Appendix B. MAINTENANCE ALLOCATION CHART

TM 55-4920-328-13

APPENDIX B

MAINTENANCE ALLOCATION CHART

Section I. INTRODUCTION

B-1. General.

The purpose of the maintenance allocation chart is to provide all activities with authorized maintenance functions to be

performed at each level of maintenance.

B-2. Explanation of format.

Purpose and use of the format are as follows:

a. Column 1. Group number. Column 1 lists group numbers, the purpose of which is to match components,

assemblies, subassemblies and modules with the next higher assembly.

b. Column 2. Functional group. Column 2 lists the next higher assembly group and the item names of co ponents,

assemblies, subassemblies and modules within the group for which maintenance is authorized.

Column 3. Maintenance functions. Maintenance functions shall be limited to and defined as follows:

(1) Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical

characteristics with established standards through examination.

(2) Test. To verify serviceability and to detect incipient failure by measuring the mechanical or electrical

characteristics of an item and comparing those characteristics with prescribed standards.

(3) Service. Operations required periodically to keep an item in proper operating condition, i. e. , to clean, preserve,

drain, paint, or to replenish fuel/lubricants/hydraulic fluids or compressed air supplies.

(4) Adjust. Maintain within prescribed limits by bringing into proper or exact position, or by setting the operating

characteristics to the specified parameters.

(5) Align. To adjust specified variable elements of an item to bring about optimum or desired performance.

(6) Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test measuring

and diagnostic equipment used in precision measurement. Consists of comparisons of two instruments, one of which is a

certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being

compared.

(7) Install. The act of emplacing,. seating, or fixing into position an item, part, mod le (component or assembly) in a

manner to allow the proper functioning of the equipment/system.

(8) Replace. The act of substituting a serviceable like-type part, subassembly, module (component or assembly) in a

manner to allow the proper functioning of an equipment/system.

(9) Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, replace) or other

maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to restore serviceability

to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module/component/

assembly, end item or system.

(10) Overhaul.

That maintenance effort (service/action) necessary to

restore an item to a completely

serviceable/operational condition as prescribed by maintenance standards (e. g. , DMWR) in pertinent technical

publications. Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not

normally return an item to like new condition.

(11) Rebuild. Consists of those services/ actions necessary for the restoration of unserviceable equipment to a like-

new condition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel maintenance

applied to Army equipment. The rebuild operation includes the act of returning to zero those age measurements '(hours,

miles, etc. ) considered in classifying Army equipment/components.

B-1