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whenever the AN/APR-39A(V)1 is ON. The AN/AVR-2A
shares the AN/APR-39A(V)1 RDR system’s control and 4 - 4 3 . A N / A L Q - 1 4 4 I R J A M M E R
display. Both systems are self-test simultaneously. The COUNTERMEASURES SET.
results of the combined self-test are displayed on the
AN/APR-39A(V)1 RDR display indicator. a. Description. The IR countermeasures set
protects the aircraft from infrared heat seeking missiles.
c. Operation. The AN/ALQ-144 transmitter generates IR energy,
(1) RADAR WARN switch  RADAR. Allow 1
minute warmup.
(2) AVR-2 PWR  Check ON displays.
(3) PULSE RADAR WARNING BIT switch 
Press. Four asterisks will appear simultaneously. A
faulty AN/AVR-2A quadrant is shown as a flashing
4-65
TM 1-1520-248-10
modulates it, then passes it through the covert window radiation for longer than 10 seconds at a
in the form of invisible IR energy. distance less than 4 inches shall be
avoided.
WARNING CAUTION
The AN/ALQ-144 set should remain on for
• High voltage, sufficient to cause injury a minimum of 15 minutes; otherwise, life
o f t h e source may be d r a s t i c a l l y
or death, is used in the operation of shortened.
this equipment. Make sure personnel
observe safety precautions.
NOTE
• Operation of the AN/ALQ-144 set
g e n e r a t e s h i g h n o i s e l e v e l s ,
particularly if used in enclosed areas. • The AN/ALQ-144 i s an a c t i v e I R
Protective ear muffs or plugs should countermeasure system that is separate
be used if operating the AN/ALQ-144 from the AN/APR-44 radar warning
set for extended periods. system.
• Some s u r f a c e s o f t h e T - 1 3 6 0 • The area adjacent to R-2 is unused for
transmitter operate at temperatures text entry. Pressing R-2 does not affect
approximately 140 °F (60 °C) higher the IR jammer. The system is either on or
than local ambient, and care should be off; all actions are automatic.
taken to avoid inadvertent contact. The
r a d i a t i n g p o r t i o n o f t h e T-1360
transmitter should not be viewed 1. IR JAMMER BASE switch  IR JAMMER.
continuously during operation for any
period exceeding 1 minute from any
2. IR JAMMER XMTR switch  XMTR.
distance of less than 3 feet.
b. AN/ALQ-144 IR Jammer Set Controls and 3. Allow 1-minute warmup.
Indicators (fig. 4-33).
4. IR JAMMER PWR  Check ON displays.
c. Operation.
5. IR JAMMER XMTR switch  BASE.
WARNING
6. Allow 1-minute cool down.
Do not continuously look at the infrared
7. IR JAMMER PWR  Check OFF displays.
countermeasure transmitter (fig. 2-2)
during operation, or for a period of over 1
minute from a distance of less than 3 8. IR JAMMER PWR  Check INOP advisory
feet. Skin exposure to countermeasure displays.
4-66
TM 1-1520-248-10
FUZZ
BNR
5
OFF OFF OFF
CARGO
HOOK
FUEL
BOOST
ENG
ANTI
ICE
AUTO
ENG OIL
BYPASS
START OFF RESET
OFF
OFF
PREHEAT
RUN
ESNTL BUS
AC GEN DC GEN BATT 2 BATT 1
IR
JAMMER
BASE
IR JAMMER
XMTR
OFF
1
2
3
4
OVERHEAD CONSOLE PANELS
406075-1573-19
J1257
CONTROL/INDICATOR FUNCTION
1. IR JAMMER BASE switch Switched to IR JAMMER allows electrical power to IR JAMMER base.
2. IR JAMMER XMTR switch Switched to XMTR powers IR JAMMER XMTR. Switched to IR JAMMER
for cool down and power OFF.
3. IR JAMMER PWR “MFD Indicates AN/ALQ-144 system:
display”
OFF  Power removed from AN/ALQ-144.
ON  AN/ALQ-144 system operational.
4. L-4 and L-5 volume control Adjusts radar warning and laser detector audio volume.
Figure 4-33. AN/ALQ-144 IR Jammer Set Controls and Indicators
4-67
TM 1-1520-248-10
SECTION II. ARMAMENT
4-44. ARMAMENT SYSTEMS. inside the cockpit at the same time.
The pilot shall divide his attention
The OH-58D armament system consists of the following between the MFD symbology and
assemblies and subsystems: m a i n t a i n i n g a i r c r a f t o b s t a c l e
avoidance.
1. Pilot cyclic grip switches.
MFD Weapons Displays include; Weapons BIT and
2. CPG auxiliary control panel. setup pages, Weapons VSDs and Weapons Sparse
VSDs. The Weapons BIT and Setup pages are used to
3. MFD Weapons Displayed. program and test each of the installed weapon
systems. The Weapons VSDs and Weapons Sparse
VSDs provide weapon status and targeting symbology
4. Pilot display unit (PDU).
for each of the installed weapon systems.
　
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