When is it acceptable to substitute common hand tools without SPMIG?

In the context of Navy 3-M 303, substituting common hand tools without SPMIG (Standard Procedure for Material Import/Export) is acceptable when the tools meet the basic form, fit, and function requirements. This means that if a substituted tool can perform the same job effectively and safely, it can be used even without prior formal approval or documentation through SPMIG.

The reasoning behind this is rooted in operational flexibility and efficiency. In certain situations, having the ability to quickly replace a common hand tool can prevent delays in maintenance or operations. The key consideration is ensuring that the substitute tool does not compromise safety or efficiency by meeting the established criteria of form (shape and physical characteristics), fit (ability to be used in the same context), and function (capability to perform the task).

This approach acknowledges that in some circumstances, such as during critical operations, an immediate solution is necessary while still prioritizing safe and effective tool usage. In contrast, other choices may introduce unnecessary constraints or do not align with the practical needs described in SPMIG guidelines.