Pick the method for the problem, not for the form (B04). A single chain of events gets a careful 5 Whys (B06). Several possible causes get a fishbone (B07) and a test of each against the data (B05). Customer escapes, repeats, safety issues and problems that cross departments get a full 8D with a team (B03).
Every investigation ends with two causes: the root cause, why the problem was made, and the escape cause, why it wasn't caught. Neither is accepted until it is confirmed with data and names a condition of the process, not a person.
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A management aid, not certification or a registrar audit. Using it does not by itself show conformity to AS9100D or any other standard, and your customers' requirements may add to it.
Clause numbers refer to AS9100D (SAE AS9100 Rev D) unless another document is named. The standards' text is not reproduced here: use your own licensed copy.
Aegis Insights are our own guidance, labeled wherever they appear: how we approach this work, not a requirement of any standard or customer.