In aviation documents, which term indicates optional compliance?

The term that indicates optional compliance in aviation documents is "may." This word suggests that a particular action is permitted but not required. In regulatory and procedural contexts within aviation, "may" is used to indicate an option or a suggestion that an operator can choose to follow, but it does not impose a strict obligation.

For instance, a document might state that operators may follow a specific procedure if they choose, allowing flexibility for different operational practices. This contrasts with terms like "shall" or "must," which denote mandatory actions that must be taken without exception. Consequently, when interpreting aviation regulations and guidance materials, understanding that "may" allows for discretion is crucial for compliance and operational decisions.