TM-9-2920-258-30-P
ALTERNATOR, 180 AMPERES, MODEL 5520AB
TECHNICAL MANUAL; DIRECT SUPPORT MAINTENANCE MANUAL
APRIL 1989
TM-9-2920-258-30-P - Page 37 of 76
TM 9-2920-258-30&P
AH - (Assembled by
GS Category)
AD - (Assembled by
Depot)
XA
XB
x c
XD
NOTE:
the SMR code authorizes you to replace the item, but the source
code indicates the item is assembled at a higher level, order the item
from the higher level of maintenance.
- 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 FSCM 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 FSCM 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 maintenance.
O
- Organizational category can remove, replace, and use the item.
F
- Direct Support level can remove, replace, and use the item.
H
- General Support level 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 is the lowest level that can do complete repair of the item.
F
- Direct Support 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.
B-3
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