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

To "overhaul" a component is to return it to a "like-new" condition. To "repair" a component is simply to make it serviceable. Unfortunately, it is difficult or impossible to restore a used part to a "like-new" condition. Parts which were not replaced during overhaul have some percentage of their original life consumed. Plating landing gear to build-up areas where corrosion was removed can affect the overall properties of the unit.

5.5.3.2.5.3 Depot-level check on organizational- and intermediate-level full and partial overhauls.

If a component is partially overhauled at the organizational or intermediate level, the component shall be returned to the Depot before the fourth overhaul to ensure the reliability continues to be met.

The MECSIP Manager shall either ensure each Field or Base has the proper "overhaul" capabilities (i.e., test equipment, TOs, plating equipment, etc.) for a specific component, or prohibit performance of the overhaul at that location. This can be best accomplished by ensuring the Aircraft Scheduled Inspection and Maintenance Requirements are current and enforced. If a component is repaired at the Field/Base level, then consideration shall be given to a requirement that the component be periodically returned to the Depot (e.g., after the third Field/Base-level overhaul) to ensure the reliability of the component continues to be met. The

MECSIP Manager can recommend no Field/Base-level repairs. The MECSIP Manager can also recommend establishment of regional repair facilities. The cost of training technicians and test

equipment may prohibit Field/Base-level repairs and may lead to regional or "Queen Bee"

facilities. The MECSIP Manager shall maintain a list of contacts for each Field/Base and be aware of their capabilities. If an overhaul is performed, the master maintenance action log originated by the owner Depot must be updated.

5.5.3.2.5.4 Component test bench calibrations.

Subsystem component test benches shall be routinely calibrated to ensure consistent performance measurement. The subsystems test bench calibration methodology and limits shall be approved by the principle integration engineering authority.

5.5.3.3 Monitor mishaps, HAZREPS and deficiency reports for applicability to MECSIP

components.

The Program Office shall monitor mishaps, HAZREPS and deficiency reports for applicability to MECSIP components. If these reports apply to MECSIP components, the Program Office shall consider if the new information reveals the component classification to be more critical than previously understood. Where the classification moves to safety- or mission-critical, the Program Office shall take appropriate action, including those actions necessary to insure flight- critical component in-service failure rates do not exceed 1x10-7 per flight hour.

5.5.3.4 Monitor data integrity.

The Program Office shall monitor maintenance data integrity and emphasize its importance to making informed decisions to optimize aircraft safety and availability. Training classes shall be initiated by the working group to ensure each technician is aware the information entered will be used by Engineering to initiate preventive maintenance actions for unreliable components. Additionally, during each PIWG hosted by the Program, the RAT shall brief the importance of accurate data and identify preventive actions initiated by previously-submitted data.