MIL-STD-1798C
Each safety- or mission-critical component entering the Depot shall have a Historical Record attached to the component or recorded against its serial number in a computer database. All maintenance actions shall be annotated on the form to assist in maintaining the reliability of the component. Components entering the Depot shall be overhauled and have the parts replaced, as required by the appropriate maintenance publication. If a part shortage occurs and a part that is listed for replacement during overhaul is not available, the cognizant engineering authority engineers may authorize the re-use of certain parts for one overhaul only. This shall be annotated on the Historical Record form. If the Field shops return a part to the Depot after
the forth overhaul, the Depot should perform a condition assessment to see if the part should be continued in-service or be disposed.
The Depot strongly influences the continued reliability of the components and systems. One-of- a-kind test equipment, special tools, and chemical plating are combined with special training to ensure components are returned to a "like-new" condition. The MECSIP Manager, in concert with Engineering, is responsible for ensuring component reliability.
5.5.3.2.5.1 Overhaul of systems.
As systems are initially received for overhaul (first scheduled Depot maintenance), one or more lead-the-fleet (high time) components shall be selected for a complete disassembly and inspection. The criteria for selection of these components shall be significant maintenance drivers (NMC or MMH drivers are typically used) that have shown a tendency to degrade due to age on other similar applications. The purpose is to compare the degradation against that predicted. If degradation is found in areas not expected, or the degradation is more severe than predicted, appropriate actions shall be taken to prevent in-service failure and/or unscheduled maintenance.
As systems age, wear in individual components may lead to unreliable and eventually failed systems. The tendency is to replace the component in the system that has the most wear and to return the air vehicle to service. This type of "piece-meal" repair lasts only until the next component fails. Once a unit or system reaches this condition, the refurbishment of the entire unit or system to "like-new" condition becomes more economical than the continued removal of an air vehicle from service to accomplish what are essentially temporary repairs. Analysis and, eventually, repair history must provide the basis to distinguish parts of the system to be overhauled from those that are not. While entire system replacement may seem expensive, the cost must be compared to the time lost for air vehicle downtime. Items such as torque tubes, rod end bearings, quadrants, pulleys, wiring harnesses, and related electrical equipment are prime candidates for this type of maintenance. These items require little attention from the MECSIP Manager in the beginning but must be part of the preventive maintenance actions as the air vehicle ages.
5.5.3.2.5.2 Monitoring of repairs/overhauls.
The MECSIP Manager shall ensure serviceable items returned to Base supply have been
"overhauled" or meet the intent of "overhaul." It is the MECSIP engineer's responsibility for
parts which are not allowed to fail in service and are not planned to "fly to failure", to ensure that any degradation in overall condition is acknowledged and accounted for in the overhaul
process. Acknowledging and accounting for partially degraded components requires an
Individual Aircraft Tracking (IAT), serialization, tracking of components, and monitoring of repairs.
59
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business