MD - Item to be manufactured or fabricated at the depot
This manual lists spares and repair parts; special tools;
special test, measurement, and diagnostic equipment
AF - Item to be assembled at direct support
(TMDE), and other special support equipment required
for performance of direct support and general support
AD - Item to be assembled at depot maintenance level.
maintenance of the T1428/FRN, TN588/FRN and
XA - Item is not procured or stocked because the
SA2318/FRN. It authorizes the requisitioning and issue
requirements for the item will result in the
of spares and repair parts as indicated by the source
replacement of the next higher assembly.
and maintenance codes.
XD - A support item that is not stocked.
required, item will be procured through normal
This Repair Parts and Special Tools List is divided into
the following sections:
a. Section II. Repair Parts List. A list of spares
Cannibalization or salvage may be
and repair parts authorized for use in the performance of
maintenance. The list also includes parts which must be
used as a source of supply for any
removed for replacement of the authorized parts. Parts
items source coded above except
lists are composed of functional groups in numeric
those coded XA and aircraft support
sequence, with the parts in each group listed in figure
items as restricted by AR 700-42.
and item number sequence.
b. Section III. Special Tools List. Not applicable.
(2) Maintenance code. Maintenance codes
c. Section IV National Stock Number and Part
are assigned to indicate the levels of maintenance
Number Index. A list, in National item identification
authorized to USE and REPAIR support items. The
number (NIIN) sequence, of all National stock numbers
maintenance codes are entered in the third and fourth
(NSN) appearing in the listings, followed by a list, in
positions of the Uniform SMR Code format as follows:
alphanumeric sequence, of all part numbers appearing
(a) The maintenance code entered in the
in the listings.
National stock numbers and part
third position will indicate the lowest maintenance level
numbers are cross-referenced to each illustration figure
authorized to remove, replace, and use the support
and item number appearance.
item. The maintenance code entered in the third
Explanation of Columns
position will indicate one of the following levels of
a. Illustration. This column is divided as follows:
(1) Figure number.
Indicates the figure
number of the illustration on which the item is shown.
O - Support item is removed, replaced, used at the
(2) Item number. The number used to identify
item called out in the illustration.
F - Support item is removed, replaced, used at the
b. Source, Maintenance, and Recoverability (SMR)
direct support level.
H - Support item is removed, replaced, used at the
(1) Source code. Source codes indicate the
general support level.
(b) The maintenance code entered in the
manner of acquiring support items for maintenance,
repair, or overhaul of end items. Source codes are
fourth position indicates whether the item is to be
entered in the first and second positions of the Uniform
repaired and identifies the lowest maintenance level
SMR Code format as follows:
with the capability to perform complete repair (i.e., all
authorized maintenance functions). This position will
contain one of the following maintenance codes:
PA - Item procured and stocked for anticipated or
MH - Item to be manufactured or fabricated at the
F - The lowest maintenance level capable of
general support maintenance level.
complete repair of the support item is the direct