Final answer:
A new Flight Release is required when there are significant changes to the flight plan, aircraft substitution, changes in operational control, or identification of new maintenance issues. It ensures the aircraft is safe and complies with aviation standards before departure.
Step-by-step explanation:
Items that require a new Flight Release typically refer to operational aspects affecting commercial aviation. These can include significant changes to the flight plan, aircraft substitution, changes in operational control, or if new maintenance issues are identified that affect airworthiness. A flight cannot legally depart without a valid Flight Release, which confirms that all necessary checks, maintenance, and regulations have been met and the aircraft is considered safe for the intended flight.
In practice, whenever there is a significant change that could potentially impact the safety of the flight, a new Flight Release would be required. This ensures adherence to safety protocols and compliance with aviation regulations. For example, if there was a mechanical issue fixed since the last release, a change in crew, or severe changes in weather that would affect the original flight path, a new release would be necessary before take-off.