Appendix C. MAINTENANCE ALLOCATION CHART (MAC)

TM 9-4931-363-14&P

APPENDIX C

MAINTENANCE ALLOCATION CHART (MAC)

Section I. INTRODUCTION

h. Replace. The act of substituting a serviceable like

C-1. General.

t y p e part, subassembly, o r m o d u l e ( c o m p o n e n t o r

assembly) in a manner to allow the proper functioning of

This Maintenance Allocation Chart designates overall

an equipment/system.

responsibility for the performance of maintenance

functions for the fire control subsystem test set. The

i. Repair. The application of maintenance services

implementation of field maintenance tasks upon this test

(input, test, service, adjust, align, calibrate, replace) or

s e t will be consistent with the assigned maintenance

other maintenance actions (welding, grinding, riveting,

operations.

straightening, facing, remachining, or resurfacing) to restore

serviceability to an item by correcting specific damage,

C-2. Maintenance FunctionsC

fault, malfunction, or failure in a part, disassembly,

module/component/assembly end item or system.

Maintenance functions will be limited to and defined as

follows:

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

necessary to restore an item to a completely

a. Inspect. To determine the serviceability of an item

serviceable/operational condition as prescribed by

by comparing its physical, mechanical and/or electrical

maintenance standards (e.g., DMWR) in pertinent technical

publications. Overhaul is normally the highest degree of

characteristics with established standards through

examination.

maintenance performed by the Army. Overhaul does not

normally return an item to like new condition.

b. Test. To verify serviceability and detect incipient

failure by measuring the mechanical or electrical

k. Rebuild. Consists of those services/actions necessary

characteristics of an item and comparing those

for the restoration of unserviceable equipment to a like new

characteristics with prescribed standards.

c o n d i t i o n in accordance with original manufacturing

s t a n d a r d s . Rebuild is the highest degree of material

c. Service. Operations required periodically to keep an

maintenance applied to Army equipment. The rebuild

end item in proper operating condition, i.e., to clean, to

operation includes the act of returning to zero those age

preserve, to drain, to paint, or to replenish fuel, lubricants,

measurements (hours/miles, etc.) considered in classifying

hydraulic fluids, or compressed air supplies.

Army equipments/components.

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

l. Symbols. The uppercase letter placed in the

bringing into proper or exact position, or by setting the

appropriate column indicates the lowest level at which that

operating characteristics to specified parameters.

particular maintenance function is to be performed.

e. Align. To adjust specified variable elements of an

item to bring about optimum or desired performance.

C-3. Explanation of Format.

f. Calibrate. To determine and cause corrections to be

Purpose and use of the format are as follows.

made or to be adjusted on instruments or test measuring

and diagnostic equipments used in precision measurement.

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

Consists of comparisons of two instruments, one of which

numbers, the purpose of which is to identify components,

is a certified standard of known accuracy, to detect and

assemblies, subassemblies, and modules with the next

adjust any discrepancy in the accuracy of the instrument

higher assembly.

being compared.

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

b. Column 2. Functional Group. Column 2, lists the

n e x t higher assembly group and the item names of

position an item, part, or module (component or assembly)

i n a manner to allow the proper functioning of an

components, assemblies, subassemblies, and modules within

the group for which maintenance is authorized.

equipment or system.

C-1