MAINTENANCE ALLOCATION CHART
Section I. INTRODUCTION
function the item is to be used with. The letter is
representative of columns A through K on the MAC.
a. This section provides a general explanation of
E Aline: To adjust specified variable elements of an
all maintenance and repair functions authorized at
item to bring to optimum performance.
various maintenance levels.
F Calibrate: To determine the corrections to be made
II designates overall responsibility for
in the readings of instruments or test equipment
the performance of maintenance functions on the
used in precise measurement. Consists of the
identified end item or component. The implementation
comparisons of two instruments, one of which is a
of the maintenance functions upon the end item or
certified standard of known accuracy, to detect and
component will be consistent with the assigned
adjust any discrepancy in the accuracy of the
instrument being compared with the certified
c. Section III lists the special tools and test
equipment required for each maintenance function as
G. Install: To set up for use in an operational
environment such as an emplacement, site, or
IV contains supplemental instructions,
explanatory notes and/or illustrations required for a
H Replace: To replace unserviceable items with
particular maintenance function.
serviceable assemblies, subassemblies, or parts.
Repair: To restore an item 1 to serviceable
C-2. Explanation of Columns in Section 11
This includes but is not limited to, inspection,
a. Group Number, Column (1). The functional
cleaning, preserving, adjusting, replacing, welding,
group is a numerical group set up on a functional basis.
riveting, and strengthening.
The applicable functional grouping indexes (obtained
J Overhaul: To restore an item to a completely
from TB 750-931, Functional Grouping (;odes) are listed
serviceable condition as prescribed by maintenance
on the MAC in the appropriate numerical sequence.
serviceability standards using the Inspect and
These indexes are normally set up in accordance with
Repair Only as Necessary (IROAN) technique.
their function and proximity to each other.
K Rebuild: To restore all item to a standard as nearly
b. Functional Group, Column (2). This column
as possible to original or new condition in
contains a brief description of the components of each
appearance, performance, arid life expectancy.
This is accomplished through complete disassembly
c. Maintenance Functions, Column (3).
of the item, inspection of all parts or components,
column lists the various maintenance functions (A
repair or replacement of worn or unserviceable
through K) and indicates the lowest maintenance
elements (items) using original manufacturing
category authorized to perform these functions. The
tolerances and specifications, and subsequent
symbol designations for the various maintenance
reassembly of the item.
categories are as follows:
d. Tools and Equipment, Column (4). This column
C Operator or crew
is provided for referencing by code the special tools and
O Organizational maintenance
F Direct support maintenance
H General support maintenance
e. Remarks, Column (5). This column is provided
D Depot maintenance
The maintenance functions are defined as follows:
pertinent to the maintenance. functions.
A Inspect: To determine serviceability of an item by
comparing its physical, mechanical and electrical
characteristics with established standards.
B Test: To verify serviceability and to detect electrical
or mechanical failure by use of test equipment.
a. Reference Code. This column consists of a
number and a letter separated by a dash. The number
Service: To clean, to preserve, to charge, to paint,
references the T&TE requirements column on the MAC.
and to add fuel, lubricants, cooling agents, and air.
The letter represents the
Adjust: To rectify to the extent necessary to bring
into proper operating ranges specific maintenance