Which type of maintenance includes rework and upkeep?

Unscheduled maintenance is characterized by the need for immediate repair or upkeep that arises unexpectedly, usually due to a malfunction or failure of a component. This type of maintenance can encompass rework, where an item is repaired or modified to meet specifications, and ongoing upkeep to ensure that the equipment continues to operate effectively.

In aviation, unscheduled maintenance is crucial for addressing unforeseen issues that can affect safety or performance. It emphasizes the importance of being prepared to react promptly to any operational concerns, thus ensuring that aircraft remain in optimal flying condition.

Scheduled maintenance, while essential for routine checks and preventive upkeep, does not typically include the reactive nature of rework associated with unscheduled maintenance. Similarly, phase inspections and special inspections refer to specific types of evaluations and checks performed at designated times or under particular conditions rather than addressing unplanned repairs.