Figure 6-6-11. Cargo Door Cranking
6-6-42. Load Planning.
Before loading cargo, the placement of individual items
of cargo in the helicopter should be planned and then
checked to determine if the planned arrangement falls
within the C.G. limits. there are three basic steps involved
in load planning. The first step is to decide which method
will be used to compute C.G. of the load. If the compart-
ment method is to be used, each item of cargo must be
assigned a location in one of the three compartments. If
the station method is to be used, specific station loca-
tions must be assigned to each item of cargo. The sec-
ond step is to compute the C.G. of the load. If the load
consists of a number of items of cargo, the compartment
method should be used. If the load consists of only a few
bulky items, the station method should be used. The third
step is to check if the C.G. falls within the allowable limits.
If it does, the cargo can be loaded; if not, the location of
individual items should be rearranged until an acceptable
loading plan is obtained.
6-6-43. Compartment Loading.
Loading by compartments provides a rapid means of
computing the C.G. of a load and can be used whenever
the cargo load consists of a number of items. The heli-
copter cargo compartment is divided into three compart-
ments (fig. 6-6-12). The centroid, or center of balance, of
each compartment is located at station 181, 303, and
425, respectively. When using the compartment method,
it is assumed that the weight of all the cargo in the
compartment is concentrated at the centroid of the
compartment. If an item of cargo extends into two or
three compartments, the weight of the item should be
proportionately distributed in each compartment. The
C.G. of the cargo load is computed as follows:
Record the weight of cargo in each compart-
b. Calculate the compartment moment by multiply-
ing the total weight in each compartment by the station
number of the compartment centroid.
Add the compartment moments.
Add the weight in all compartments.
Divide the sums of the cargo moments by the total
weight of the cargo. The result is the arm or the C.G.
location of the load.
6-6-44. Station Loading.
Loading by stations provides a more precise method of
computing the C.G. of a load and should be used when-
ever possible (fig. 6-6-13). To use this method, it is nec-
essary to know the C.G. of each item of cargo. If the C.G.
of an item is not marked, it can be determined by the
procedure given in TM 10-450-2. Station loading re-
quires that the C.G. of each item placed on the helicopter
coincides with a fuselage station number. The C.G. of the
load is calculated as follows:
Record the weight and station number of each
item of cargo.
Calculate the moment of each item by multiplying
the weight of the item by the station number of its C.G.
Add the moment of each item to obtain the total
Add the weights of each item to obtain the total
Divide the total load moment by the total load
weight to obtain the arm or the C.G. location of the load.
6-6-45. Vehicle Loading.
The same procedures observed in cargo loading apply
to vehicle loading.
Shoring is used to protect the cargo floor and to distribute
load pressure over a greater area of the floor. Shoring
can often make the difference between being able to
carry a given load and not being able to; however, it is
important not to exaggerate the effectiveness of shoring.
Some vehicles have a tread width too narrow to allow the
wheels to rest on the treadways. In this case, shoring
must be used to reduce the contact pressure on the
walkway to an allowable figure. In general, shoring is
required for all wheeled platforms and dollies and for any
item of cargo whose contact pressure exceeds the floor