Internal combustion engines shall?

When considering the operation and safety standards associated with internal combustion engines in hoisting applications, it's important to understand the implications of direct drive systems. Internal combustion engines are complex machines that can produce significant power, but they also present unique risks when not used appropriately.

When an internal combustion engine is directly connected to a load, it can lead to several safety issues, including loss of control and mechanical failure under certain conditions. Direct drive systems do not allow for the same level of control or safety mechanisms that gear systems or other means of transfer might provide. Therefore, the regulations and best practices established for hoisting are clear in prohibiting the use of internal combustion engines for direct drive to enhance operator safety and equipment reliability.

In contrast, the other choices suggest allowances or approvals that could potentially compromise safety by either encouraging use or requiring inspections that may not sufficiently mitigate risks associated with direct drive systems. Hence, focusing on prohibiting this method ensures a higher standard of safety in hoisting operations.