When can ATC request a detailed emergency report even if no rules have been violated?

Air Traffic Control (ATC) can request a detailed emergency report when priority has been granted, regardless of whether any rules have been violated. In situations where an aircraft has declared an emergency or when ATC has provided priority handling, they may seek further information to understand the circumstances surrounding the situation. This request helps ATC maintain situational awareness, allocate resources effectively, and ensure safety.

When priority is granted, it indicates that the situation requires immediate attention, which can justify ATC's need for a report despite no regulations being broken. This process is critical for evaluating responses and making any necessary operational changes to prevent future incidents.

In contrast, reporting during flight or after landing does not automatically trigger an ATC request for a detailed report, as these actions may not be directly tied to the need for immediate operational awareness. Furthermore, leaving the discretion solely to pilots does not align with the authority and intent of ATC to maintain overall airspace safety and coordination during an emergency scenario.