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To return the wipers to their static position adjacent to
the canopy frame, the WSHLD WIPER knob is turned
to PARK and held momentarily until the blades stop.
The knob is spring-loaded from PARK to OFF. The
CPG has limited control over the windshield wipers.
Normally, the W WIPER switch on the CPG ANTIICE
panel is left in the PLT position. When the switch
is set at CPG, the CPG wiper blade moves at low speed.
2.45 WIRE STRIKE PROTECTION SYSTEM (WSPS).
The WSPS (fig 2-35) consists of six cutter assemblies
and eleven deflectors. An upper cutter assembly is
mounted on top of the pilot station canopy on the left
side of the helicopter. A lower cutter assembly is
mounted on the bottom of the helicopter, forward of the
gun turret bay. A main landing gear cutter assembly is
mounted on each main landing gear strut by the lower
step on the forward side of the strut. A PNVS cutter assembly
is mounted on the top of the TADS/PNVS. A gun
turret deflector and cutter assembly is mounted on the
forward side of the gun cradle. A forward and aft deflector
are mounted on each of the pilot and CPG door
hinges. An upper wiper deflector assembly is mounted
by the upper windshield on the left forward side of the
CPG station. A lower wiper deflector assembly is
mounted by the lower windshield on the right forward
side of the CPG station. A tailboom jack pad deflector
assembly is mounted on the bottom of the tailboom just
forward of the jack pad. A tail landing gear deflector assembly
is mounted on the tail landing gear forward of
the tail wheel. The wire strike protection system is designed
to protect the helicopter from wire obstructions
at low levels of flight.
2-62
TM 1-1520-238-10
Figure 2-35. Wire Strike Protection System
2-63
TM 1-1520-238-10
Section X. HEATING, VENTILATION, COOLING, AND
ENVIRONMENTAL CONTROL SYSTEMS
2.46 ENVIRONMENTAL CONTROL SYSTEM (ECS).
2.46.1 ECS Description. Crew compartment ventilating,
heating, and air conditioning are provided by
the ECS. In addition, the ECS is the primary source of
conditioned air for the two forward avionics bays (FAB)
and the TADS/PNVS turret. The ECS is comprised of
the environmental control unit (ENCU), ECS shutoff
valve, ECS control panel, and ducting to deliver pressurized
air from the engines to the ENCU, and to route
conditioned air from the ENCU to the crew stations,
FABs, and TADS/PNVS turret. It includes an exhaust
fan for the aft avionics bay, one fan in each FAB, and
one fan in the electrical power center. The ENCU, located
on the left side of the aft equipment bay, produces
conditioned air with low moisture content. It takes hot
pressurized air from the pressurized air system and
cools it through a heat exchange and air expansion process.
The ECS shutoff valve receives 28 vdc from the
emergency dc bus through the ECS CAB circuit breaker.
The FAB fans and aft avionics bay fan receive 28 vdc
control voltage from the emergency dc bus through the
ECS CAB circuit breaker and 115 vac from the No. 2
essential ac bus through the ECS FAB FANS circuit
breaker. In addition, the electrical power center fan and
aft avionics bay fan receive 115 vac from the No. 2 essential
ac bus through the ECS AFT FAN circuit
breaker. All circuit breakers are located on the pilot
overhead circuit breaker panel. Thermal switches in
the FABs will illuminate the ECS segment on the pilot
caution/warning panel if the air temperature in either
FAB is greater than 105 °F. The aft avionics bay fan is
controlled by a separate automatic thermostat which
turns the fan on and off depending on the temperature
of the aft avionics bay.
2.46.2 ECS Normal Operation. Operation of the ECS
is by the pilot ECS control panel (fig 2-36) located on
the pilot left console (fig 2-11) and by the CPG AUX
panel (fig 2-33) located on the CPG left console (fig
2-12). Normal operation is as follows:
a. ECS Control Panel. The NORM-STBY FAN
switch is normally set at NORM. When the switch is
set to STBY FAN, the speed of the FAB fans is increased
to draw additional air from the crew stations
for avionics cooling. The CPG has a two-position STBY
FAN switch, located on the AUX panel. This switch is
normally in the OFF position to allow the pilot to control
the FAB fan speed. When the CPG switch is set to
STBY FAN, the speed of the FAB fans is increased.
Figure 2-36. ECS Control Panel
The TEMP control on the pilot ECS panel controls the
temperature of conditioned air to the crew stations,
FABS, and TADS/PNVS turret. Moving the control between
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