MIL-STD-1798 Mechanical Equipment And Subsystems Integrity ProgramThe purpose of this standard is to describe the general process to achieve and maintain the physical and functional integrity of the mechanical elements of aircraft systems. The goal of this integrity program is to achieve the desired level of safety and aircraft availability at the most economic cost across the life cycle of the weapon system. This standard allows the process to be tailored in a competitive environment to meet specific equipment, subsystem, and/or system requirements. The Mechanical Equipment and Subsystems Integrity Program MECSIP is implemented in the planning process and continued until retirement of the system.

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MIL-STD-1798C

3.46  Redundancy management.

The process of managing redundant elements in order to identify a failure and then

reconfiguring the system to remove the effects of the failed element and continue operation with unfailed elements.

3.47  Reliability Centered Maintenance.

Reliability Centered Maintenance (RCM) is an analytical process to determine the appropriate failure management strategies, including PM requirements and other actions that are warranted to ensure safe operations and cost-wise readiness. This process of developing PM requirements, with an auditable documentation package, is based on the reliability of the

various components, the severity of the consequences related to safety and mission if failure occurs, and the cost effectiveness of the task.

3.48  Remote rate of failure.

A remote rate of failure is defined in AWB-013 and NAVAIRINST 5000.21B.  Remote rate is the second lowest probability defined in AWB-013 and NAVAIRINST 5000.21B.

3.49  Restoration.

An act of restoration, ranging from cleaning or replacement to complete overhauls:  restoration

is that work necessary to return the item to a specific standard.  Since restoration may vary from cleaning or repairing to complete overhauls, the scope of each assigned restoration task has to be specified.

3.50  Reversionary control modes.

Reversionary control modes is a fail-safe design approach that employs control system modes that accommodate failures by reverting to known safe states and/or utilizing control limitations (i.e., degraded control modes) to preserve safe operation.

3.51  Safe-life.

Safe-life is a duration measure (i.e., hours, load cycles) where a low probability exists that the component will fail or degrade below safe design levels.  Safe-life components are normally replaced when the design safe-life occurs.

3.52  Safety-critical.

A term applied to any condition, event, operation, process or item whose proper recognition, control, performance or tolerance is essential to safe system operation.

3.53  Safety-critical software.

Safety-critical software provides safety-critical functionality and is designated with a mechanization assurance level classification of "safety critical" so that risk mitigating processes are used in the development and verification of the software.

3.54  Serially managed part.

A serially managed part is a part whose usage is tracked for all applicable factors significant to prevent in-service failure of that part.  These factors include:

a.   Aircraft tail number upon which the part is installed b.   Flight Hours accumulated

c.   Calendar time accumulated since installation

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