OPERATION UNDER USUAL CONDITIONS
This work package provides instructions on operating the semitrailer under usual conditions.
Types of loads, load distribution, and Center of Gravity (CG) are included in this work package.
For operating instructions under unusual conditions, refer to (WP 0006).
Before, during, and after operation, perform applicable Operator Preventive Maintenance Checks and
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TYPES OF LOADS
Improper load placement can have a detrimental effect on braking, evasive maneuvers,
and handling characteristics of a towing vehicle semitrailer vehicular combination. Failure
to comply may result in death or injury to personnel. Seek medical attention in the event of
The following provides descriptions of loads and information on proper load placement.
Concentrated Loads. A load that is localized over a short distance is a concentrated load. Semitrailer
frame members are subject to damage or yielding when subjected to concentrated loads beyond their
capacity. Generally, avoid knife-edged interfaces between the load and the semitrailer. Load spreading
devices such as timbers or steel beams are recommended when this type of interface exists.
Distributed Loads. A load that bears continuously along its length of engagement with the semitrailer is
a distributed load.
Self-Supporting Loads. A load that has its own rigid base is considered to be a self-supported load. It
may also be referred to as a "rigid load" or "rigid base load."
Compound Loads. A load that is a combination of two or more types of loads on one semitrailer is
considered to be a compound load.