M A I N T E N A N C E ALLOCATION CHART
Section I. INTRODUCTION
B-1. General
B--Test: To verify serviceability and to detect electrical or
mechanical failure by use of test equipment.
a. This section provides a general explanation of
C--Service: To clean, to preserve, to charge, to paint. and to
all maintenance and repair functions authorized at
add fuel, lubricants, cooling agents, and air.
various maintenance levels.
D--Adjust: To rectify to the extent necessary to bring into
b. Section II designates overall responsibility for
proper operating range.
E--Aline: To adjust specified variable elements of an item
the performance of maintenance functions on the
to bring to optimum performance.
indentified end item or component. The im-
F--Calibrate: To determine the corrections to be made in
plementation of the maintenance functions upon
the readings of instruments or test equipment used in
the end item or component will be consistent with
precise measurement. Consists of the comparisons of
the assigned maintenance functions.
two instruments, one of which is a certified standard of
known accuracy, to detect and adjust any discrepancy
c. Section III not applicable.
in the accuracy of the instrument being compared with
d. Section IV not applicable.
the certified standard.
B-2. Explanation of Columns in Section II
G--Install: To set up for use in an operational environment
such as an emplacement, site, or vehicle.
a. Group Number, Column (1). The assembly
H--Replace: To replace unserviceable items with ser-
group is a numerical group assigned to each
viceable assemblies, subassemblies, or parts.
assembly in a top-down breakdown sequence. The
I-- Repair: To restore an item to serviceable condition.
This includes, but is not limited to, inspection, cleaning,
applicable assembly groups are listed on the MAC
preserving, adjusting, replacing, welding, riveting, and
(Maintenance Allocation Chart) in disassembly
strengthening.
sequence beginning with the first assembly
J--Overhaul: To restore an item to a completely ser-
removed in a top-down disassembly sequence.
viceable condition as prescribed by maintenance ser-
b. Assembly Group, Column (2). This column
viceability standards using the Inspect and Repair Only
contains a brief description of the components of
as Necessary (IROAN) technique.
K--Rebuild: To restore an item to a standard as nearly as
each assembly group.
possible to original or new condition in appearance,
c. Maintenance Functions. Column (3). This
performance, and life expectancy. This is accomplished
column lists the various maintenance functions (A
through complete disassembly of the item, inspection of
through K) and indicates the lowest maintenance
all parts or components, repair or replacement of worn
category authorized to perform these functions.
or unserviceable elements (items), using original man-
ufacturing tolerances and specifications, and sub-
The symbol designations for the various main-
sequent reassembly of the item.
tenance categories are as follows:
d. Tools and Equipment, Column (4). T h i s
C--Operator or crew
column is provided for referencing by code the
O--Organizational
maintenance
special tools and test equipment (sec. III) required
F--Direct support maintenance
to perform the maintenance functions (sec II).
H--General
support
maintenance
e. Remarks, Column (5). This column is
The maintenance functions are defined as follows:
provided for referencing by code the remarks (sec.
IV) pertinent to the maintenance functions.
A--Inspect: To determine serviceability of an item by
comparing
its physical, mechanical, and electrical
characteristics with established standards.
