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mounted turbo-shaft engines. Power is supplied
to the main transmission through engine- mounted
nose gearboxes, shafts, and overrunning
clutches. The main transmission drives the main and X
tail rotors and accessory gearbox.
2.3 SPECIAL MISSION KITS.
The helicopter can be equipped with an IR jammer kit,
radar jammer kit, radar warning kit, winterization kit,
chaff kit, and extended range kit. Refer to the applicable
system for descriptive information.
2.4 PRINCIPAL DIMENSIONS.
Figure 2-3 illustrates principal helicopter dimensions.
2.5 TURNING RADIUS AND GROUND CLEARANCE.
Figure 2-4 illustrates helicopter turning radius and ground
clearance.
2.6 DANGER AREAS.
2.6.1 Shaded Areas Illustrated. The illustrated shaded
areas (fig 2-5) can be hazardous. Personnel approaching
an operating helicopter must do so at a 45-
degree angle from the front. The approach must be
made from well outside the rotor disc area until recognition
is received from the pilot. The pilot will then signal
when closer approach is safe.
2.6.2 Air Flow. Air flow from the tail rotor and downwash
from the main rotor are dangerous, even outside
the turning radius of the helicopter when it is in hover or
operating at takeoff power.
2.6.3 Exhaust Gases. Exhaust gases from the helicopter
engines and auxiliary power unit (APU) can cause
burns. Personnel should remain clear of these areas.
2.6.4 Canopy Jettison. During canopy jettison, acrylic
fragments will be propelled approximately 50 feet from
the helicopter. Personnel approaching a crash-damaged
helicopter shall look for a signal from the crew that closer
approach is safe.
Change 3 2-1
TM 1-1520-238-10
2.6.5 Laser. The laser shall be given special safety
considerations because of the extreme danger involved
during its operation. Relatively low laser light levels
can cause permanent damage to eyes and skin burns.
There is an additional danger of electrical shock horn
laser components.
2.7 EQUIPMENT STOWAGE COMPARTMENTS.
The aft storage bay (fig 2-2) is for the stowage of tie
down devices, protective covers, and other helicopter
equipment. The loading conditions for this bay are covered
in Chapter 6, Weight/Balance and Loading. The
survival equipment storage bay (fig 2-2) is large enough
to store a combat helmet, an environmental survival
kit, a survival weapon, and a box of field-type rations
for each crewmember. The loading limitations for this
bay are covered in Chapter 6, Weight/Balance and
Loading.
2.8 WINDSHIELD AND CANOPY PANELS.
2.8.1 Windshield. The windshield consists of two
heated laminated glass windshields. One is directly forward
of the CPG; the other is directly above his head.
The canopy consists of five acrylic panels: Two on each
side of the crew stations and one directly above the pilot.
2.8.2 Canopy Panels. The two canopy panels on the
right are independently hinged. They latch and unlatch
separately by interior or exterior handles. They swing
upward to provide entrance to, and exit from, the crew
station. Failure to properly close either canopy causes
the CANOPY caution light on the pilot caution/warning
panel (fig 2-7) to illuminate. The two canopy panels
on the left side are fixed and do not open.
2.8.3 Canopy Jettison System. The canopy jettison
system provides rapid egress paths when the helicopter
access door(s) are jammed or blocked. It consists of
three CANOPY JETTISON handles and detonation
cords installed around the periphery of each of the four
acrylic side panels on the sides of the pilot and CPG stations.
The pilot handle (fig 2-1) is located at the upper
left corner of the pilot instrument panel (fig 2-7). The
CPG handle (fig 2-1) is located at the upper left corner
of the CPG panel (fig 2-8). The external ground crew
handle is located under a quick-release panel directly
forward of the CPG windshield (fig 2-2). When operated,
the system severs the four side panels. To arm the
system, a CANOPY JETTISON handle is rotated 90°
left or right, which uncovers the word ARMED on both
sides of the handle. To activate the system, the rotated
CANOPY JETTISON handle is pushed in, detonating
a primer/initiator within the handle. The primer/initiator
ignites the detonation cord which, in turn, ignites
and burns around the periphery of the side panels. The
burning action cuts a fine line around the side panels,
severing them from the fuselage.
Figure 2-1. Canopy Jettison Handle
2-2
TM 1-1520-238-10
Figure 2-2. General Arrangement (Sheet 1 of 2)
2-3
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