Maintenance Code - TM-55-4920-439-13-P0087

TM 55-4920-439-13&P

Code

Explanation

AO - (Assembled by

org/AVUM

Category

Items with these codes are not to be requested/requisitioned individually. The parts that make

AF - (Assembled by

up the assembled item must be requisitioned or fabricated and assembled at the category of

(DS/AVIM

maintenance indicated by the source code. If the 3d position code of the SMR code authorizes

Category)

you to replace the item, but the source code indicates the item is assembled at a higher

AH - (Assembled by

category, order the item from the higher category of maintenance.

GS Category)

AD - (Assembled by

Depot)

XA -

Do not requisition an "XA"-coded item. Order its next higher assembly. (Also, re fer to the NOTE below.)

XB -

If an "XB" item is not available from salvage, order it using the FSCM and part number given.

XC -

Installation drawing, diagram, instruction sheet, field service drawing, that is identified by manufacturer's part

number.

XD -

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.

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 700-42.

(2) Maintenance Code. Maintenance codes tell you the category(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 category authorized

to remove, replace, and use an item. The maintenance code entered in the third position will indicate authorization to one

of the following categories of maintenance.

Code

Application/Explanation

- Crew or operator maintenance done within organizational or aviation unit

maintenance.

- Organizational or aviation unit category can remove, replace, and use the hem.

- Direct support or aviation intermediate category can remove, replace, and use the

item.

- General support category can remove, replace, and use the item.

C-3