Section I. INTRODUCTION - TM-55-1730-221-20P0004

TM 55-1730-221-20P

Section I. INTRODUCTION

Code

Definition

1. Scope.

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Item procured and stocked for

anticipated or known usage.

This manual lists spares and repair parts required

for performance of Aviation Unit Maintenance (AVUM)

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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.

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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:

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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

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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: