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TM-55-1730-221-20P Jack Hydraulic Aircraft 10-Ton Type A-6 PN 53D22004 Manual
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Special Information. - TM-55-1730-221-20P0005
TM 55-1730-221-20P
Section I. INTRODUCTION
Code
Definition
1. Scope.
PA
---
Item procured and stocked for
anticipated or known usage.
This manual lists spares and repair parts required
for performance of Aviation Unit Maintenance (AVUM)
PB
---
Item procured and stocked for
of the 10 ton hydraulic aircraft hand jack, type A-6, PN
insurance  purpose  because
53D22004. It authorizes the requisitioning and issue of
essentiality  dictates  that  a
spares and repair parts as indicated by the source and
minimum quantity be available
maintenance codes. NOTE: For detailed explanation
in the supply systems.
of the Three Levels of Maintenance Concept, see
Appendix A to this Section.
PC
---
Item procured and stocked and
which otherwise would be coded
2. General.
PA except that it is deteriorative
This Repair Parts and Special Tools List is divided
in nature.
into the following sections:
XD
----
A support item that is not
a. Section II. Repair Parts List. A list of spares
stocked.  When required, item
and repair parts authorized for use in the performance of
will be procured through normal
maintenance. Parts are listed in figure and item number
supply channels.
sequence. Items are indented when required to indicate
the relationship to the next higher assembly.
NOTE
Cannibalization or salvage may be
b. Section 111.
Special Tools List.
(Not
used as a source of supply for any
Applicable).
items source coded above except
aircraft support items as restricted
c. Section IV.  National Stock Number and Part
by AR 700-42.
Number Index.  A list, in ascending National Item
Identification Number (NIIN) sequence, of all National
(2) Maintenance Code.  Maintenance codes
stock numbers appearing in the listings, followed by a
are assigned to indicate the levels of maintenance
list, in alphameric sequence, of all part numbers
authorized to USE and REPAIR support items.  The
appearing in the listings.  National stock number and
maintenance codes are entered in the third and fourth
part numbers are cross-referenced to each illustration
positions of the Uniform SMR Code format as follows:
figure and item number appearance.
(a) The maintenance code entered in
3. Explanation of Columns.
the third position will indicate the lowest maintenance
level authorized to remove, replace, and use the support
a. Illustration. This column is divided as follows:
item.  The maintenance code entered in the third
position will indicate the following level of maintenance:
(1) Figure Number.
Indicates the figure
number of the illustration in which the item is shown.
Code
Application/Explanation
O
---
Support  item  is  removed,
(2) Item Number.
The number used to
replaced, used at the Aviation
identify each item called out in the illustration.
Unit Maintenance (AVUM) level.
b. Source, Maintenance, and Recoverability Codes
(b) The maintenance code entered in
(SMR).
the fourth position indicates whether the item is to be
repaired and identifies the lowest maintenance level
(1) Source Code. Source codes are assigned
with the capability to perform complete repair (i.e., all
to support items to indicate the manner of acquiring
authorized maintenance functions).  This position will
support items for maintenance, repair, or overhaul of
contain the following maintenance code:
end items. Source codes are entered in the first and
second positions of the Uniform SMR Code format as
follows:
2

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