TM 5-4310-393-24P
XB
If an "XB" item is not available from salvage, order it using the
CAGEC and part number given.
XC
Installation drawing, diagram, instruction sheet, field service
drawing, that is identified by Reciprocating Compressor Unit's
manufacturers part number
XD
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.
NOTE
Cannibalization or controlled exchange, when authorized, may be 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 750-1.
(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 organizational or aviation unit maintenance.
O
- Organizational 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
- Organizational 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 is the lowest level that can do complete repair of the item.
D
- Depot is the lowest level that can do complete repair of the item.
3
