c. Federal Stock Number and Reference Number
Code
Explanation
A list, in ascending numerical
AO Item to be assembled at organizational level.
sequence, of all Federal stock numbers appearing in the
AF Item to be assembled at the direct support
listings, followed by a list, in alphameric sequence, of all
maintenance level.
reference numbers appearing in the listings. Federal
AH Item to be assembled at the general support
stock numbers and reference numbers are cross-
maintenance level.
referenced to each illustration figure and item number
AD Item to be assembled at depot maintenance level.
appearance.
XA Item is not procured or stocked because the
requirements for the item will result in the
replacement of the next higher assembly.
3. Explanation of Columns
XB Item is not procured or stocked. If not available
The following provides an explanation of columns
through salvage, requisition it.
found in the tabular listings.
XC Installation drawing, diagram, instruction sheet, field
a. Source, Maintenance, and Recoverability Codes
service drawing, that is identified by a
(SMR), (5 Column Positions).
manufacturer's part number.
(1) Source codes (positions 1 and 2). This
NOTE
column position indicates the source for the listed items.
Cannibalization or salvage may be
Source codes are:
Code
Explanation
used as a source of supply for any
items source coded above except
PA Item procured and stocked for anticipated or known
those coded XA and aircraft support
usage.
items as restricted by AR 700-42.
PB Item procured and stocked for insurance purposes
because essentially dictates that a minimum
(2) Maintenance codes (positions 3 and 4).
quantity be available in the supply systems.
(a) Position 3. The maintenance code
PC Item procured and stocked and which otherwise
would be coded PA except that it is deteriorative in
entered in the column's third position indicates the lowest
nature.
maintenance level authorized to remove, replace, and
PD Support item, excluding support equipment,
use the support item. Capabilities of higher maintenance
procured for initial issue or outfitting and stocked
categories are considered equal or better. Maintenance
only for subsequent or additional initial issues or
codes are:
outfittings. Not subject to automatic replenishment.
Code
Explanation
PE Support equipment procured and stocked for initial
issue or outfitting to specified maintenance repair
C
Crew/operator
activities.
O
Organizational maintenance
PF Support equipment which will not be stocked but
F
Direct support maintenance
which will be centrally procured on demand.
H
General support maintenance
PG Item procured and stocked to provide for sustained
D
Depot maintenance
support for the life of the equipment. It is applied to
(b) Position 4. The maintenance code
an item peculiar to the equipment which, because
of probable discontinuance or shutdown of
entered in the column's fourth position indicates whether
production facilities, would prove uneconomical to
the item is to be repaired and identifies the lowest
reproduce at a later time.
maintenance level with the capability to perform
KD Item of a depot overhaul/repair kit and not
complete repair (i.e., all authorized maintenance
purchased separately. A depot kit is defined as a
functions).
Capabilities of higher maintenance
kit that provides items required at the time of
categories are considered equal or better. Maintenance
overhaul or repair.
codes are:
KF Item of a maintenance kit and not purchased
Code
Explanation
separately. A maintenance kit is defined as a kit
that provides an item that can be replaced at
O
Organizational maintenance
organizational
or
intermediate
levels
of
F
Direct support maintenance
maintenance.
H
General support maintenance
KB Item included in both a depot overhaul/repair kit and
D
Depot maintenance
a maintenance kit.
Z
Non-repairable. No repair is authorized
MO Item to be manufactured or fabricated at
(3) Recoverability code (position 5). This
organizational level.
MF Item to be manufactured or fabricated at the direct
column position indicates whether unserviceable items
support maintenance level.
should be returned for recovery or salvage.
MH Item to be manufactured or fabricated at the
Recoverability codes are:
general support maintenance level.
MD Item to be manufactured or fabricated at depot
Code
Explanation
maintenance level.
Z
Nonrepairable item.
When unserviceable,
condemn it and dispose of it at the level indicated in
position 3.
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