area, at a particular base or station, or aboard aviation
ships. The mission of I-level maintenance activities is
to sustain the combat readiness of supported activities
(squadrons) by providing quality and timely material
support at the nearest location with the lowest practical
resource expenditure. I-level maintenance includes:
Shop-type repair and test work on aircraft, com-
ponents, and equipment from supported units
Technical assistance to supported units
Manufacture of selected aeronautical compo-
nents, liquids, and gases
Performance of on-aircraft maintenance when
Permanently assigned Sailors and Sailors that are
temporarily assigned from tenant squadrons man inter-
mediate maintenance activities. When these squadrons
deploy, their intermediate maintenance Sailors
accompany the squadron and are temporarily assigned
to the aircraft intermediate maintenance department
(AIMD) onboard the ship or at the new station.
Depot Maintenance (D-Level)
Depot-level maintenance supports O- and I-levels
of maintenance by providing engineering assistance
and performing maintenance that is beyond the capabi-
lity of O- and I-level activities. Depot maintenance is
work that must be done in an industrial-type facility.
Such a facility may either be civilian, military, or both.
If the work is contracted out to a civilian facility, the
type of work is still depot maintenance. Standard
depot-level maintenance (SDLM) includes overhaul,
repair, and modification of aircraft, components, and
equipment. Depot maintenance also includes the manu-
facture of aeronautical parts for spares, the manufacture
of kits for aircraft, and the modification of equipment.
The depot level or a lower level of maintenance installs
the spare parts and incorporates modification kits.
For the most part; civilians man naval aviation
depots (NADEPs), which are Navy depot-level
maintenance facilities. Military personnel at a NADEP
help perform the intermediate and organizational
maintenance work that is related to the depot facility.
Maintenance technicians perform two types of
aircraft maintenance within the Navyrework and
Rework may be performed on any aircraft or
equipment. Industrial-type facilities that provide
maintenance program support perform rework. Rework
is the restorative and additive work that NADEPs,
contractor facilities, or other industrial-type facilities
perform on aircraft or equipment. There are two
categories of reworkSDLM and special.
Upkeep is the preventive, restorative, or additive
maintenance for aircraft and equipment. Activities
(squadrons) that have aircraft or equipment or have the
responsibility of providing direct support to activities
that have aircraft or equipment perform upkeep.
Upkeep includes periodic inspections, servicing,
preservation, modification, replacement, and repair.
There are also two categories of upkeepSDLM and
Navy shore activities that have intermediate
maintenance responsibilities have an AIMD to perform
the maintenance. Those shore activities with aircraft
have an OMD within the operations department to
perform organizational maintenance on assigned
aircraft and transient aircraft.
A naval air reserve unit performs organizational
and intermediate maintenance on its aircraft; however,
the supporting station provides logistic support. A
naval air reserve squadron that is on active duty or is
assigned to a fleet unit provides organizational
maintenance on its aircraft.
Multipurpose aircraft carriers and amphibious
assault ships perform organizational and intermediate
maintenance on assigned aircraft. These ships also
provide organizational and intermediate material,
facilities, and support equipment to embarked air
wings, squadrons, and other units.
A squadron performs organizational maintenance
on its aircraft. While shore based, designated squadron
maintenance technicians are assigned to the AIMD of
the supporting station for training and augmentation of
the support effort. When the squadron is afloat,
designated squadron maintenance personnel are
assigned, as required, to the AIMD of the supporting