APPENDIX B MAINTENANCE ALLOCATION CHART

TM 10-3930-634-12

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

B-l. General

characteristics with prescribed standards.

a. This section provides a general explanation of all

C. Service. Operations required periodically to

maintenance and repair functions authorized at

keep an item in proper operating condition, i.e., to

various maintenance levels.

clean, to preserve, to drain, to paint, or to replenish

b. Section II designates overall responsibility for the

fuel, lubricants, hydraulic fluids, or compressed air

performance of maintenance functions on the iden-

supplies.

tified end item or component and the work measure-

D. Adjust. To maintain within prescribed limits,

ment time required to perform the functions by the

by bringing into proper or exact position, or by setting

desiginated maintenance level. The implementation of

the operating characteristics to specified parameters.

the maintenance functions upon the end item or com-

E. Aline. To adjust specified parts of an item to

ponent will be consistent with the assigned mainte-

bring about optimum or desired performance.

nance functions.

F. Calibrate. To determine and cause corrections

c. Section III lists the special tools and test equip-

to be made or to be adjusted on instruments or test

ment required for each maintenance function as refer-

measuring and diagnostic equipments used in precision

enced from Section II.

measurement. Consists of comparisons of two instru-

d. Section IV contains supplemental instructions or

ments, one of which is a certified standard of known

explanatory notes for a particular maintenance func-

accuracy, to detect and adjust any discrepancy in the

tion.

accuracy of the instrument being compared.

G. Install. The act of emplacing, seating, or fixing

B-2. Explanation of Columns in Section II

into position an item, part, or module (component or as-

a. Column (1), Group Number. A number is

sembly) in a manner to allow the proper functioning of

assigned to each group in a top down breakdown se-

an equipment or system.

quence. The applicable groups are listed in the MAC in

H. Replace. The act of substituting a serviceable

disassembly sequence beginning with the first group

like type part, subassembly, or module (component or

removed.

assembly) for an unserviceable counterpart.

b. Column (2), Functional Group. This column con-

I. Repair. The application of maintenance services

tains a brief description of the components of each

(inspect, test, service, adjust, align, calibrate, or

numerical group.

replace) or other maintenance actions (welding, grind-

c. Column (3), Maintenance Functions. This column

ing, riveting, straightening, facing, remachining or

lists the various maintenance functions (A through K).

resurfacing) to restore serviceability to an item by cor-

The lowest maintenance level authorized to perform

recting specific damage, fault, malfunction, or failure

these functions is indicated by a symbol in the ap-

in a part, subassembly, module (component or assem-

propriate column. Work measurement time standards

bly), end item, or system.

(the active repair time required to perform the mainte-

J. Overhaul. The maintenance effort (ser-

nance function) are shown directly below the symbol

vice/action) necessary to restore an item to a com-

identifying the maintenance level: The symbol desig-

pletely serviceable/operational condition as prescribed

nations for the various maintenance levels are as

by maintenance standards (i.e., DMWR) in appropriate

follows:

technical publication. Overhaul is normally the highest

C-Operator or Crew

degree of maintenance performed by the Army. Over-

O-Organizational maintenance

haul does not normally return an item to like new con-

F-Direct support maintenance

dition.

H-General support maintenance

K. Rebuild. Consists of those services/actions

D-Depot maintenance

The maintenance functions are defined as follows:

necessary for the restoration of unserviceable equip-

ment to a like new condition in accordance with origi-

A. Inspect. To determine serviceability of an item

nal manufacturing standards. Rebuild is the highest

by comparing its physical, mechanical, and electrical

characteristics with established standards through ex-

degree of materiel maintenance applied to Army

equipment. The rebuild operation includes the act of

amination.

returning to zero those age measurement (hours/miles,

B. Test. To verify serviceability and detect early

signs of failure by measuring the mechanical or electri-

etc.) considered in classifying Army equip-

ment/components.

cal characteristics of an item and comparing those

B-1