SECTION III - NUMERICAL INDEX-CONT.

AIR FORCE

T.O. 31 S5-4-898-4

ARMY

TM 11-5895-1146-24P

MARINE CORPS

TM SL-4-08049A

e. USMC SMR CODE Column (Marine Corps only). This column lists the SMR codes which are assigned to

parts subordinate to or associated with an end item; that is, spares or repair parts. The uniform code format is comprised

of three parts: a two-position source code; a two-position maintenance code; and a one-position recoverability code. The

SMR code provides the user with the following iniforliation for each part:

(1)

Method (source) of obtaining the part; for example, by requisition, fabrication, or salvage.

NOTE

Maintenance and recoverability codes are not applicable when the following source codes are used: XA, XB, and

XC.

(2) The lowest maintenance echelon authorized to remove, replace, and use the part; and the lowest

echelon capable of performing a complete repair.

(3) Disposition (recoverability) action on unserviceable parts.

NOTE

The numerical index USMC SMR CODE column lists Marine Corps codes only. Refer to MPL SMR CODE

column in Section II for Air Force/Army codes.

USMC SSI CODE Column (Marine Corps only). This column lists the conditions for stocking unique

maintenance parts (those assigned NSNs and coded in the P series (source) of the SMR code). The SSI codes are as

follows:

(1) No code - indicates that the part may or may not be authorized in initial allowances to using or

supporting organizations. The initial allowance is explained in the REPL Factor description which follows.

(2) I - applied to maintenance parts for which predicted consumption would not warrant inclusion in mount-

out but, for which a quantity of one is authorized as insurance for mount-out using a 360-day criteria based on the total

density of equipment employed by the DIV/WING team. Mount-out allowances, so authorized, will be stocked by the FSR

or MWSG for Marine wing peculiar equipment, as applicable.

(3) D - applied to maintenance parts that are not considered critical or essential stockage; therefore, they

are not authorized in initial allowances However, these items are stocked within the supply system and may be

requisitioned when needed.

(4) T - indicates that the part is authorized m garrison operating allowances to comply with state and local

laws; however, the part Is not authorized in mix,. ,t-out since it is not combat essential.

g. USMC REPL FACTOR Column (Marine Corps only). This column lists the replacement factor assigned to

each national stock numbered maintenance repair part. The REPL factor is a decimal number which indicates the

average rate at which the type of part so coded has been used by Marine Corps field units, or the rate at which design

engineers anticipate the part will fail, wear out, or otherwise require replacement. All computations are based on a

replacement period of 1 year.

(1) Initial authorized stockage levels of consumable and salvageable parts for an organization are to be

computed for predicted consumption based on the number of parts employed and/or supported by an organization within

the number of days for which stockage is authorized. In computing garrison operating stock or mount-out, authorized

levels can be determined by the requiring Marine Corps unit by multiplying the REPL factor times the quantity used per

equipment times the number of end Items employed by the using organization or supported by the service organization

times the authorized day level expressed in months and divided by 12. Specific formulas and examples are provided in

Marine Corps Order (MCO) P4400 79. The REPL factors used in initial stockage computations should be revised, if

warranted. after significant usage is experienced, in accordance with guidelines of MCO 4400.32A. Use the following

formula for revising the REPL factors based on actual usage. W equals the revised REPL factor. X is the usage

experience of 1 year; A is the application per equipment; and B is the number of equipments supported.

A+B

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