Under AS9100, work instruction revisions are typically controlled through the organization’s documented process for controlled documented information. The standard does not prescribe one software workflow or one approval pattern, but it does require that revisions be reviewed, approved, identified, distributed in a controlled way, and protected from unintended use of obsolete versions.
In practical terms, effective revision control usually includes:
A defined owner for creating and updating the instruction.
Formal review and approval before release, based on the significance of the change.
Unique document identification, revision level, and effective date.
A record of what changed and who approved it.
Controlled access at point of use so operators see the current approved version.
Removal, blocking, or clear identification of obsolete versions.
Assessment of downstream impact on training, process validation, tooling, inspection, router steps, and related quality records.
Yes, that can be done on paper or digitally. AS9100 does not require digital work instructions. However, paper-based control is harder to execute consistently in high-mix or multi-cell environments because the failure modes are common: printed copies linger, local binders drift from master records, redlines appear without approval, and evidence of who used which revision becomes weak.
For that reason, the real control point is not the file format. It is whether the organization can show traceability from change request to approval, release, operator access, and retirement of the prior revision. If a revision changes process parameters, inspection steps, sequence, or acceptance criteria, the organization also needs to evaluate whether additional validation, retraining, or first-piece and verification activities are required. That depends on the process and risk, and it should not be assumed to be automatic.
They generally look for objective evidence that the revision process is defined and followed, including:
The current approved revision is the one available where work is performed.
Obsolete instructions cannot be used unintentionally.
Changes were reviewed by the right functions, which may include engineering, quality, operations, and document control.
Related records and systems were updated consistently.
Personnel were informed or trained when the change affected execution or inspection.
The organization can reconstruct when a revision became effective and which lots, serial numbers, or work orders were built under it, if that traceability is required by the process or product risk.
That last point matters in regulated and long-lifecycle environments. Revision control is not just document housekeeping. It is tied to traceability, product configuration, change control, and evidence retention.
In many plants, work instruction control is split across PLM, ERP, MES, QMS, shared drives, and paper at the workstation. That is common. The risk is not merely inconvenience. It is mismatched effective dates, broken links between the released instruction and the job traveler, and uncertainty about whether training and quality checks were updated at the same time.
Full replacement of all legacy systems is often not realistic in aerospace and other regulated operations. It can fail because of qualification burden, validation cost, downtime risk, integration complexity, and the need to preserve historical traceability across long equipment and product lifecycles. A more reliable path is often controlled coexistence: define the system of record for revisions, synchronize revision status to downstream systems, and make exception handling explicit. That still requires disciplined master data, interface governance, and change control. Software alone does not fix weak process ownership.
AS9100 does not guarantee that a revision workflow is adequate just because a document has a version number or an e-signature. If approvals are routine but impact assessment is weak, if operators can still access old local copies, or if linked process and inspection documents are not updated together, the control is incomplete.
So the short answer is: work instruction revisions under AS9100 are controlled by a documented, traceable document-control process tied to change control, point-of-use availability, obsolete document prevention, and evidence that affected people and systems were updated appropriately. The exact mechanism varies by plant and system landscape.
Whether you're managing 1 site or 100, Connect 981 adapts to your environment and scales with your needs—without the complexity of traditional systems.
Whether you're managing 1 site or 100, C-981 adapts to your environment and scales with your needs—without the complexity of traditional systems.
