TM 1-1520-238-10
4-76
Change 5
4.38.2 AN/APR-39A(V)1 Radar Warning Display Con-
trols.
The operating controls of the RW display, located
on the right side of the pilot instrument panel (fig 2-9 and
4-24), are described in table 4-26. The display shows the
+ symbol.
4.38.3 AN/APR-39A(V)1 Operation Modes.
The RW
set may be operated in either MODE 1 or MODE 2. The
RW set receives 28 vdc from the emergency dc bus
through the RDR WARN circuit breaker on the pilot over-
head circuit breaker panel. The RW set is not monitored
by FD/LS.
a. MODE 1 Operation.
By selecting MODE 1 nor-
mal synthetic voice messages will be heard when an emit-
ter has been processed (ie. RW will announce; SA, SA-8
TWELVE O’CLOCK TRACKING). Selection of this mode
does not have any effect on emitters received, processed,
or displayed. It only affects synthetic voice audio.
b. MODE 2 Operation.
By selecting MODE 2 terse
or abbreviated synthetic voice messages will be heard (ie.
RW will announce; MISSILE, MISSILE TWELVE
O’CLOCK TRACKING).
Symbol generation and position relative to the center of
the RW display shows threat lethality. It does not show or
represent any lethality of range but of condition/mode of
the emitter. Highest priority threats (most lethal) are
shown nearest the center. Each symbol defines a generic
threat type. The definition of what the symbols mean is
classified. The complete set of symbols and definitions
are contained in TM 11-5841-294-30-2.
M01-0306
MA LAMPS
(NOT USED)
MA LAMP SWITCH
(NOT USED)
Figure 4-24.
Radar Warning Display
4.38.4 AN/APR-39A(V)1 Self-Test Operation.
Pro-
vides a GO/NO-GO test of system functions. Self-test can
be run at anytime. The complete self-test runs in less than
30 seconds. When installed, the AN/AVR-2A(V)1 laser de-
tecting set is tested simultaneously when the AN/
APR-39A(V)1 radar warning system is tested.
a. Self-test procedures are as follows:
1. PWR switch – ON. Listen for synthetic voice
message – APR 39 POWER UP.
2. MODE switch – 1 or 2 position.
MODE 1 provides long count for self-test.
MODE 2 provides short count for self-test.
Table 4-26.
AN/APR-39A(V)1 Radar Warning Display (CRT) Control/Indicator Functions
Control/Indicator
Function
BRIL Control
Adjust CRT display brightness.
MA Indicator
Not Used.
NIGHT/DAY Switch
Not Used.
