Which situation requires immediate notification in aviation?

In aviation, safety is of utmost importance, and specific situations demand immediate attention and notification to prevent further complications. A failure of any internal turbine engine component that leads to debris escape is a critical incident that poses significant risks. Such a failure can jeopardize the safety of the aircraft, the crew, and the passengers, as it may lead to catastrophic engine failure or other system malfunctions.

The urgency in notifying appropriate authorities and personnel stems from the need for swift action to assess the situation, mitigate risks, and ensure that necessary corrective measures are taken. This can include grounding the aircraft, conducting thorough inspections, or implementing emergency procedures as needed.

In contrast, routine maintenance procedures, maintaining a flight crew's schedule, and normal passenger boarding procedures are part of standard operations in aviation, and while they are important, they do not typically require immediate notification as they do not present an immediate threat to safety.