MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
in the accuracy of the instrument being compared with
a. This section provides a general explanation of all
G-Install: To set up for use in an operational
maintenance and repair functions authorized at various
environment such as an emplacement, site or vehicle.
H-Replace: To replace unserviceable items with
serviceable like items.
performance of maintenance functions on the identified
I-Repair: Those maintenance operations necessary to
end item or component. The implementation of the
restore an item to serviceable condition through
maintenance functions upon the end item or component
correction of material damage or a specific failure.
will be consistent with the assigned maintenance
Repair may be accomplished at each category of
c. Section III-Not applicable.
Normally, the highest degree of
maintenance performed by the Army in order to
and explanatory notes required for a particular
minimize time work in process is consistent with
quality and economy of operation It consists of that
B-2. Explanation of Columns in Section II
maintenance necessary to restore an item to
a. Group Number, Column (1). The assembly group
completely serviceable condition as prescribed by
is a numerical group assigned to each assembly in a top
maintenance standards in technical publications for
down breakdown sequence. The applicable assembly
each item of equipment. Overhaul normally does not
groups are listed on the MAC (Maintenance Allocation
return an item to like new, zero mileage, or zero hour
Chart) is disassembly sequence beginning with the first
assembly removed in a top down disassembly
The highest degree of material
maintenance. It consists of restoring equipment as
b. Functional Group, Column (2). This column
nearly as possible to new condition in accordance
contains a brief description of the component of each
with original manufacturing standards. Rebuild is
performed only when required by operational
c. Maintenance Functions, Column (3). This
considerations or other paramount factors and then
column lists the various maintenance functions (A
only at the depot maintenance category. Rebuild
through K) and indicates the lowest maintenance
reduces to zero hours or miles the equipment, or
category authorized to perform these functions. The
component thereof, has been in use
for the various maintenance
The uppercase letter placed in the
categories are as follows:
appropriate column indicates the lowest level at which
C-Operator or crew
that particular maintenance function is to be
F-Direct support maintenance
d. Tools and Equipment, Column (4). This column is
H-General support maintenance
provided for referencing by code the special tools and
test equipment (sec. III) required to perform the
The maintenance functions are defined as follows:
maintenance function (sec. II).
A-Inspect: To determine serviceability of an item by
e. Remarks, Columns (5). This column is provided
comparing its physical, mechanical, and electrical
for referencing by code the remarks (sec. IV I pertinent
characteristics with established standards.
to the maintenance functions.
B-Test To verify serviceability and to detect electrical or
B-3 Explanations of Columns in Section III- Not
mechanical failure by use of test equipment.
C-Service. To clean, to preserve, to charge, and to add
B-4. Explanations of Columns in Section IV
fuel, lubricants, cooling agents, and air.
a. Reference Code. This column consists of two
D-Adjust- To rectify to the extent necessary to bring into
letters separated by a dash, both of which are
proper operating range.
references to section II. The first letter references
E-Align: To adjust specified variable elements of an item
column 5 and the second letter references a
to bring to optimum performance.
maintenance function, column 3, A through K.
F- Calibrate: To determine the corrections to be made in
b. Remarks. This column lists information pertinent
the readings of instruments or test equipment used in
to the maintenance function being performed, as
precise measurements. Consists of the comparison of
indicated on the MAC, section II.
two instruments, one of which is a certified standard of
known accuracy, to detect and adjust any discrepancy