DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
M198/M777 HOWITZER FIRE CONTROL
INTRODUCTION TO REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL)
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 direct
support and general support maintenance of the M198/M777 Howitzer Fire Control. It authorizes the
requisitioning, issue, and disposition of spares, repair parts, and special tools as indicated by the source,
maintenance, and recoverability (SMR) codes.
In addition to the Introduction work package, this RPSTL is divided into the following work packages.
1. Repair Parts List Work Packages. Work packages containing lists of spares and repair parts
authorized by this RPSTL for use in the performance of maintenance. These work packages also include
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. Sending units, brackets, filters, and bolts are listed with the component they mount
on. Bulk materials are listed by item name in FIG. BULK at the end of the work packages. Repair parts
kits are listed separately in their own functional group and work package. Repair parts for reparable
special tools are also listed in a separate work package. Items listed are shown on the associated
2. Special Tools List Work Package. Work packages containing lists of special tools, special TMDE, and
special support equipment authorized by this RPSTL (as indicated by Basis of Issue (BOI) information in
the DESCRIPTION AND USABLE ON CODE (UOC) column). Tools that are components of common tool
sets and/or Class VII are not listed.
3. Cross-Reference Indexes Work Packages. There are two cross-reference index work packages in this
RPSTL: the National Stock Number (NSN) Index work package and the Part Number (P/N) Index work
package. Both of the work packages refer you to the figure and item number.
EXPLANATION OF COLUMNS IN THE REPAIR PARTS LIST AND SPECIAL TOOLS LIST WORK
ITEM NO. (Column (1)). Indicates the number used to identify items called out in the illustration.
SMR CODE (Column (2)). The SMR code containing supply/requisitioning information, maintenance level
authorization criteria, and disposition instruction, as shown in the following breakout: