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A P P E N D I X B
MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
B-1. General
a. Section I provides a general explanation of all
maintenance and repair functions authorized at
various maintenance levels.
b. Section II designates overall responsibility for
the performance of maintenance operations on the
identified end item or component. The im-
plementation of the maintenance tasks upon the
end item or component will be consistent with the
assigned maintenance operations.
c. Section III lists the special tools and test
equipment required for each maintenance
operation as referenced from Section II.
d. Section IV contains supplemental instructions,
explanatory notes and / or illustrations required for
a particular maintenance function.
B-2. Explanation of Columns in Section II
a. Functional Group Number. The functional
group is numerical group set up on a functional
basis. The applicable functional grouping indexes
(obtained from TB 750-93-1 Functional Grouping
Codes) are listed on the MAC (Maintenance
Allocation Chart) in the appropriate numerical
sequence. These indexes are normally set up in
accordance with their function and proximity to
each other.
b. Component Assembly Nomenclature. This
column contains a brief description of the com-
ponents of each functional group.
c. Maintenance Operations and Maintenance
Levels. This column lists the various maintenance
operations (“A through “K”) and indicates the
lowest maintenance level authorized to perform
these operations. The symbol designations for the
various maintenance levels are as follows:
C. . . . . Operator and/or crew
O . . . . Organizational maintenace
F. . . . . Direct support maintenance (DS)
H. . . . General support maintenance (GS)
D. . . . Depot maintenance
The Maintenance Operations are defined as
follows:
C—SERVICE: Operations requiring periodically to keep
the item in proper operating condition, i.e., to clean,
preserve, drain, paint, and replenish fuel, refrigerant
lubricants, hydraulic, and deicing fluids, or compressed
air supplies.
D—ADJUST: Regulate periodically to prevent malfunc-
tion. Adjustments will be made commensurate with
adjustment procedures and associated equipment
specifications.
E-ALINE: Adjust two or more components of an elec-
trical or mechanical system so that functions are
properly synchronized or adjusted.
F—CALIBR ATE: Determine, check, or rectify the
graduation of an instrument, weapon, or weapons
system or components of a weapons system.
A—INSPECT: Verify serviceability and detect incipient
electrical or mechanical failure by close visual
examination.
B—TEST: Verify serviceability and detect incipient
electrical or mechanical failure by measuring the
mechanical or electrical characteristics of the item and
comparing those characteristics with authorized
standards. Detect leaks in the refrigerant system with
the aid of a leak detector. Tests will be made com-
mensurate with test procedures and with calibrated
tools and /or test equipment reference in the MAC
H—REPLACE: Substitute serviceable components,
assemblies and subassemblies for unserviceable counter
parts or remove and install the same item when
required for the performance of other maintenance
operations.
G—INSTALL: To set up for use in an operational en-
vironment such as an emplacement, site, or vehicle.
I—REPAIR : Restore to a serviceable condition by
replacing unserviceable parts or by any other action
required using available tools, equipment and skills—to
include welding, grinding, riveting, straightening,
adjusting and facing.
J—OVERHAUL: Restore an item to a completely serv-
iceable condition (as prescribed by serviceability
standards developed and published by the commodity
commands) by employing techniques of “Inspect and
Repair Only as Necessary” (IROAN). Maximum use of
diagnostic and test equipment is combined with
minimum disassembly during overhaul. “Overhaul”
may be assigned to any level of maintenance except
organizational, provided the time, tools, equipment,
repair parts authorization, and technical skills are
available at that level. Normally, overhaul as applied to
end items, is limited to depot maintenance level.
K—REBUILD: Restore to a condition comparable to new
by disassembling to determine the condition of each
component part and reassembling using serviceable,
rebuilt, or new assemblies, subassemblies, and parts.
d. Tools and Equipment. This column is
provided for referencing the Special Tool and Test
Equipment Requirements (sec. III) and Remarks
(sec. IV) that may be associated with maintenance
operation (sec. II).
B-1
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