What is a possible consequence of an unscheduled maintenance entry in the Journey log?

An unscheduled maintenance entry in the Journey log indicates that the aircraft underwent unscheduled maintenance, often due to an unexpected issue discovered during operation. This entry typically points to a discrepancy or a problem that needs to be addressed to ensure the aircraft's safe operation.

When there is an unscheduled maintenance entry, it often implies that the aircraft may not meet the necessary airworthiness standards until the identified issues are resolved. This could lead to the aircraft being deemed not airworthy if the problem affects its safe operation. Thus, recognizing such entries is crucial for maintaining the safety of flight operations.

The other options do not accurately reflect what occurs following an unscheduled maintenance entry. For example, an aircraft cannot be operated safely if it has unresolved maintenance issues related to airworthiness. Additionally, weight exemptions or ignoring logged maintenance are not applicable in this context since the priority is always the safety and airworthiness of the aircraft.