APPENDIX B MAINTENANCE ALLOCATION CHART

TM 10-3930-638-24&P

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

B-1.

GENERAL

i. Repair. The application of maintenance services1 or

other maintenance actions2 to restore serviceability to an

item by correcting specific damage, fault, malfunction, or

a. This section provides a general explanation of all main-

failure in a part, subassembly, module (component or

tenance and repair functions authorized at various main-

assembly), and item, or system.

tenance levels.

j. Overhaul. That maintenance effort (service/actions)

b. The Maintenance Allocation Chart (MAC) in section II

necessary to restore an item to a completely serviceable/

designates overall responsibility for the performance of

operational condition as prescribed by maintenance stan-

maintenance functions on the identified component or

dards (i.e., DMWR) in appropriate technical publications.

assembly. The implementation of the maintenance func-

Overhaul is normally the highest degree of maintenance

tions upon the component or assembly will be consistent

performed by the Army. Overhaul does not normally return

with the assigned maintenance functions,

an item to like-new condition.

c. Section III lists the special tools and test equipment

k. Rebuild. Consist of those services{ actions necessary for

requirement for each maintenance function as referred

from section II.

the restoration of unserviceable equipment to a like-new

condition in accordance with original manufacturing stan-

d Section IV contains supplemental instructions or

explanatory notes for a particular maintenance function.

dards. Rebuild is the highest degree of material mainten-

ance applied to Army equipment. The rebuild operation

includes the act of returning to zero those age measure-

ments (hours/miles, etc.) considered in classifying Army

B-2. MAINTENANCE FUNCTIONS

equipments/components.

a. Inspect. To determine the serviceability of an item by

comparing its physical, mechanical and/or electrical char-

acteristics with established standards through examination.

B-3. COLUMN ENTRIES USED IN

b. Test. To verify serviceability and detect incipient fail-

THE MAC

ure by measuring the mechanical or electrical character-

istics of an item and comparing those characteristics with

prescribed standards.

a. Column 1, Group Number. Column 1 lists group num-

c. Service. Operations required periodically to keep an

bers, the purpose of which is to identify components, assem-

blies, and modules with the next higher assembly.

item in proper operating condition, i.e., to clean (decon-

b. Column 2, Component/Assembly. Column 2 contains

taminate); to preserve; to drain; to paint; or to replenish

the names of components, assemblies, subassemblies, and

fuel, lubricants, or hydraulic fluid.

modules for which maintenance is authorized.

d. Adjust. To maintain, within prescribed limits, by

c. Column 3, Maintenance Function. Column 3 lists the

bringing into proper or exact position, or by setting the

functions to be performed on the item listed in column 2.

operating characteristics to specified parameters.

(For detailed explanation of these functions, see para B-2.)

e. Align. To adjust specified variable elements of an item

d. Column 4, Maintenance Catagory. Column 4 specifies,

to bring about optimum or desired performance.

by the listing of a "work time" figure in the appropriate

f. Calibrate. To determine and cause corrections to be

subcolumn(s), the lowest level of maintenance authorized

made or to be adjusted on instruments or test measuring

to perform the function listed in column 3. This figure

and diagnostic equipments used in precision measurement.

represents the active time required to perform the main-

Consists of comparisons of two instruments, one of which

tenance functions at the indicated level of maintenance. If

is a certified standard of known accuracy, to detect and

the number or complexity of the tasks within the listed

adjust any discrepancy in the accuracy of the instrument

miaintenance function vary at different levels, appropriate

being compared.

"work time" figures will be shown for each level, The num-

g. Install. The act of emplacing, setting, or fixing into

position an item, component, or assembly in a manner to

ber of man-hours specified by the "work time" figures

allow the proper functioning of an equipment or system.

represents the average time required to restore an item

(assembly, subassembly, component, module, end item or

h. Replace. The act of substituting a serviceable-like part,

subassembly, or module (component or assembly) for an

system) to a serviceable condition. This time includes pre-

unserviceable counterpart.

paration time, troubleshooting time, and quality assurance/

Service Inspect, test, service, adjust, align, calibrate, or replace.

B-1

Action Welding, grinding, riveting, straightening, facing, remachining, or resurfacing.