Which terms indicate mandatory compliance in aviation documentation?

In aviation documentation, the terms that indicate mandatory compliance are "shall" and "must." These terms are used to specify requirements that must be followed without exception. When a document states that a procedure "shall" be performed or that something "must" be adhered to, it conveys a legal obligation to comply with those regulations or standards. This distinction is crucial for safety and regulatory purposes in aviation, ensuring that all parties involved in operations are clear about what is required.

Other terms like "may," "can," "ought," "should," or "will" imply a degree of guideline or suggestion rather than an obligation. By using "shall" and "must," aviation manuals, regulations, and operational guidelines create clarity around essential actions that need to be taken to maintain safety and compliance. This is particularly vital in an industry where adherence to procedures can vastly affect safety outcomes.