Which term describes maintenance that allows removal and replacement of any part, zeroing the engine time?

• A. Limited Maintenance
• B. Line Maintenance
• C. Unlimited Maintenance
• D. Deferred Maintenance

Answer: (C)

Understanding maintenance scope is about how much work is permitted and how it affects engine life tracking. When maintenance is unlimited, technicians are authorized to remove and replace any part and to reset the engine’s time to zero after a complete overhaul or major repair. This broad authorization is what allows a full teardown and reassembly, effectively starting the engine’s time count fresh because the life limits on components are tied to time on wing or cycles. In contrast, limited maintenance restricts what can be done within a given task set, and line maintenance covers routine, on-the-spot work that rarely involves a full teardown or time reset. Deferred maintenance means delaying tasks until later. So the term that best describes removal and replacement of any part with zeroing the engine time is unlimited maintenance.