What does a "C" signify on a work manual?

The designation "C" in a work manual stands for "Confidential." In the context of aviation and other military-related operations, documents and manuals are often classified based on their sensitivity and the potential impact of their disclosure on operational security. A "Confidential" classification suggests that the information contained within the manual is restricted to prevent unauthorized access, as its disclosure could have adverse effects on national security or operational effectiveness.

Understanding this classification helps those working in sensitive environments recognize the importance of handling such materials responsibly. It emphasizes the need for personnel to be aware of the protocols surrounding access to sensitive information, ensuring that they adhere to security policies and protect critical capabilities. The use of the term "Confidential" is a standard practice in many organizations to safeguard sensitive information while still allowing a level of access to personnel who need that information to perform their tasks effectively.