What constitutes a "Deviation from Procedures"?

A "Deviation from Procedures" refers specifically to instances where established policies or guidelines are not followed. This can occur when protocols are ignored or not enacted correctly, potentially leading to safety risks or operational inefficiencies. The emphasis on failure indicates a departure from standard operating procedures, which is critical in aviation where adherence to guidelines is paramount for maintaining safety and compliance.

The other choices highlight actions or concepts that align with proper procedures rather than deviating from them. Following established policies correctly and adhering to safety regulations both reflect compliance and procedure fidelity, while communicating changes with Air Traffic Control (ATC) is an essential part of operational protocol but does not encapsulate the concept of deviation. Understanding this distinction is key to ensuring safe flight operations and effective response to procedural instructions.