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NOTE
Figure 6-6-2 shows the maximum cube size
which can be taken into the helicopter through
either the main cabin entrance, utility hatch,
or cargo loading ramp.
6-6-3. Main Cabin Entrance.
The main entrance door is located on the right side of the
cargo compartment at the forward end and measures 66
inches in height by 36 inches in width. The door is composed
of two sections: the upper section rolls inward and
upward to a rest position overhead; the lower section
opens outward and downward and serves as a step in the
lowered position.
6-6-4. Utility Hatch Door.
The utility hatch door is in the center of the cargo
compartment floor between stations 320 and 360. the
door is hinged along its entire forward edge. It opens
upward and forward to expose the lower rescue door and
the cargo hook. The door is unlatched by pressing the
knob labeled PUSH, and is latched by pressing the unmarked
knob.
NOTE
When opening or closing the lower rescue
door, be certain that the cargo hook is properly
stowed and supported by the restraining
straps. In addition, close the rescue door, using
the actuator only to the point where the
latch can engage; the latches will then lift the
door and compress the door seal.
6-6-5. Lower Rescue Door.
When closed, the lower rescue door forms a part of the
fuselage bottom. It is accessible through the utility hatch
door. The lower rescue door is secured by four latches
centered around the door perimeter. These latches are
connected by linkage to an actuator labeled OPEN and
CLOSED. A handcrank, stowed in spring metal clips on
the left side of the fuselage, is used to unlatch the door
and turn the gears. A drive shaft, which is turned by the
gears, moves the door actuator links. The door opens
downward and aft underneath the fuselage where it remains
during operation.
CAUTION
Although tightening of the tiedown straps
may be necessary to reduce internal load
vibrations, excessive tightening of tiedowns
attached to the outboard row of tiedown
fittings will limit the effectiveness of
the isolated cargo floor.
6-6-6. Cargo Compartment Floor.
The floor is made of extruded panels, riveted together in
sections. Raised extruded ridges, running the entire
length of the floor, provided surfaces on which cargo is
moved. The flooring in the cargo compartment contains
sections on either side of the centerline which are
strengthened to serve as vehicle treadways. The flooring
from station 200 to 400 and from buttline 44 left to 44
right, rests on rubber vibration isolators which reduce
overall internal load vibrations. Tiedown fittings (fig.
6-6-3) for securing cargo are installed in the floor. There
are also studs for attaching troop seats, litter supports,
and the base plate for the maintenance crane. The flooring
is covered with a walkway compound which provides
a non-skid surface for personnel and for vehicles. In
construction, the ramp floor is identical with the cargo
floor.
NOTE
Whenever possible, place all wheeled vehicles
entirely on the treadways between stations
200 and 400.
6-6-7. Strength Areas.
The weight which the cargo compartment floor (fig.
6-6-4) can support varies. These variations are largely
due to difference in strength of supporting frames and
fuselage construction, not because of varying floor
strength. To gain the maximum benefit from the cargo
compartment floor, the following definitions and weight
limitations must be observed.
TM 1-1520-240-10
6-6-2
6-6-8. Uniformly Distributed Loads.
Uniformly distributed loads are those loads wherein the
total weight of the item is equally spread over the item’s
entire contact area. Contact area is large compared to
size and weight of the load.
6-6-9. Uniformly Distributed Load Limits.
Compartments C, D, and E (fig 6-6-4) are limited to 300
psf. The cargo loading ramp (fig. 6-6-4) is limited to 300
psf with a maximum total load of 3,000 pounds when the
ramp is level with the cargo floor.
TM 1-1520-240-10
6-6-3
Figure 6-6-1. Cargo Compartment Dimensions
TM 1-1520-240-10
6-6-4
Figure 6-6-2. Maximum Package Size (Sheet 1 of 3)
6-6-10. Concentrated Loads.
Concentrated loads are those loads wherein the total
weight of the item is supported by a contact area that is
small compared to the size and weight of the load.
6-6-11. Concentrated Load Limits.
Concentrated loads can be loaded on the treadways and
on the walkway. The treadways aft of station 160 and
ramp extensions are stressed for a total wheel load of
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