TM 3-4310-100-20 & P
maintenance functions). This position will contain one of
the following maintenance codes.
KB--Item included in both a depot overhaul/repair kit
and a maintenance kit.
MO--Item to be manufactured or fabricated at
O--The lowest maintenance level capable of complete
repair of the support item is the organizational level.
MF--Item to be manufactured or fabricated at the direct
(3) Recoverability Code.
support maintenance level.
MH Item to be manufactured or fabricated at the general
codes and assigned to support items to indicate the
support maintenance level.
disposition action on unserviceable items.
MD--Item to be manufactured or fabricated at the depot
recoverability code is entered in the fifth position of the
Uniform SMR Code format as follows:
AO--Item to be assembled at organizational level.
AF--Item to be assembled at Direct Support level.
AH--Item to be assembled at general support
Z--Nonreparable item. When unserviceable, condemn
and dispose at the level indicated in position 3.
AD--Item to be assembled at depot maintenance level.
c. National Stock Number.
XA--Item is not procured or stocked because the
National stock number assigned to the item and which
requirements for the item will result in the
will be used for requisitioning.
replacement on the next higher assembly.
d. Part Number. Indicates the primary number
XB--Item is not procured or stocked. If not available
used by the manufacturer (individual, company, firm.
through salvage requisition.
corporation, or Government activity), which controls the
XC--Installation drawing, diagram, instruction sheet.
design and characteristics of the item by means of its
field service drawing, that is identified by
engineering drawings, specifications, standards, and
manufacturer's part number.
inspection requirements to identify an item or range of
XD--A support item is not stocked. When required,
item will be procured through normal supply
When a stock numbered item is
requisitioned, the item received may
have a different part number than the
Cannibalization or salvage may be
part being replaced.
used as a source of supply for any
items coded above except those
e. Federal Supply Code for Manufacturer
coded XA and aircraft support items
(FSCM). The FSCM is a 5-digit numeric code listed in
as restricted by AR 700-42.
SB 708-42 which is used to identify the manufacturer.
(2) Maintenance Code. Maintenance codes
distributor, or Government agency.
are assigned to indicate the levels of maintenance
Description. Indicates the Federal item name
authorized to USE and REPAIR support items.
and if required, a minimum description to identify -the
The maintenance codes are entered in the third and
fourth positions of the Uniform SMR Code format as
g. Unit of Measure (U/M). Indicates the standard
of the basic quantity of the listed item as used in
(a) The maintenance code entered in the third
performing the actual maintenance function.
position will indicate the lowest maintenance level
measure is expressed by a two-character alphabetical
authorized to remove, replace, and use the support item.
abbreviation (e.g., ea., in, pr. etc.). When the unit of
The maintenance code entered in the third position will
measure differs from the unit of issue, the lowest unit of
indicate one of the following levels of maintenance:
issue that will satisfy the required units of measure will
C-- Crew or operator maintenance performed within
h. Quantity Incorporated in Unit. Indicates the
quantity of the item used in the breakout shown on the
O-- Support item is removed, replaced, used at the
illustration figure, which is prepared for a functional
group, subfunctional group,-or an assembly.
b. The maintenance code entered in the fourth
position indicates whether the item is to be repaired and
C-4. Special Information
identifies the lowest maintenance level with the capability
a. Usable on codes are shown in the description
to perform complete repair (i.e., all