b. Source, Maintenance, and Recoverability (SMR)
This manual lists spares and repair parts; special
(1) Source code. Source codes indicate the
tools; special test, measurement, and diagnostic
manner of acquiring support items for maintenance,
equipment (TMDE), and other special support equip-
repair, or overhaul of end items. Source codes are
ment required for performance of organizational,
entered in the first and second positions of the
direct support, and general support maintenance of
Uniform SMR Code format as follows:
the PP-6224A/U. It authorizes the requisitioning
and issue of spares and repair parts as indicated by
the source and maintenance codes.
PA -- Item procured and stocked for anticipated or
This Repair Parts and Special Tools List is divided
PD -- Support item, excluding support equipment,
into the following sections:
stocked only for subsequent or additional
repair parts authorized for use in the performance of
maintenance. The list also indicates parts which must
PE -- Support equipment procured and stocked for
be removed for replacement of the authorized parts.
initial issue or outfitting to specified main-
Parts lists are composed of functional groups' in
tenance repair activities.
numeric sequence, with the parts in each group listed
in figure and item number sequence.
XA -- Item is not procured or stocked because the
requirements for the item will result in the
replacement of the next higher assembly.
tools, special TMDE, and other special support equip-
XD -- A support item that is not stocked. When
ment authorized for the performance of maintenance.
required, item will be procured through
normal supply channels.
Number Index. A list, in National item identification
number (NIIN) sequence, of all National stock
Cannibalization or salvage maybe used as
numbers (NSN) appearing in the listings, followed by
a source of supply for any items source
a list, in alphameric sequence, of all part numbers
coded above except those coded XA and air-
appearing in the listings. National stock numbers and
craft support items as restricted by AR
part numbers are cross-referenced to each illustra-
tion figure and item number appearance.
(2) Maintenance code. Maintenance codes are
3. Explanation of Columns
assigned to indicate the levels of maintenance
a. Illustration. This column is divided as follows:
authorized to USE and REPAIR support items. The
maintenance codes are entered in the third and fourth
(1) Figure number. Indicates the figure number
positions of the Uniform SMR Code format as
of the illustration on which the item is shown.
(a) The maintenance code entered in the third
(2) Item number. The number used to identify
position will indicate the lowest maintenance level
item called out in the illustration.