MCTP 3-40E Maintenance Operations
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their assigned capabilities. Maintenance tasks performed within the field level of maintenance are
categorized as organizational and intermediate:
• Organizational. Organizational maintenance tasks are the responsibility of and performed by
the owning organization on its assigned equipment. It normally consists of inspecting, servicing,
lubricating, and adjusting, as well as the replacing of parts, minor assemblies, and subassemblies.
It is not only accomplished by maintenance personnel, but also by equipment operators.
• Intermediate. Intermediate maintenance tasks may require a higher level of technical training
and specialized tools and/or facilities. It consists of a range of capabilities including
modification, replacement, fabrication, overhaul, component/subcomponent/assembly/
subassembly repair, calibration and repair of test, measurement, and diagnostic
equipment (TMDE), software maintenance, precision machining, welding, evacuation,
disposal, salvage, and demilitarization of equipment or materiel.
Alignment of maintenance tasks within the field level of maintenance is established by
supporting/supported relationships that define the framework for alignment of organizational and
intermediate maintenance tasks. Supporting/supported relationships may be standing/long-term
and defined in unit mission statements and supported with capabilities established in tables of
organization and equipment (TO&Es) or assigned for specific operations and supported with task-
organized capabilities. Supporting/supported relationships will be planned and executed to align
and manage the respective maintenance capabilities among units as effectively as possible within
given constraints. Flexibility in alignment of maintenance tasks, within the supporting/supported
relationship framework, is required to enable commanders to best align maintenance requirements
to capabilities. Supporting commanders may perform maintenance tasks that are within supported
units’ capabilities, including but not limited to, overflow maintenance, contact teams, and
organizational tasks required to be performed for equipment to be evacuated to their supporting
unit. However, in making these decisions, commanders must consider the impacts of their
decisions not only to their own operations and resources, but also on those of their supporting/
supported units. Unit commanders should coordinate closely in order to ensure the most
effective use of maintenance resources (i.e., time, personnel, repair parts, tools and equipment,
facilities, funds, and publications) within their respective capabilities and incorporate local
standing operating procedures (SOPs) to facilitate the same.
Depot Level of Maintenance
The depot level of maintenance are actions taken on materiel or software involving the inspection,
repair, overhaul, modification, or reclamation (as necessary) of weapons systems, equipment end
items, parts, components, assemblies, and subassemblies that are beyond field-level maintenance
capabilities, and/or are authorized and directed by Deputy Commandant for Installation and
Logistics. Depot maintenance is not defined by location. The Marine Depot Maintenance Command,
other Service depots, commercial industrial facilities, original equipment manufacturers, or a
combination thereof may perform depot-level maintenance and related activities throughout the
logistic framework. In all cases, depot-level maintenance will be specifically authorized and
directed by Deputy Commandant for Installation and Logistics, following coordination with
Marine Corps Systems Command (MARCORSYSCOM)/Program Executive Office (PEO) and
MARCORLOGCOM. Under the total life cycle management process, the depot level of
maintenance is an essential part of supporting and extending equipment life cycles and can also be