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TM 11-5915-223-24P
INTRODUCTION
1. Scope
Code
Definition
Not subject to automatic replenishment.
This manual lists spares and repair parts; special
XD -- A support item that is not stocked. When
tools; special test, measurement, and diagnostic
required, item will be procured through
equipment (TMDE), and other special support
normal supply channels.
equipment required for performance of organiza-
NOTE
tionl, direct support, and general support main-
Cannibalization or salvage may be used
tenance of the MX-7778/GRC. It authorizes the
as a source of supply for any items source
requisitioning and issue of spares and repair parts
coded above except those coded XA and
as indicated by the source and maintenance codes.
aircraft support items as restricted by AR
2. General
700-42.
(2) Maintenance code. Maintenance codes are
This Repair Parts and Special Tools List is divided
assigned to indicate the levels of maintenance
into the following sections:
authorized to USE and REPAIR support items.
a. Section II. Repair Parts List. A list of spares
The maintenance codes are entered in the third
and repair parts authorized for use in the
and fourth positions of the Uniform SMR Code
performance of maintenance. The list also includes
format as follows:
parts which must be removed for replacement of
(a) The maintenance code entered in the
the authorized parts. Parts lists are composed of
third position will indicate the lowest maintenance
functional groups in numeric sequence, with the
level authorized to remove, replace, and use the
parts in each group listed in figure and item
support item. The maintenance code entered in the
number sequence.
third position will indicate one of the following
b. Section III. Special Tools List. Not applicable.
levels of maintenance:
c. Section IV. National Stock Number and Part
Application/Explanation
Code
Number Index. A list, in National item identifica-
O -- Support item is removed, replaced, used at
tion number (NIIN) sequence, of all National stock
the organizational level.
numbers (NSN) appearing in the listings, followed
H -- Support item is removed, replaced, used at
by a list, in alphameric sequence, of all part
the general support level.
numbers appearing in the listings. National stock
D -- Support items that are removed, replaced,
numbers and part numbers are cross-referenced to
used at depot, mobile depot, specialized
each illustration figure and item number appear-
repair activity only.
ance.
(b) The maintenance code entered in the
3. Explanation of Columns
fourth position indicates whether the item is to be
repaired and identifies the lowest maintenance
a. Illustration. This column is divided as follows:
level with the capability to perform complete
(1) Figure number. Indicates the figure
repair (i.e., all authorized maintenance functions).
number of the illustration on which the item is
This position will contain one of the following
shown.
maintenance codes:
(2) Item number. The number used to identify
item called out in the illustration.
Application/Explanation
Code
b. Source, Maintenance, and Recoverability
H -- The lowest maintenance level capable of
(SMR) Codes.
complete repair of the support item is the
(1) Source code. Source code indicates the
general support level.
manner of acquiring support items for mainte-
Z--
Nonreparable. No repair is authorized.
nance, repair, or overhaul of end items. Source
(3) Recoverability code. Recoverability codes
codes are entered in the first and second positions
are assigned to support items to indicate the
of the Uniform SMR Code format as follows:
disposition action on unserviceable items. The
Definition
Code
recoverability code is entered in the fifth position
PA -- Item procured and stocked for anticipated
of the Uniform SMR Code format as follows:
or known usage.
Recoverability
Definition
codes
PD -- Support item, excluding support equip-
Z--
Nonreparable item. When unserviceable,
ment, procured for initial issue or outfit-
condemn and dispose at the level indi-
ting and stocked only for subsequent or
cated in position 3.
additional initial issues or outfitting.

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