MIL-STD-1798C
5.5.3.8 Manage Durability-critical components.
Durability-critical items are classified in two groups, legacy and interfacing subsystems. If a service life extension is granted for the aircraft, legacy items shall be evaluated and deemed serviceable or a replacement program initiated. Interfacing subsystem components shall be replaced as a whole system or "system refurbishment" when replacement of one or more sections is required. Examples of Legacy and Interfacing subsystems follows:
a. Legacy items such as wiring, circuit breakers, rack mounts, depleted uranium, and indicators are generally designed for the original life of the aircraft and do not require any special maintenance.
b. Interfacing subsystems are items that are linked and associated such that changing one would cause the other to wear or weaken at a higher rate. Items like torque tubes, quadrants, rod end bearings, and hot air ducts are a few examples of interfacing subsystems.
5.5.3.9 Manage Durability-noncritical/expendable components.
The failure of these items shall be handled during routine maintenance and will not impact mission, safety, or operational readiness.
5.5.3.10 Develop new MECSIP Parts.
Modifications to address evolving mission requirements, to correct safety deficiencies and/or to improve the overall reliability/maintainability of weapon system are common activities during the sustainment phase.
5.5.3.10.1 Follow MECSIP development tasks (Tasks I, II, III and IV).
Each modification is essentially a "mini" Engineering and Manufacturing Development (EMD) effort. The engineering organization that manages the modification shall follow all applicable sections of this MIL-STD Tasks I through IV in the development of the modification. Of particular importance is proper criticality classification of the components involved in the modification (reference 5.2.9).
5.5.3.10.2 Update FMECAs and HAs.
These documents shall be updated to address the effect of configuration changes on the failure modes and hazards, not only of the components changed but also of the components which interface with those modified components.
5.5.3.10.3 Replacement of obsolete equipment.
The Program Office shall evaluate if obsolete equipment should be replaced with newer technology or new versions of the existing technology. This analysis shall use comparative system data and the Cost of Unreliability Model (reference 5.5.1.12). Some older aircraft use antiquated equipment where replacement with newer technology may provide improved reliability and mission capable rates. An example of this would be the new fly-by-wire versus
the mechanical linkage for flight controls. It may be cheaper and more feasible to replace these systems with the newer technology.
5.5.3.10.4 Environmental regulations.
Environmental regulations shall be considered in the selection of materials. Changes in the environmental laws may also drive replacement programs. Any replacement material shall be analyzed and/or tested to ensure it meets the original design and service life requirements. For
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