TM 10-8400-203-23&P. Manual - part 33

 

 

 

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SUPPORTING INFORMATION 

MAINTENANCE ALLOCATION CHART (MAC) 

INTRODUCTION 
 
The Army Maintenance System MAC 
 
This introduction provides a general explanation of all maintenance and repair functions authorized at the 
two maintenance levels under the Two-Level Maintenance System concept. 
The MAC (immediately following the introduction) designates overall authority and responsibility for the 
performance of maintenance functions on the identified end item or component. The application of the 
maintenance functions to the end item or component shall be consistent with the capacities and 
capabilities of the designated maintenance levels, which are shown on the MAC in column (4) as: 
 

Field – includes two subcolumns, Crew (C) and Maintainer (F).  
Sustainment – includes two subcolumns, Below Depot (H) and Depot (D). 
 

The maintenance to be performed at field and sustainment levels is described as follows: 
 

1.  Crew maintenance. The responsibility of a using organization to perform maintenance on its 

assigned equipment. It normally consists of inspecting, servicing, lubricating, adjusting, and 
replacing parts, minor assemblies, and subassemblies. The replace function for this level of 
maintenance is indicated by the letter "C" in the third position of the SMR code. A "C" appearing in 
the fourth position of the SMR code indicates complete repair is possible at the crew maintenance 
level. 
 

2.  Maintainer maintenance. Maintenance accomplished on a component, accessory, assembly, 

subassembly, plug-in unit, or other portion either on the system or after it is removed. The replace 
function for this level of maintenance is indicated by the letter "F" appearing in the third position of 
the SMR code. An "F" appearing in the fourth position of the SMR code indicates complete repair 
is possible at the field maintenance level. Items are returned to the user after maintenance is 
performed at this level. 
 

3.  Below depot sustainment. Maintenance accomplished on a component, accessory, assembly, 

subassembly, plug-in unit, or other portion either on the system or after it is removed. The replace 
function for this level of maintenance is indicated by the letter "H" appearing in the third position of 
the SMR code. An "H" appearing in the fourth position of the SMR code indicates complete repair 
is possible at the below depot sustainment maintenance level. Items are returned to the supply 
system after maintenance is performed at this level. 
 

4.  Depot sustainment. Maintenance accomplished on a component, accessory, assembly, 

subassembly, plug-in unit, or other portion either on the system or after it is removed. The replace 
function for this level of maintenance is indicated by the letter "D" or "K" appearing in the third 
position of the SMR code. Depot sustainment maintenance can be performed by either depot 
personnel or contractor personnel. A "D" or "K" appearing in the fourth position of the SMR code 
indicates complete repair is possible at the depot sustainment maintenance level. Items are 
returned to the supply systems after maintenance is performed at this level. 

 
The tools and test equipment requirements table (immediately following the MAC) lists the tools and test 
equipment (both special tools and common tool sets) required for each maintenance function as 
referenced from the MAC. 
 
The remarks table (immediately following the tools and test equipment requirements) contains 
supplemental instructions and explanatory notes for a particular maintenance function. 

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Maintenance Functions 
 
Maintenance functions are 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 (e.g., by sight, sound, or 
feel).  This includes scheduled inspection and gagings and evaluation of cannon tubes. 

 
2.  Test. To verify serviceability by measuring the mechanical, pneumatic, hydraulic, or electrical 

characteristics of an item and comparing those characteristics with prescribed standards on a 
scheduled basis, i.e., load testing of lift devices and hydrostatic testing of pressure hoses. 

 

3.  Service. Operations required periodically to keep an item in proper operating condition, e.g., to 

clean (includes decontaminate, when required), to preserve, to drain, to paint, or to replenish fuel, 
lubricants, chemical fluids, or gases.  This includes scheduled exercising and purging of recoil 
mechanisms.  The following are examples of service functions: 

 

a.  Unpack. To remove from packing box for service or when required for the performance of 

maintenance operations. 

 
b.  Repack. To return item to packing box after service and other maintenance operations. 
 
c.  Clean. To rid the item of contamination. 

 

d.  Touch up. To spot paint scratched or blistered surfaces. 

 

e.  Mark. To restore obliterated identification.  

 

4.  Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by 

setting the operating characteristics to 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 of 

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.  Remove/Install. To remove and install the same item when required to perform service or other 

maintenance functions.  Install may be the act of emplacing, seating, or fixing into position a 
spare, repair part, or module (component or assembly) in a manner to allow the proper functioning 
of an equipment or system. 

 

8.  Paint (Ammunition Only). To prepare and spray color coats of paint so that the ammunition can be 

identified and protected. The color indicating primary use is applied, preferably, to the entire 
exterior surface as the background color of the item. Other markings are to be repainted as 
original so as to retain proper ammunition identification. 

 

9.  Replace. To remove an unserviceable item and install a serviceable counterpart in its place. 

“Replace” is authorized by the MAC and assigned maintenance level is shown as the third position 
code of the Source, Maintenance and Recoverability (SMR) code. 

 

10.  Repair. The application of maintenance services, including fault location/troubleshooting, 

removal/installation, disassembly/assembly procedures and maintenance actions to identify 
troubles and restore serviceability to an item by correcting specific damage, fault, malfunction, or 
failure in a part, subassembly, module (component or assembly), end item, or system. 

 

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NOTE 

 

The following definitions are applicable to the “repair” maintenance function:  

 

Services.  Inspect, test, service, adjust, align, 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. The step-by-step breakdown (taking apart) of a spare/functional 
group coded item to the level of its least component, that is assigned an SMR code for 
the level of maintenance under consideration (i.e., identified as maintenance significant). 

 

Actions. Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing. 

 

11.  Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely 

serviceable/operational condition as required by maintenance standards in appropriate 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. 

 

12.  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 material maintenance applied to Army equipment.  The rebuild operation 
includes the act of returning to zero those age measurements (e.g., hours/miles) considered in 
classifying Army equipment/components. 

 

Explanation of Columns in the MAC 

 

Column (1) Group Number. Column (1) lists Functional Group Code (FGC) numbers, the purpose of 
which is to identify maintenance significant components, assemblies, subassemblies, and modules with 
the Next Higher Assembly (NHA). 
Column (2) Component/Assembly. Column (2) contains the item names of components, assemblies, 
subassemblies, and modules for which maintenance is authorized. 
Column (3) Maintenance Function. Column (3) lists the functions to be performed on the item listed in 
column (2). (For a detailed explanation of these functions refer to “Maintenance Functions” outlined 
above). 
Column (4) Maintenance Level. Column (4) specifies each level of maintenance authorized to perform 
each function listed in column (3), by indicating work time required (expressed as manhours in whole 
hours or decimals) in the appropriate subcolumn. This work time figure represents the active time 
required to perform that maintenance function at the indicated level of maintenance. If the number or 
complexity of the tasks within the listed maintenance function varies at different maintenance levels, 
appropriate work time figures are to be shown for each level. The work time figure represents the average 
time required to restore an item (assembly, subassembly, component, module, end item, or system) to a 
serviceable condition under typical field operating conditions. This time includes preparation time 
(including any necessary disassembly/assembly time), troubleshooting/fault location time, and quality 
assurance time in addition to the time required to perform the specific tasks identified for the maintenance 
functions authorized in the MAC. The symbol designations for the various maintenance levels are as 
follows: 

Field: 

 
 
 

Sustainment: 

 

C Crew 

maintenance 

F Maintainer 

maintenance 

L 

Specialized Repair Activity (SRA) 

H Below 

Depot 

Maintenance 

D Depot 

maintenance 

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NOTE 

 

The “L” maintenance level is not included in column (4) of the MAC.  Functions to this 
level of maintenance are identified by work time figure in the “H” column of column (4), 
and an associated reference code is used in the REMARKS column (6).  This code is 
keyed to the remarks and the SRA complete repair application is explained there.   

 

Column (5) Tools and Equipment Reference Code.  Column (5) specifies, by code, those common tool 
sets (not individual tools), common Test, Measurement and Diagnostic Equipment (TMDE), and special 
tools, special TMDE, and special support equipment required to perform the designated function.  Codes 
are keyed to the entries in the tools and test equipment table. 
 
Column (6) Remarks Code.  When applicable, this column contains a letter code, in alphabetic order, 
which is keyed to the remarks table entries.  
 
Explanation of Columns in the Tools and Test Equipment Requirements 
 
Column (1) – Tool or Test Equipment Reference Code. The tool or test equipment reference code 
correlates with a code used in column (5) of the MAC. 
Column (2) – Maintenance Level. The lowest level of maintenance authorized to use the tool or test 
equipment. 
Column (3) – Nomenclature. Name or identification of the tool or test equipment. 
Column (4) – National Stock Number (NSN). The NSN of the tool or test equipment. 
Column (5) – Tool Number. The manufacturer's part number. 
 
Explanation of Columns in Remarks 
 
Column (1) – Remarks Code. The code recorded in column (6) of the MAC. 
Column (2) – Remarks. This column lists information pertinent to the maintenance function being 
performed as indicated in the MAC. 
 
END OF WORK PACKAGE 

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SUPPORTING INFORMATION 

 

INDIVIDUAL EQUIPMENT 

MAINTENANCE ALLOCATION CHART (MAC)

 

 

Table 1.  MAC for Individual Equipment.

 

(1) 

 
 

GROUP 

NUMBER 

(2) 

 
 

COMPONENT/ 

ASSEMBLY 

(3) 

 
 

MAINTENANCE 

FUNCTION 

(4) 

MAINTENANCE LEVEL 

(5) 

 

TOOLS AND 
EQUIPMENT 

REF CODE 

(6) 

 
 

REMARKS 

CODE 

FIELD SUSTAINMENT 

CREW MAINTAINER

BELOW 

DEPOT 

DEPOT 

C F  H 

D 

01 

LEGACY SLEEP SYSTEMS  Service 

Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

02 MODULAR 

SLEEP 

SYSTEM 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

03 ARCTIC 

GEAR 

Service 
Inspect 
Repair 
Test 

 1.0 

1.0 
1.0 
0.5 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

04 MOUNTAINEERING 

GEAR 

Service 
Inspect 

 1.0 

1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

05 GENERAL 

BAGS 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

06 LOAD 

BEARING 

EQUIPMENT 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

07 ALICE 

GEAR 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

08 CHEMICAL 

PROTECIVE 

GEAR 

Service 
Inspect 

 1.0 

1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

09 PASGT 

HELMET 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Table 1.  MAC for Individual Equipment. – Continued  

 

(1) 

 
 

GROUP 

NUMBER 

(2) 

 
 

COMPONENT/ 

ASSEMBLY 

(3) 

 
 

MAINTENANCE 

FUNCTION 

(4) 

MAINTENANCE LEVEL 

(5) 

 

TOOLS AND 
EQUIPMENT 

REF CODE 

(6) 

 
 

REMARKS 

CODE 

FIELD SUSTAINMENT 

CREW MAINTAINER

BELOW 

DEPOT 

DEPOT 

C F  H 

D 

10 CVC 

HELMET 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

11 

CVC BODY ARMOR 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

12 LEGACY 

BODY 

ARMOR 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

13 BASIC 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

 

 

 

 

 

 

 

 

 

 

14 ACH 

Service 
Inspect 
Repair 

 1.0 

1.0 
1.0 

  

 

A, 

B 

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Table 2.  Tools and Test Equipment for Individual Equipment.

 

(1) 
Tools or 
Test 
Equipment 

(2) 
Maintenance 
Level 

(3) 
 
Nomenclature 

(4) 
National Stock 
Number 

(5) 
 
Tool Number 

1 

F, H 

DIE TOOL, FASTENER 

5120-00-090-4412 

1401 

2 

F, H 

DIE, EYELET 

5120-00-144-2097 1442097 

3 

F, H 

FILE, HAND, FLAT 

5110-00-249-2848 

A-A-2311 

4 

F, H 

GIMLET 5110-00-725-1095 

 

5 

F, H 

GUN, GLUE 

LOCAL PURCHASE   

6 

F, H 

HEATED BLADE CUTTER 

LOCAL PURCHASE   

7 

F, H 

HOLDER, DIE 

5120-00-357-6181 

00-357-6181 

8 

F, H 

HOLDER, DIE FASTENER 

5120-00-357-6177 

192 

9 

F, H 

KNIFE, HOT METAL 

LOCAL PURCHASE   

10 

F, H 

PLIERS, DIAGONAL CUTTING  5110-00-222-2708 

220-7NS 

11 

F, H 

PLIERS, LINEMAN’S 

5120-00-756-1156 

B107.20M 

12 

F, H 

PLIERS, NEEDLE NOSE 

5120-01-021-7473 

B107.13M 

13 

F, H 

PLIERS, SLIP JOINT 

5120-00-223-7396 

 

14 

F, H 

PRESS, GROMMET AND 
EYELET, HAND OPERATED 

5120-00-880-0619 M370 

15 

F, H 

PUNCH AND DIE, GROMMET 
INSERTING, NO 00 

5210-00-357-5753 216-00 

16 

F, H 

PUNCH AND DIE, GROMMET 
INSERTING, SIZE 0 

5120-00-221-1146 217-0 

17 

F, H 

PUNCH, CUTTING, DOUBLE 
BOW 

5110-00-180-0924 149-5/8 

18 

F, H 

PUSH DRILL 

5110-00-293-3410 

 

19 

F, H 

RULER, TAB, METAL, 16 
INCHES 

7510-00-173-4897 (93287) 

20 

F, H 

SCALE (FOR BASIC WEIGHT 
TEST) 

LOCAL PURCHASE   

21 

F, H 

SCALE, WEIGHING, 0-10 LB. 

6670-00-240-5821 

A-A-50062 

22 

F, H 

SCISSORS, 8-INCH 

LOCAL PURCHASE   

23 

F, H 

SCREWDRIVER, FLAT TIP 

5120-00-596-8502 

 

24 

F, H 

SCREWDRIVER, FLAT-TIP, 1/4-
INCH 

5120-00-596-8653 B107.15 

25 

F, H 

SEWING MACHINE, BARTACK, 
INDUSTRIAL 

LOCAL PURCHASE  RECOMMENDE

D  JUKI L-K-1900 
A-HS (8N184) 

26 

F, H 

SEWING MACHINE, BOX X 

LOCAL PURCHASE  RECOMMENDE

D  JUKI LK-
1900A-HS 
(8N184)