TM 5-4520-253-23P
UNIT AND DIRECT SUPPORT MAINTENANCE
REPAIR PARTS AND SPECIAL TOOLS LIST
SECTION I. INTRODUCTION
1. SCOPE. This RPSTL lists and authorizes spares and repair parts; special tools; special test,
measurement, and diagnostic equipment (TMDE); and other special support equipment required for
performance of Unit and Direct Support Maintenance of the Space Heater, It authorizes the requisitioning,
issue, and disposition of spares, repair parts and special tools as indicated by the source, maintenance
and recoverability (SMR) codes.
2. GENERAL. In addition to this section, Introduction, this Repair Parts and Special Tools List is divided
into the following sections:
a. Section Il. Repair Parts List. A list of spares and repair parts authorized by this RPSTL for use in
the performance of maintenance. The list also includes parts which must be removed for replacement of
the authorized parts. Parts lists are composed of functional groups in ascending alphanumeric sequence
with the parts in each group listed in ascending figure and item number sequence. Bulk materials are
listed in item name sequence. Repair parts kits are listed separately in their own functional group within
Section Il. Repair parts for repairable special tools are also listed in this section. Items listed are shown
on the associated illustration(s) /figure(s).
b. Section Ill. Special Tools List. A list of special tools, special TMDE, and other special support
equipment authorized by this RPSTL (as indicated by Basis of Issue (BOI) information in DESCRIPTION
AND USABLE ON CODE column) for the performance of maintenance.
c. Section IV. Crossreferences Indexes. A list, in National Item Identification Number (NIIN)
sequence, of all National stock numbered items appearing in the listing, followed by a list in alphanumeric
sequence of all part numbers appearing in the listings. National stock numbers and part numbers are
cross referenced to each illustration figure and item number appearance. The figure and item number
index lists figure and item number in alphanumeric sequence and cross references NSN, FSCM and part
number.
3. EXPLANATION OF COLUMNS (SECTIONS II AND Ill).
a. ITEM NO. (Column (1 )). Indicates the number used to identify items called out in the illustration
b. SMR Code (Column (2)). The Source, Maintenance, and Recoverability (SMR) code is a
5position code containing supply/requisitioning information, maintenance category authorization criteria,
and disposition instruction, as shown in the following breakout:
Source
Code
1st two
How you get an item
Maintenance
code
positions
3rd position
4th poition
Who can install re-
Who can do com-
place or use the
plete repair* on
item
the item
Recoverabilily
Code
Who determines dis-
position action on an
unservicable item
1