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2,500 pounds. The treadways forward of station1 60 and
the walkway can be loaded to a total wheel load of 1,000
pounds. Concentrated loads are not to exceed 75 psi for
pneumatic tires or 50 psi for block or roller type wheels.
NOTE
The above floor loading limitations apply to
the static weight of the item prior to applying
any restraint devises.
NOTE
The minimum distance, in feet, between the
centers of any two adjacent concentrated
loads is determined by totaling the adjacent
loads and dividing by 1,000.
6-6-12. Load limits.
Vehicles exceeding the limitations may be loaded with
the use of shoring, provided that the vehicle weights
remain within the operating weight limits of the helicopter.
In cases where the wheels of a vehicle cannot rest on
both treadways because of a narrow wheel tread, shoring
must be used to spread the load over the treadways.
General cargo must not exceed floor pressure of 300 psf.
An easy way to determine floor pressure of various loads
is to divide the weight of the load by the contact area (in
square inches or square feet).
NOTE
Load on pallets supported by the longitudinal
beams or skids resting on the floor can result
in concentrated loads at points where the
beam/skid rests on or crosses floor formers.
The concentrated load can be determined by
dividing the weight of the item by the number
of floor former/skid intersection points or by
the number of locations where the skid rests
TM 1-1520-240-10
6-6-5
on the floor formers. The floor limits are the
same as the concentrated load limits in the
treadway and center section of the floor, that
is 2,500 pounds and 1,000 pounds.
6-6-13. Compartment Identification.
The cargo compartment is divided, for weight and balance
purposes, into three compartments designated
C,D, and E, running fore and aft. (fig. 6-6-1). When the
cargo ramp is used as an extension of the cargo compartment,
it is designated as F for weight and balance purposes.
These compartment designations and their limiting
fuselage stations are stenciled on the cargo compartment
walls.
Figure 6-6-2. Maximum Package Size (Sheet 2 of 3)
6-6-14. Compartment Capacities.
Based on a maximum distributed floor loading of 300 psf,
the compartment capacities can be obtained by multiplying
the floor loading by the floor area of the individual
compartment; however, this weight may exceed present
limitations. Figure 6-6-4 lists the maximum capacity of
each compartment. In addition to the limitations in figure
6-6-4, compartment loads will be limited by those limitations
set forth in Chapter 5.
6-6-15. Tiedown Fittings.
Tiedown fittings (fig. 6-6-3) for securing cargo are
installed on the cargo compartment floor and on the ramp
floor. All the fittings are D-ring types. There are 87
5,000-pound-capacity tiedown rings (83 in the fuselage
floor and 4 in the ramp floor) and eight 10,000-pound-capacity
tiedown fittings. The fittings are normally used with
tiedown devices which will not exceed the limits of the
fitting.
6-6-16. Five Thousand-Pound Capacity Tiedown Fittings.
The 83 5,000-pound-capacity tiedown fittings in the cargo
compartment floor are equally spaced in five rows
spaced 20 inches apart longitudinally. The four in the
ramp are in a rectangular pattern. Each 5,000-pound-capacity
fitting swivels freely and is capable of resisting a
single maximum load of 5,000 pounds exerted along any
radius of a hemisphere, the flat side of which is the surTM
1-1520-240-10
6-6-6
face of the floor. The fittings are hinged so that they can
be seated in floor recesses when not in use.
WARNING
The 10,000-pound-capacity tiedown fittings
must be screwed into the threaded
receptacles to full depth to achieve their
rated capacity.
6-6-17. Ten Thousand-Pound-Capacity Tiedown Fittings.
There are eight 10,000–pound-capacity tiedown fittings
on the cargo compartment floor. Four fittings are interposed
along both outboard rows of 5,000-pound-capacity
fittings, spaced at intervals of 80 inches from station
240 to station 480. These fittings are not always used and
they might be in the way when installed, therefor install
only when necessary. When they are to be used, the
fittings are screwed into threaded receptacles, at the
fitting locations. When the fittings are not being used,
threaded plugs are screwed into the receptacles to protect
the thread in the receptacles.
6-6-18. Cargo Loading Aids.
The helicopter has a number of features to facilitate loading
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