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Table 3-3. Preventive Maintenance Checks and Services Electrical
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TM-9-1270-212-14-P Fire Control Subsystem Helmet Directed XM128 P/N 2277716-00 NSN 1270-00-122-9449 Manual
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Section VI. MAINTENANCE OF HELMET SIGHT ASSEMBLY
TM 9-1270-212-l4&P
Section V. TROUBLESHOOTING
3-9. BIT Test.
Assembly Troubleshooting.
3-10. Helmet Sight
a. Perform the BIT test as follows:
-
NOTE
(1) Insure that the circuit breakers and switches are
In the procedures below, where the nomencla-
set as specified in paragraph 2-4 for proper helicopter
ture of a control, control position, or indicator
configuration.
differs between the AH-1S(Mod) and the
helicopters, the basic nomen-
(2) Place both the gunner and pilot linkage
clature used is that for the AH-1S(Mod) heli-
assemblies in the BIT position (fig. 2-11).
copter and the nomenclature for the AH-1S
helicopters follows, in parentheses
(3) Actuate the BIT switch on the gunner armament
and prefixed with an "or" for example, "HSS
control panel.
RETICLE TEST (HSS RTCL TEST or HSS
L A M P TEST)" in a(3) b e l o w .
When the failure indication occurs, insure that the
b.
linkages are properly attached to the BIT magnets and
check all cable connections. Then repeat the BIT test as
The troubleshooting consists of a test of the reticle light
follows:
using helicopter power and an electrical eyepiece retraction
test.
(1) Cycle the MASTER ARM switch on the pilot
armament control panel from STBY to OFF and back to
a. Reticle Light Test Using Helicopter Power. Perform
STBY.
the reticle light test using helicopter power as follows:
(2) Actuate the BIT switch on the gunner armament
(1) Insure that the MASTER ARM switch on the -
control panel. If the failure still exists, refer to table 3-4 for
pilot armament control panel is in the STBY position.
the assembly to be replaced.
Table 3-4. BIT Test Troubleshooting Procedures
BIT failure
Corrective action
Probable cause of failure
indication
a. Electronic interface assembly
Replace the EIA (paragraph 3-15).
1. PLT
b. Pilot linkage assembly
Notify DS/GS maintenance personnel.
a. Electronic interface assembly
Replace the EIA (paragraph 3-15).
2. GNR
b. Gunner linkage assembly
Notify DS/GS maintenance personnel.
c. Extension cable
Notify DS/GS maintenance personnel.
Electronic interface assembly
Check connectors, then replace the EIA (paragraph
3. INTFC (or EIA)
3-15).

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