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) messages.
b. Self-test check.
NOTE
SYSTEM SELF–TEST provides a four step
test of system functions. A complete system
self-test is initiated any time the test button is
pressed. The complete system self test runs
in less than 30 seconds. The following is a
description of the system functions.
(1) TEST - As follows:
(a) MODE switch — Set position 1 (up)
(b) TEST switch — Press.
A synthetic voice long count is performed. The audio
message “SELF-TEST, SET VOLUME 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12” will be heard on the ICS.
A display of two numbers which represent the installed
software revision on the indicator; one number (OFP-Operational
Flight Program) at the top and one number
(EID-Emitter Identification Data) at the bottom (fig.
TM 1-1520-240-10
4-1-5
4-1-3). Check OFP and EID numbers are correct for theater
or mission.
Performs the Receiver and AN/AVR-2 status display.
See figure 4-1-4 for normal indicator displays, and faulty
indicator displays.
Performs a test on the synthetic voice status messages.
A no fault detected during test will end with message
APR-39 OPERATIONAL” any fault detected will end with
message “APR-39 FAILURE”, which will be heard over
the ICS.
Performs the plus (+) symbol display status. The plus (+)
symbol will be displayed, centered within the small circle
on the indicator, anytime the symbol is operational.
Figure 4-1-3. Radar Signal Detecting Set (OFP and
EID VERSION DISPLAY)
(c) MODE switch — MODE 2 (down),
(d) TEST switch — Press.
Performs the synthetic voice short count. Listen to synthetic
voice message and adjust volume. Mode 2 short
count is: “SELF-TEST SET VOLUME 5, 4, 3, 2, 1”.
(2) The following fault display conditions are on
the result of a bad self test and will result in an audio
message “APR-39 FAILURE” over the ICS.
(a) If a receiver fault is noted, faulty receiver
is shown as two triangles, (fig. 4-1-4) representing right
and left video channel (s) will be flashing.
(b) A faulty C/D band amplifier in a processor
is shown as a flashing square centered on indicator
display ( fig. 4-1-4).
(c) The Laser Detecting Set (LDS)(AN/
AVR-2) status is displayed along with the receiver status.
A faulty LDS quadrant is shown as a flashing asterisk.
LDS faults do not cause an audio message “APR-39
FAILURE”, heard over the ICS.
(d) If LDS is not installed, all four quadrants
(asterisks) will flash.
(3) Operating In A Dense Signal Environment.
(a) When a dense signal environment is detected,
the plus (+) symbol on the Radar Signal Detecting
Set (RSDS) indicator will flash, and the voice message
“THREAT DETECTION DEGRADED” will be announced
over the ICS.
(b) Position mode switch to mode 2 (terse
mode). When the plus(+) symbol stops flashing, the
voice message “THREAT DETECTION RESTORED”
will be announced over the ICS.
4-1-5. Countermeasure Set (AN/ALQ-156).
The Countermeasures Set (AN/ALQ-156) detects the
approach of anti-aircraft missiles, and signals the M-130
Flare Dispenser to launch flares to decoy the missiles
from the helicopter. The set consists of a control unit on
the console, a receiver-transmitter in the electronics
compartment, two antennas on the bottom of the fuselage,
and two caution light capsules on the master caution
panel. The set alternately applies pulsed signals to
the two antennas which radiate the signals about the
helicopter. A missile approach is detected by the frequency
shift of the transmitted signals echo returned
from the missile. Any echo is received during the interval
following each pulsed transmission. Built-in-test-equipment
monitors system operation. If a malfunction is detected,
the system is disabled and the CM INOP caution
capsule on the master caution panel will come on. Also,
if enemy jamming or interference from other countermeasures
sets is detected, the set will automatically shift
to a clear channel. The set receives AC electrical power
from the No. 2 AC bus through the MSL DET SYS circuit
breaker on the No. 2 PDP. The set receives DC power
from the No. 2 DC bus through the MSL DET SYS circuit
breaker also on the No. 2 PDP.
TM 1-1520-240-10
4-1-6
Figure 4-1-4. Radar Signal Detecting Set Indicator (Self Test Displays)
TM 1-1520-240-10
4-1-7
4-1-6. Controls and Indicators, Missile Detector Set
(AN/ALQ-156). (fig. 4-1-5)
CONTROLS /
INDICATOR
FUNCTION
　
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