This Standard provides the Contractor with guidance for compliance with the requirements, thereby supporting the MOD in meeting their obligations with regard to the management of Risk to Life associated with the operation of military systems. This Standard considers that a product can be an engineering artefact, whether physical Data or software, from the small scale, such as a pump or a digital map, to the large scale, such as a ship or a geographically distributed logistics application. This Standard considers that a system is a combination of elements, with defined boundaries which are used together in a defined operating environment to perform a given task or achieve a specific purpose. This Standard considers a Service to be any activity using a System, eg providing air-to-air refuelling, running a naval dockyard or calculating the safe flight envelope for an aircraft, which are provided by the Contractor.

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With a focus on greater clarity in guidance and increased alignment between procedures and severities, DEF STAN Issue 5 provides a more streamlined testing process to both manufacturers and test providers.

It covers a comprehensive range of test methods, including mechanical durability, environmental simulation, chemical exposure and climatic changes.

In this most recent issue, DEF STAN contains additional guidelines about test sequences, updates to terminology and categorization, changes to formatting, and consolidation of test sections. While most of the test methods have remained the same, many have been combined and sequenced to optimize efficiency and cost-effectiveness.

DEF STAN Issue 5 changes the way that test sections are organized, as well as creating a more meaningful system for matching severities with procedures. Although most of these updates are largely administrative, they represent a shift in the way environmental standards are defined, managed and reported.

What you need to know: There are significant changes to the layout of the standard, how tests are defined and classified, and how procedures are written. How this affects testing: Because some sections of the standard have been realigned, reclassified or even omitted, there may be slight changes to the way test reports are organized.

What you need to know: Most of the changes in this section affect the level of guidance that is given to both manufacturers and test houses about test set ups and criteria. How this affects testing: Because this update specifies sequences for environmental testing, there may be changes to the order of testing, and what methods may be performed together.

From creating alignment between defense and commercial standards to streamlining test methods and severities, the update provides for greater efficiency in testing and reporting.

In addition to separating test methods from default severities and combining similar test procedures, all methods have been rewritten in a single, consistent format. How this affects testing: Because redundant or similar procedures have been combined, the time and cost associated with testing may decrease depending on the program.

Test procedures will also have clear definitions and guidance for outlining, performing the test, and verifying test results. Additionally, since test methods and severities have been separated, different combinations can be tested that make more sense for different types of material and usage. Part 4 Natural Environments Revisions to Part 4 include additional chapters that outline evaluation criteria for materiel exposed to climatic conditions.

What you need to know: The new chapters of Part 4 include additional requirements and guidance for testing equipment under naturally-occurring environmental conditions. What you need to know: Part 5 provides new and updated information about evaluation criteria, measurement guidelines and test severities. How this affects testing: Depending on the type of product being tested, there may be updates to the way that mechanical environments are set up and how results are measured.

Several tests were added to Part 4 and integrated into existing methods. Changes in the standard will allow materiel to be tested against severities that make the most sense for the method being used, and provides greater flexibility for combining methods that can be completed in tandem.

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