MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
Service: To clean, to preserve, to charge, to
a. This section provides a general explanation of
agents, and air.
all maintenance and repair functions authorized at
Adjust: To rectify to the extent necessary to
various maintenance levels.
bring into proper operating range.
. Section II designates overall responsibility for
Aline: To adjust specified variable elements
the performance of maintenance functions on the
of an item to bring optimum performance.
identified end item or component. The implementation
Calibrate: To determine the corrections to be
of the maintenance functions upon the end item or
made in the readings of instruments or test
component will be consistent with the assigned
equipment used in precise measurement.
Consists of the comparisons of two
instruments, one of which is a certified
equipment required for each maintenance function as
standard of known accuracy, to detect and
adjust any discrepancy in the accuracy of the
instrument being compared with the certified
explanatory notes and/or illustrations required for a
particular maintenance function.
Install: To set up for use in an operational
environment such as an emplacement, site, or
a. Group Number, Column (1). The functional
Replace: To replace unserviceable items with
group is a numerical group set up on a functional basis.
serviceable assemblies, subassemblies, or
The applicable functional grouping indexes (obtained
from TB 750-93-1, Functional Grouping Codes) are
Repair: To restore an item to serviceable
listed on the MAC (Maintenance Allocation Chart) in the
condition. This includes, but is not limited to,
appropriate numerical sequence. These indexes are
inspection, cleaning, preserving, adjusting,
normally set up in accordance with their function and
proximity to each other.
b. Functional Group, Column (2). This column
Overhaul: To restore an item to a completely
contains a brief description of the components of each
serviceable condition as prescribed by
maintenance serviceability standards using
c. Maintenance Functions, Column (3).
the Inspect and Repair Only as Necessary
column lists the various maintenance functions (A
through K) and indicates the lowest maintenance
Rebuild: To restore an item to a standard as
category authorized to perform these functions. The
nearly as possible to original or new condition
symbol designations for the various maintenance
in appearance, performance, and life
categories are as follows:
expectancy. This is accomplished through
Operator or crew
complete disassembly of the item, inspection
of all parts or components, repair or
Direct support maintenance
replacement of worn or unserviceable
General support maintenance
elements (items) using original manufacturing
tolerances and specifications, and subsequent
The maintenance functions are defined as follows:
reassembly of the item.
Inspect: To determine serviceability of an
d. Tools and Equipment, Column (4). This column
item by comparing its physical, mechanical,
is provided for referencing by code the special tools and
and electrical characteristics with established
test equipment, (sec. III) required to perform the
Test: To verify serviceability and to detect
e. Remarks, Column (5). This column is provided
electrical or mechanical failure by use of test
for referencing by code the remarks (sec. IV) pertinent
to the maintenance functions.