What event requires a mandatory report of a missed approach?

A mandatory report of a missed approach occurs when a pilot is unable to land as planned and must abandon the landing procedure, often due to factors such as poor visibility, obstacles, or an unstable approach. This situation is critical as it informs air traffic control (ATC) of the aircraft's status and intentions, allowing them to manage traffic effectively and ensure safety for both the aircraft involved and others in the vicinity.

The requirement for reporting a missed approach serves several purposes: it keeps ATC informed about the aircraft's position and intentions, allows for the re-sequencing of arriving aircraft, and ensures that any potential issues are addressed promptly. This communication is essential for maintaining safe and efficient operations within busy airspace.

Other options, while they might involve changes in flight operations or conditions, do not specifically trigger the mandatory reporting requirement associated with a missed approach.