Compare the intended geometry

Use a drawing, manufacturer reference image or confirmed construction description for that blade revision. A similar line on another model is weak evidence because edge construction can differ. Identify whether the observed feature has changed from earlier images of the same location. A continuous straight line and a local interruption need different questions, particularly if the changed area follows an impact or appears alongside lifted material.

Look for independent signs of discontinuity

Useful evidence includes a visible opening, uneven edge alignment, exposed material or fluid emerging at the line. None should be created by pressing, flexing or prying the blade. A photograph can locate the concern but usually cannot prove the state of an internal bond. The responsible composite specialist should decide whether a suitable inspection method is necessary to evaluate an unresolved edge or bond-line concern.

A line matching the intended seam location can still develop damage along that seam later. Conversely, a visible seam can remain an intended feature. The comparison must therefore address the present condition of the feature, rather than only confirm that a seam exists there.

Ask a construction-specific question

The enquiry should ask whether this precise feature is intended and what examination distinguishes it from damage. If its condition cannot be established, the uncertainty must remain visible in the operating decision. Filling or painting the line before assessment can conceal useful evidence without resolving its cause. No MARSTON blade seam design or allowable edge-opening limit is asserted; acceptance requires the applicable construction and assessment criteria.