Appendix B. MAINTENANCE ALLOCATION CHART

TM 10-3930-627-12

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

F-Calibrate: To determine the corrections to be

B-1. General

a. This section provides a general explanation

made in the readings of instruments or test

of all maintenance and repair functions authorized at

equipment used in precise measurement.

various maintenance levels.

Consists of the comparison of two instruments,

b. Section II designates overall responsibility for

one of which is a certified standard of known

accuracy, to detect and adjust any discrepancy

the performance of maintenance functions on the

identified end item or component. The implementation of

in the accuracy of the instrument being

compared with the certified standard.

the maintenance functions upon the end item or

G-Install: To set up for use in an operational

component will be consistent with the assigned

maintenance functions.

environment such as an emplacement, site, or

B-2. Explanation of Columns in Section II

vehicle. H-Replace: To replace unserviceable

a. Group Number, Column (1). The assembly

items with serviceable like items.

group is a numerical group assigned to each assembly in

I-Repair:

Those

maintenance

operations

a top down breakdown sequence.

The applicable

necessary to restore an item to serviceable

assembly groups are listed on the MAC in disassembly

condition through correction of material

sequence beginning with the first assembly removed in a

damage or a specific failure. Repair may be

top down disassembly sequence.

accomplished

each

category

b. Assembly Group, Column (2). This column

maintenance.

contains a brief description of the components of each

J-Overhaul: Normally, the highest degree of

assembly group.

maintenance performed by the Army in order

c. Maintenance Functions, Column (3). This

to minimize time work in process is consistent

column lists the various maintenance functions (A

with quality and economy of operation. It

through K) and indicates the lowest maintenance

consists of that maintenance necessary to

category authorized to perform these functions. The

restore an item to completely serviceable

symbol designations for the various maintenance

condition as prescribed by maintenance

categories are as follows:

standards in technical publications for each

C-Operator or crew

item of equipment. Overhaul normally does not

O-Organizational maintenance

return an item to like new, zero mileage, or

F-Direct support maintenance

zero hour condition.

H-General support maintenance

K-Rebuild: The highest degree of material

D-Depot maintenance

maintenance.

It consists of restoring

The maintenance functions are defined as follows:

equipment as nearly as possible to new

A-Inspect: To determine serviceability of an item

condition in accordance with original

by comparing its physical, mechanical, and

manufacturing standards.

Rebuild is

electrical characteristics with established

performed only when required by operational

standards.

considerations or other paramount factors and

B-Test: To verify serviceability and to detect

then only at the depot maintenance category.

electrical or mechanical failure by use of test

Rebuild reduces to zero the hours or miles the

equipment.

equipment, or component thereof, has been in

C-Service: To clean, to preserve, to charge, and

use.

d. Tools and Equipment, Column (4). This

to add fuel. lubricants, cooling agents, and

column is provided for referencing by code the special

air. If it is desired that elements, such as

tools and test equipment (sec. III) required to perform the

painting and lubricating, be defined

maintenance functions (sec. II).

separately, they may be so listed.

e. Remarks, Column (5). This column is

D-Adjust: To rectify to the extent necessary to

provided for referencing by code the remarks (sec. IV)

bring into proper operating range.

pertinent to the maintenance functions.

E-Align: To adjust specified variable elements of

an item to bring to optimum performance.

B-1