Logistics can be seen as the compound of all the considerations needed to ensure the efficient and economical support of a system throughout its life cycle. The unscheduled actions, performed as a result of a failure or a perceived failure, that are necessary to restore a system to its required level of performance is corrective maintenance. Such activities may include troubleshooting, disassembly to gain access to the faulty item, repair, remove and replace, reassembly, alignment and adjustment and checkout. The frequency of maintenance for a given item is highly dependent on the reliability of that item. In general, as the reliability of a system increases, the frequency of maintenance will decrease and, conversely, the frequency of maintenance will increase as system reliability is degraded.

Performance in the en route phase can be measured using the range and endurance parameters of the airplane. The range is a more useful performance parameter than endurance and one that aircraft designers are constantly trying to improve. While endurance refers to airborne time, the range is more concerned with distance covered and is therefore sometimes referred to as fuel mileage. In most cases, the trade-off between range and payload is achieved at the initial purchase of the aircraft and, subsequently during in-flight planning.

Each time an aircraft system fails, a series of steps are required to repair or restore the aircraft to full operational status. The steps include failure detection, fault isolation, disassembly to gain access to the defective element, repair, and so on. The frequency of the maintenance becomes a significant parameter in determining system support requirements. The maintenance frequency for a particular item depends very much on the reliability of that item. In order to exemplify this idea the present paper contains a series of analyzes whose purpose is to identify the critical parts for a medium courier turboprop aircraft operated by the Romanian Air Force.

This paper introduces the connection between old aircraft and flight safety as well as the present state and potential futures for managing old aircraft. Age can be managed in two ways: retiring the aircraft and buying a newer one, or properly sustaining aging aircraft through additional and targeted maintenance. To do this, manufacturers, maintainers, operators, and owners must work together with regulators. A good way to guarantee proper maintenance is through continuing airworthiness programs and supplemental inspection programs. While the effects of aging on an aircraft can be detrimental to safety, they can be reduced with proper maintenance. If the operators follow the maintenance programs, current and future maintenance programs will operate as a preventative strategy to lessen the safety risk associated with aging aircraft.