TM 55-4920-413-13&P
APPENDIX C
REPAIR PARTS AND SPECIAL TOOLS LIST
Section I. INTRODUCTION
1. Scope
This manual lists spares and repair parts required for per-
formance of Aviation Unit Maintenance (AVUM) and Aviation
Intermediate Maintenance (AVIM) of the Instrument Display
System Line Test Set. It authorizes the requisitioning and is-
sue of spares and repair parts as indicated by the source and
maintenance codes.
2. General
This Repair Parts and Special Tools List is divided into the
following sections
a. Section II. Repair Parts List. A list of spares and repair
parts authorized for use in the performance of maintenance.
Parts are listed in figure and item number sequence. Items are
indented when required to indicate the relationship to the next
higher assembly.
b. Section III. Special Tools List. (Not Applicable.)
c. Section IV. National Stock Number and Part Number ln-
dex. A list, in descending National Item Identification Num-
ber (NIIN) sequence, of all National Stock Numbers (NSN),
or Management Control Numbers (MCN) appearing in the list-
ings, followed by a list in alphanumeric sequence, of all part
numbers appearing in the listings. National Stock Numbers or
Management Control Numbers and part numbers are cross-
-referenced to each illustration figure and item number ap-
pearance.
3. Explanation of Columns.
a. Illustration. This column is divided as follows:
(1) Figure Number. Indicates the figure number of the il-
lustration in which the item is shown.
(2) Item Number. The number used to identify each item
called out in the illustration.
b. Source, Maintenance, and Recoverability Codes (SMR).
(1) Source Code. Source codes are assigned to support
items to indicate the manner of acquiring support items for
maintenance, repair, or overhaul of end items. Source codes are
entered in the first and second positions of the Uniform SMR
Code format as follows:
Code
Definition
PA --- Item procured and stocked for anticipated or known
usage.
AD
--- Item to be assembled at depot maintenance level.
NOTE
Cannnibalization or salvage maybe used as a source
of supply for any items source coded above except
aircraft support items as restricted by AR 700-42.
(2) Maintenance Code. Maintenance codes are assigned to
indicate the levels of maintenance authorized to USE and RE-
PAIR support items. The maintenance codes are entered in the
third and fourth positions of the Uniform SMR Code format
as follows:
(a) The maintenance code entered in the third position
will indicate the lowest maintenance level authorized to re-
move, replace, and use the support item. The maintenance code
entered in the third position will indicate the following level
of maintenance:
Code
Application/Explanation
0 --- Support item is removed, replaced, used at the Avia-
tion Unit Maintenance (AVUM) level.
(b) The maintenance code entered in the fourth position
indicates whether the item is to be repaired and identities the
lowest maintenance level with the capability to perform com-
plete repair (i.e., all authorized maintenance functions). This
position will contain the following maintenance code:
C-1
