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TM-11-5820-518-20P Radio Set AN/ARC-51X (NSN 5821-00-0B2-3698) and AN/ARC-51BX (NSN
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Special Information - TM-11-5820-518-20P0006


TM 11-5820-518-20P
SECTION I
INTRODUCTION
(2) Maintenance code. Maintenance codes are
1. Scope
assigned to indicate the levels of maintenance authorized
This manual lists spares and repair parts; special tools;
to USE and REPAIR support items. The maintenance
special test, measurement, and diagnostic equipment
codes are entered in the third and fourth positions of the
(TMDE), and other special support equipment required
Uniform SMR Code format as follows:
for performance of organizational maintenance of the
(a) The maintenance code entered in the third
AN/ARC-51X and AN/ARC-51BX. It authorizes the
position will indicate the lowest maintenance level
requisitioning and issue of spares and repair parts as in-
authorized to remove, replace, and use the support
dicated by the source and maintenance codes.
item. The maintenance code entered in the third posi-
tion will indicate one of the following levels of
2. General
maintenance:
This Repair Parts and Special Tools List is divided into
Code
Application/Explanation
the following sections:
O -- Support item is removed, replaced, used at the
a. Section II. Repair Parts List. A list of spares and
organizational level.
repair parts authorized for use in the performance of
(b) The maintenance code entered in the fourth
maintenance. The list also includes parts which must be
position indicates whether the item is to be repaired and
removed for replacement of the authorized parts. Parts
identifies the lowest maintenance level with the capability
lists are composed of functional groups in numeric se-
to perform complete repair (i. e., all authorized mainte-
quence, with the parts in each group listed in figure and
nance functions). This position will contain one of the
item number sequence.
following maintenance codes:
b. Section III. Special Tools List. Not applicable.
c. Section IV. National Stock Number and Part
Code
Application/Explanation
Number Index. A list, in National item identification
F -- The lowest maintenance level capable of complete
number (NIIN) sequence, of all National stock numbers
repair of the support item is the direct sup-
(NSN) appearing in the listings, followed by a list, in
port level.
alphanumeric sequence, of all part numbers appearing in
H -- The lowest maintenance level capable of complete
the listings. National stock numbers and part numbers
repair of the support item is the general sup-
are cross-referenced to each illustration figure and item
port level.
number appearance.
Z -- Nonreparable. No repair is authorized.
(3) Recoverability code. Recoverability codes are
3. Explanation of Columns
assigned to support items to indicate the disposition ac-
a. Illustration. This column is divided as follows:
tion on unserviceable items. The recoverability code is
(1) Figure number. Indicates the figure number the
entered in the fifth position of the Uniform SMR Code
illustration on which the item is shown.
format as follows:
(2) Item number. The number used to identify item
Recoverability
called out in the illustration.
codes
Definition
b. Source, Maintenance, and Recoverability (SMR)
Z -- Nonreparable item. When unserviceable, condemn
Codes.
and dispose at the level indicated in position 3.
(1) Source code. Source codes indicate the manner
F -- Reparable item. When uneconomically reparable,
of acquiring support items for maintenance, repair, or
condemn and dispose at the direct support level.
overhaul of end items. Source codes are entered in the
D -- Reparable item. When beyond lower level repair
first and second positions of the Uniform SMR Code
capability, return to depot. Condemnation and
format as follows:
disposal not authorized below depot level.
c. National Stock Number. Indicates the National
Code
Definition
stock number assigned to the item and will be used for
PA -- Item procured and stocked for anticipated or
requisitioning purposes.
known usage.
d. Part Number. Indicates the primary number used
NOTE
by the manufacturer (individual, company, firm, cor-
Cannibalization or salvage may be used as a
poration, or Government activity), which controls the
source of supply for any items source coded
design and characteristics of the item by means of its
above except those coded XA and aircraft
engineering drawings, specifications, standards, and in-
support items as restricted by AR 700-42.
1


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