TM 55-1520-240-23-10
16-59.30 STRAY VOLTAGE TEST PROCEDURES
16-59.30
INITIAL SETUP
Applicable Configurations:
All
Tools:
Electronic Equipment Tool Kit,
NSN 5180-00-064-5178
Countermeasures Dispenser Test Set Assembly
(CDTS)
Torque Wrench, 5-50 Inch-Pounds
Materials:
None
Personnel Required:
Avionics Mechanic (2)
Equipment Condition:
Aircraft Power On (As Required)
Battery Connected
Hydraulic Power Off
WARNING
If CMDS is loaded with expendables,
they must be downloaded prior to
test. Ensure safety pin is installed
in safety switch and safety pin flag
is prominently displayed. Failure to
comply could result in death or injury
to personnel or damage to equipment.
NOTE
The settings of the sequencer
switches are critical for proper CMDS
operation.
1.
Ensure sequencer switches are set as follows:
LH (No. 1) Sequencer — 1A
RH (No. 2) Sequencer — 2A
2.
Apply +28 vdc to CMDS.
3.
Set DCDU MODE and JETTISON switches to
OFF.
4.
Remove all payload modules from CMDS
dispensers per Task 16-59.12.
5.
Set CDT MODE switch to FIRE TEST position.
CDT will perform BIT and display either PASS
or FAIL.
6.
Set CDT MODE switch to OFF, then install CDT
into dispenser being tested. Torque bolts to 40
inch-pounds.
7.
Set CDT MODE switch to S. V. Wait for CDT
display to read PASS.
8.
If FAIL message followed by failed pin numbers
is displayed, stray voltage exists on the CMDS
dispense fire lines indicated and must be
corrected before payload modules can be
installed. Shut down aircraft power. Starting at
the dispenser pins, use multimeter to locate the
source of the stray voltage. If CMDS is not the
source of the stray voltage, the aircraft wiring
must be checked to locate and repair the stray
voltage condition. After repairs, repeat this
procedure and retest until all lines pass.
9.
Set CDT MODE switch to OFF.
10.
Set CDT encoder pins as follows:
ENCODER PIN
LOCATION
DISP.
NO.
AIRCRAFT
LOCATION
MAG
ID
S2
S3
S4
S5
1
LH LOWER
1
X
O
O
O
2
RH LOWER
8
O
O
O
X
3
LH UPPER
1
X
O
O
O
4
RH UPPER
8
O
O
O
O
X = Coding Pin Installed
O = Coding Pin Not Installed
11.
Set DCDU MODE switch to STBY.
12.
Once expendable inventory is displayed on
DCDU, press and release DCDU ENT/BIT switch
to initiate BIT. Verify that no failure conditions
are reported via DCDU display. When BIT is
completed, check that expendable inventory is
displayed on DCDU.
13.
Set CDT MODE switch to S.V. Wait for CDT
display to read PASS.
Change 1
16-250.57
