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

adjustments are left up to the operator so that they may tailor tasks to their specific operation and/or improve them. Mandated requirements may also be adjusted but only to make more rigorous (to keep original inspection/interval requirement intact).

5.5.3.11.3 MPD revisions.

The Program Office shall review/evaluate MPD revisions which are periodically released from OEM, tailor as needed, and incorporate changes into maintenance program as appropriate. Some MPD revisions may not be applicable to CDA because maintenance program tailored and/or inspection item not applicable due to modification or applicable system/component not installed. Tailoring of MPD revisions will be IAW AFI 21-101 where FAA mandated inspection requirements and inspection intervals are upheld and/or changes approved by FAA accordingly.

5.5.3.11.4 Use of FAA Certified Mechanics.

To maintain FAA certificate specifications for CDA, the SM ensures that only FAA-certified

repair stations or the original manufacturer perform contractual depot maintenance and use only FAA-certified commercial contractors for contract maintenance. DoD maintenance technicians and activities do not require FAA certification.

5.5.3.11.5 Service literature.

The SM receives, reviews/evaluates, and incorporates approved service actions accordingly, such as FAA Airworthiness Directives, original equipment manufacturer (OEM) service bulletins (SBs), and other service literature.

5.5.3.11.6 Service Difficulty Reports.

The SM shall participate in the FAA Service Difficulty Report program.

5.5.3.11.7 Usage monitoring.

The SM shall monitor usage of the weapon system ensure it is within the maintenance program usage parameters (e.g., 1000 FH per year) and flight constraints prescribed by pertinent aircraft flight manual. If usage thresholds exceeded or anticipated to be exceeded, the SM will adjust the maintenance program as necessary to maintain the FAA type certificate requirements. The SM shall consider use of calendar based time change for equipment on CDA with a FH based time change when the usage rate is much lower than the baseline commercial variant of the aircraft.

5.5.3.11.8 CDA Reliability Program.

The SM will establish and maintain a tailored reliability program. The FAA requires operators to develop a tailored reliability program or strategy to support the maintenance program. FAA recognizes maintenance program optimization is in the operator's best interest (economically and operationally) and as such, FAA does not mandate specific reliability program

requirements. Consequently, large fleet operators typically have an extensive reliability program in place where maintenance actions/discrepancies are documented, tracked, and analyzed in order to continuously optimize maintenance program/tasks throughout service life which improves customer satisfaction, fleet reliability, costs, etc. Tailored reliability program for small fleets (which includes most CDA) are typically not cost effective and/or may not provide statistically sufficient data; and so, an alternate program strategy is adopted such as more reliance on OEM or service literature for recommended changes based on fleet reports or other information gained from other operators.