What document must be filed by the pilot when a VFR flight plan has been filed?

When a pilot files a VFR (Visual Flight Rules) flight plan, it is essential to notify Air Traffic Services (ATS) upon arrival to ensure that they are aware of the flight's completion. This is done through an arrival report. The arrival report confirms that the flight has landed safely and that the aircraft is no longer active in flight. This communication helps ATS manage air traffic more effectively, ensuring that resources are appropriately allocated and that searches are not erroneously initiated for aircraft that have safely reached their destination.

The other options relate to different scenarios and requirements that do not specifically pertain to the procedure required after filing a VFR flight plan. For example, an initiation report is unnecessary once a flight plan is filed, while a flight completion report and an incident report are needed under different circumstances, such as after a significant incident or mishap. Therefore, the requirement to submit an arrival report upon landing reinforces the importance of clear communication in aviation operations.