APPENDIX B MAINTENANCE ALLOCATION CHART

TM 10-3930-632-12

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

B-1. General

d. Adjust. To maintain or regulate, within

a. This section provides a general explanation

prescribed limits, by bringing into proper or exact

position, or by setting the operating characteristics to

of all maintenance and repair functions authorized at

specified parameters.

various maintenance categories

e. Aline. To adjust specified variable elements

b. The Maintenance Allocation Chart (MAC) in

of an item to bring about optimum or desired

section II designates overall authority and responsibility

performance.

for the performance of maintenance functions on the

f. Calibrats. To determine and cause correction

identified end item or component. The application of

to be made or to be adjusted on instruments or test,

the maintenance function on the end item or component

measuring, and diagnostic equipment used in precision

will be consistent with the capacities and capabilities of

measurement.

Consists of comparisons of two

the designated maintenance categories.

c. Section III lists the tools and test equipment

instruments, one of which is a certified standard of

known accuracy, to detect and adjust any discrepancy in

(both special tools and common tool sets) required for

the accuracy of the instrument being compared.

each maintenance function as referenced from section

g. Remove/Install. To remove and install the

II.

d. Section IV contain supplemental instructions

same item when required to perform service or other

maintenance functions. Install may be the act of

and explanatory notes for a particular maintenance

emplacing, eating, or fixing into position a space, repair

function.

part, or module (component or assembly) in a manner to

B-2. Maintenance Functions. Maintenance functions

allow the proper functioning of an equipment or system.

h. Replace. To remove an unserviceable item

will be limited to and defined as follows:

a. Inspect. To determine the serviceability of

and in-al a serviceable counterpart in its place.

"Replace" is authorized by the MAC and is shown as the

an item by comparing its physical, mechanical, and/or

third position of the SMR code.

electrical characteristics with established standards

i. Repair. The application of maintenance

through examination (e.g., by sight, sound, or feel).

b. Test. To verify serviceability by measuring

service , including fault location/troubleshooting ,

removal/installation, disassembly/assembly procedures,

the mechanical, pneumatic, hydraulic, or electrical

and maintenance actions to identify troubles and

characteristics of an item and comparing those

restore serviceability to an item by correcting specific

characteristics with prescribed standards.

c. Service. Operations required periodically to

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

subassembly, module (component or assembly), end

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

item, or system.

(including decontaminate, when required), preserve,

drain, paint, or replenish fuel, lubricants, chemical fluids,

or gases.

Service - inspect, test, service, adjust, aline, calibrate, and/or replace.

Fault location/troubleshooting - The process of investigating and detecting the cause of equipment malfunctioning; the

act of isolating a fault within a system or unit under test (UUT).

Disassembly/assembly - encompasses the step-by-step taking apart (or breakdown) of a spare/functional group coded

item to the level of its least componency identified as maintenance significant (i.e., alined an SMR code) for the category

of maintenance under consideration.

Action - welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.

Change 2 B-1