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Figure 2-9. TOW control panel (located on gunner instrument panel)
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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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Figure 2-10. Linkage assembly - use of stow position
TM 9-1270-212-14&P
Section II. OPERATIONAL CHECKS
AH-lS
2-3. General.
AH-1S(Mod)
helicopter
helicopter
The operational checks test the HSS and the associated
TOW PWR
TOW PWR
armament subsystem. Refer to figures 2-1 through 2-15 for
locations of switches, circuit breakers, and other controls.
REF XFMR
REF XFMR (2)
HSS
HSS PWR
2-4. Preliminary Switch Settings.
TURRET CONT
WEAPON SIGHT
Before turning on the armament subsystem, set the
WPN CONT
associated panel switches as follows:
WPN FIRE
a. On the electrical power panel, set the INV switch to
MAIN or STBY (AH-1S(Mod) and AH-IS
helicopters)
AH-1S(
)
or ALTNR to ON (AH-1 S
helicopters).
helicopter
b. On the dc circuit breaker panel, press the following
REF XFMR
circuit breakers:
TURRET PWR
HSS PWR
AH-1Q/AH-lS(Mod)
AH-1S
TMS PWR
helicopter
helicopter
WPN CONTR
WPN FIRE
INV MAIN
INV MAIN
d. Connect an external 28-volt power and hydraulic
DC VOLT METER
DC VM
supply to the helicopter. Refer to TM 55-1520-234-10 for
GEN BUS RESET
GEN BUS RESET
the AH-1S(Mod) helicopter. and to TM 55-1 520-236/
239-10 for the AH-1S
helicopters.
GEN FIELD
GEN FIELD
,
WPNS FIRE
CAUT LT
2-5. Built-in-Test (BIT) Procedures.
TURRET PWR
NOTE
CAUTION LT
The procedures below, where the nomen-
AH-1S(
)
clature of a control, control position, or indi-
helicopter
cator differs between the AH-lS(Mod) and AH-
1S
helicopters, the basic nomen-
INV
clature used is that for the AH-1 S(Mod) heli -
DC VM
copter and the nomenclature for the AH-1S
GEN BUS RESET
helicopters follows, in parentheses
GEN FIELD
and prefixed with an "or;" for example, "HS
CAUT LT
RTCL OFF BRT (or HSS RTCL OFF BRT)"
in a below.
c. On thc ac circuit breaker panel (in the AH-lS(Mod)
helicopter) or ac and armament circuit breaker panel (in the
a. On the pilot armament control panel, set the switches
AH-1S
h helicopters), press the following circuit
as follows:
breakers.
MASTER ARM to OFF
WPN CONT (or WPN CONTR) to GUNNER
TURRET to BOTH

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