MIL-STD-1798C
5.5.1.7 Review Time Change Items (TCIs).
All TCIs shall be reviewed to ensure they meet time change criteria and that the correct replacement schedule is being administered. The primary objective of a TCI program is to achieve maximum utilization of components, consistent with the economic operation of the weapon systems, without jeopardizing flight or operational safety. Time change replacement requirements are prescribed only for those items that have a measured service life expectancy and that display an age-related failure pattern. Additionally, the item must fall into one or more of the following categories to be a valid candidate for time change:
a. items whose failure due to location or function within a system would compromise safety of flight
b. items whose failure would cause a mission to abort or cause excessive aircraft downtime c. items for which a failure might cause damage beyond economical repair
d. items that have a predictable in-use service life.
5.5.1.8 Verify Technical Data for both on- and off-equipment repair/overhaul is available and current.
The Program Office shall verify that each safety-, mission- and reliability-critical components have both a Job Guide procedure (for on-equipment maintenance) and a commodity publication (for off-equipment maintenance) for repair and overhaul procedures. If unavailable, the OEM and/or Equipment Specialist (ES) shall establish the appropriate technical data on a priority basis. Engineering and associated ESs have the responsibility for the technical content contained in these manuals and Job Guides. Additionally, the MECSIP Manager and Source of Repair (SOR) must ensure each Base that requests in-shop overhaul capability has the proper "overhaul" test equipment, facilities, and training, or restrict that Base from performing the overhaul.
5.5.1.9 Determine maintenance data requirements.
The program shall identify maintenance data system/requirements appropriate for metrics to facilitate management of MECSIP equipment in the sustainment phase. Example: The G081
Maintenance Data Collection (MDC) is the system the Air Mobility Command (AMC) has chosen to use for the C-5. G081 has the capability to track components, by WUC and serial number. If
required, it provides for historical documentation for selected components using an AFTO Form 95. Additionally, an aircraft's NMC status and systems reliability data (i.e., maintenance
man-hours, failure analysis, enroute failures, air abort data, and ISO and HSC documentation)
can be extracted.
5.5.1.10 Establish Product Quality Deficiency Reporting (PQDR) procedures.
The program shall establish PQDR procedures (USAF see Technical Order 00-35D-54) and shall evaluate the all PQDR reports to identify trends and understand root cause of failure. Overhauled components should remain serviceable for a predetermined amount of time and/or flying hours. When a component fails to meet any of the PQDR requirements, a deficiency occurs. Maintenance should document defective parts with a PQDR when the criteria identified in 5.5.2.14 is encountered.
5.5.1.11 Equipment manufacturing and integration.
This requirement only applies to safety-critical components. The Program Office shall review the engineering and manufacturing plans to verify they are adequate to consistently produce components with the required attributes to insure safety in operation. All changes to the
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