What type of maintenance is performed every 100 flight hours?

The type of maintenance performed every 100 flight hours is referred to as Phase Maintenance Check. This maintenance schedule is established to ensure that aircraft remain in safe operational condition and to perform systematic checks on various systems and components.

Phase Maintenance Checks are designed to occur at defined intervals, such as every 100 flight hours, to address wear and tear on the aircraft and to allow for inspections that may not be feasible during more routine checks. This type of maintenance allows for a thorough examination of key aircraft systems and components, ensuring they are functioning properly and identifying any potential issues before they affect flight safety.

The other options represent different types of maintenance that do not align with the 100 flight hour interval. An Annual Inspection is typically more comprehensive and occurs on a yearly basis, focusing on long-term maintenance needs. A Daily Inspection is a shorter, more routine check conducted daily before flight to ensure that the aircraft is ready for operation. Scheduled Lubrication, while important, is often performed on a more frequent basis or as specified in the aircraft's maintenance manual, rather than being tied to a specific flight hour milestone like the Phase Maintenance Check.