TM-9-2350-311-24P-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE REPAIR PARTS AND SPECIAL TOOLS LIST

SEPTEMBER 1994
TM-9-2350-311-24P-1

  TM-9-2350-311-24P-1 - Page 13 of 637

TM 9-2350-311-24P-1
XA
XB
XC
XD
NOTE:
- Do not requisition an “XA’’-coded item. Order its next higher assembly. (Also, refer to
the NOTE below.)
- If an “XB” item is not available from salvage, order it using the CAGEC and part number
given.
- Installation drawing, diagram, instruction sheet, field service drawing, that is identified
by manufacturer’s part number.
- Item is not stocked. Order an “XD’’-coded item through normal supply channels using
the CAGEC and part number given, if no NSN is available.
Cannibalization or controlled exchange, when authorized, maybe used as a source of
supply for items with the above source codes, except for those source coded “XA” or
those aircraft support items restricted by requirements of AR 700-42.
(2) Maintenance Code. Maintenance codes tells you the level(s) of maintenance authorized to
USE and REPAIR support items. The maintenance codes are entered in the third and fourth positions of the SMR
Code as follows:
(a) The maintenance code entered in the third position tells you the lowest maintenance level
authorized to remove, replace, and use an item. The maintenance code entered in the third position will indicate
authorization to one of the following levels of maintenance.
Code
Application/Explanation
C
-Crew or operator maintenance done within unit or aviation unit maintenance.
O
-Unit or aviation unit category can remove, replace, and use the item.
F
-Direct support or aviation intermediate level can remove, replace, and use the
item.
H
-General support level can remove, replace, and use the item.
L
-Specialized repair activity can remove, replace, and use the item.
D
-Depot level can remove, replace, and use the item.
(b) The maintenance code entered in the fourth position tells whether or not the item is to be
repaired and identifies the lowest maintenance level with the capability to do complete repair (i.e., perform all
authorized repair functions).
(NOTE:
Some limited repair may be done on the item at a lower level of maintenance,
if authorized by the Maintenance Allocation Chart (MAC) and SMR codes.) This position will contain one of the
following maintenance codes.
Code
Application/Explanation
O
-Unit or aviation unit is the lowest level that can do complete repair of the item.
F
-Direct support or aviation intermediate is the lowest level that can do complete
repair of the item.
H
-General support is the lowest level that can do complete repair of the item.
L
-Specialized repair activity (designate the specialized repair activity) is the
lowest level that can do complete repair of the item.
3


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