Application/Explana tion

TM 10-3930-643-24P

XC -

Installation drawing, diagram, instruction

sheet, field service drawing, that is identified

Stocked Items; use the applicable NSN to

by the manufacturer's part number.

request/requisition items with these source

Item is not stocked, Order an "XD''-coded

XD -

codes. They are authorized to the category

PC**

item through normal supply channels using

indicated by the code entered in the 3d

the CAGE and part number given, if no NSN

position of the SMR code.

is available.

NOTE: Cannibalization or controlled exchange, when

Items coded

are

subject

z**

authorized, may be used as a source of supply for items

deterioration.

with the above source codes, except for those source

coded "XA" or those aircraft support items restricted by

Items with these codes are not to be

requirements of AR 700-42.

requested/requisitioned individually. They

are part of a kit which is authorized to the

(2) Maintenance Code. Maintenance codes tell

maintenance category indicated in the 3d

you the level(s) of maintenance authorized to USE and

position of the SMR code. The complete kit

REPAIR support items. The maintenance codes are en-

must be requisitioned and applied.

tered in the third and fourth positions of the SMR code as

follows:

Items with these codes are not to

MO-(Made at UMI

(a) The maintenance code entered in the

AVUM Level)

requested/requisitioned

third position tells you the lowest maintenance level

individually, They must be made

MF-(Made at DS/

authorized to remove, replace, and use an item. The

from bulk material which is

AVUM Level)

maintenance code entered in the third position will indi-

identified by the part number in

MH-(Made at GS

cate authorization to one of the following levels of

the DESCRIPTION AND USABLE

Level)

maintenance.

ON CODE (UOC) column and

ML-(Made at Spe-

listed in the Bulk Material group

Application/Explanation

Code

cialized Repair

of the repair parts list in this

Activity (SRA))

Crew or operator maintenance done within

RPSTL. If the item is authorized

unit maintenance or aviation unit mainte-

MD-(Made at

to you by the 3d position code of

nance.

Depot)

the SMR code, but the source

code indicates it is made at a

Unit maintenance or aviation unit category

O-

higher level, order the item from

can remove, replace, and use the item.

the higher level of maintenance.

F-

Direct support or aviation intermediate level

can remove, replace, and use the item.

Items with these codes are not to

requested/requisitioned

H-

General support level can remove, replace,

individually. The parts that make

and use the item.

AO-(Assembled by

up the assembled item must be

UM/ AVUM

L-

Specialized repair activity can remove, re-

requisitioned or fabricated and

Level)

place, and use the item.

assembled at the level of

AF-(Assembled by

Depot level can remove, replace, and use

D-

maintenance indicted by the

DS/AVIM

the item.

source code. If the 3d position

Level)

code of the SMR code

AH-(Assembled by

(b) The maintenance code entered in the

authorizes you to replace the

fourth position tells whether or not the item is to be re-

GS Category)

item, but the source code

paired and identifies the lowest maintenance level with

AL-(Assembled by

indicates the item is assembled

the capability to do complete repair (i.e., perform all

SRA)

at a higher level, order the item

authorized repair functions). (NOTE: Some limited re-

AD-(Assembled by

from the higher level of

pair may be done on the item at a lower level of

Depot)

maintenance.

maintenance, if authorized by the Maintenance Alloca-

tion Chart (MAC) and SMR codes.) This position will

contain one of the following maintenance codes:

Application/Explanation

Code

XA -

Do not requisition an "XA''-coded item. Or-

O-

Unit maintenance or aviation unit is the low-

der its next higher assembly. (Also refer to

est level that can do complete repair of the

the NOTE following.)

item.

F-

Direct support or aviation intermediate is the

If an "XB" item is not available from salvage,

XB -

order it using the CAGE and part number

lowest level than can do complete repair of

the item.

given.