TM 55-1510-221-10
5. Remove expended and unexpended
impulse cartridges and flares (or chaff)
from payload module.
6. Repack unexpended items in original
containers and return to stores.
NOTE
It is not unusual for the case of a chaff
cartridge to crack when fired. It does not
effect performance of the item and should
not be reported as a malfunction.
4-6.
RADAR SIGNAL DETECTING SET (AN/APR-
39(V)1).
The radar signal detecting set (control panel, fig.
4-3) indicates the relative position of search radar
stations. Audio warning signals are applied to the
pilot’s and copilot’s headsets. The radar signal
detecting set is protected by the 7.5-ampere circuit
breaker placarded APR39, located on the mission
control panel (fig. 4-l). The associated antennas are
shown in figure 2-1. For operating instructions, refer
to TM I l-5841-283-20. Pattern # 1 self test, shall be
as shown in figure 4-4.
a.
Radar Signal Detecting Set Control Panel
Functions (AN/APR-39(V)1) (fig. 4-4).
(1.)
PWR switch. Turns set on or off.
(2.)
SELF TEST switch. Initiates self test.
(3.) DSCRM switch. Turns discriminate
function on or off.
(4.) AUDIO control. Adjusts audio level.
b.
Radar Signal Detecting Set Indicator Func-
tions (fig. 4-5).
(1.) MA indicator. Illuminates to indicate
the presence of an MA threat.
(2.)
Display. Indicates relative position of
search radar stations.
(3.) BRIL control. Adjusts brilliance,
(4.)
DA Y-NIGHT control. Rotate to adjust
intensity of display.
4-7. RADAR WARNING RECEIVER (AN/APR-44()
(V3).
The radar warning receiver (fig. 4-6) indicates
the presence of certain types of search radar signals.
1. POWER switch
2. SELF TEST switch
3. DESCRIMINATE function switch
4. AUDIO level control
AP 003891
Figure 4-4. Radar Signal Detecting Set Control Panel (AN/APR-39(V)1)
4-10
