considered represent the AVR-2A sensors. A faulty AN/AVR-2A
unreliable. quadrant is shown as a flashing asterisk.
• If the AN/APR-39A(V)1 radar detecting
system is not installed, the legend to the (12) APR-39 OPERATIONAL  Heard on the
right of the L-1 will be blank. ICS headset at the end of a successful self-test
operation.
(3) PULSE RADAR WARN PWR  OFF. Verify
displayed on the first line to the right of L-1. (13) APR-39 FAILURE  Heard on the ICS
(4) FULL and TERSE  Verify displayed on the headset at the end of an unsuccessful self-test
third line to the right of L-1. operation.
(14) “+” symbol  After completion of self-test,
NOTE should be displayed at the center of the indicator.
AN/APR-39A(V)I mode is controlled by L-1.
(15) L-1  Select TERSE.
Successive presses of L-1 causes the AN/
APR-39A mode to toggle between FULL and
TERSE modes. (16) R-1  Press to initiate self-test.
(5) RADAR WARN circuit breaker switch  (17) SELF-TEST SET VOLUME 5 through 1 
RADAR. Verify that the legend to the right of L-1 Verify synthetic voice short count heard on the ICS
changes to PULSE RADAR WARN PWR  ON; APR- headset.
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TM 1-1520-248-10
(18) Display  Verify symbology same as in (3) NAV B volume  (CDS2) Adjust as required.
FULL mode. Adjust on ASE page.
NOTE (4) Headset  Verify low pitch tone followed by
brief high pitch tone and momentary display of MISSILE
ALERT  AI and MISSILE ALERT  SAM advisories. • (CDS2) If the ISP fails the AN/APR-
39A(V)1 will default to FULL mode. Audio
will be present but at reduced amplitude. 4-42. AN/AVR-2A LASER DETECTING SET. ASE SET-UP/BIT page w i l l display
whatever was present at the time the ISP
failed. a. Description. The laser detecting set detects,
identifies, and characterizes laser energy in four 100- • If the R MCPU fails the AN/APR- degree overlapping fields-of-view around the aircraft.
　
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