Explanation of Format.

TM 55-4920-325-14&P

i . R e p l a c e . The act of substituting a serviceable like-type part,

subassembly, module (component or assembly) in a manner to allow the proper

f u n c t i o n i n g of an equipment/system.

j. Service. O p e r a t i o n s r e q u i r e d p e r i o d i c a l l y t o k e e p a n i t e m i n p r o p e r

o p e r a t i n g conditions, i.e. , to clean, preserve, d r a i n , p a i n t , o r t o r e p l e n i s h

fuel/lubricants/hydraulic fluids or compressed air supplies.

k . T e s t . To verify serviceability and to detect incipient failure by

m e a s u r i n g the mechanical or electrical characteristics of an item and comparing

those characteristics with prescribed standards.

l . S y m b o l s . T h e uppercase letter placed in the appropriate column indicates

the lowest level at which that particular maintenance function is to be performed.

B - 3 . Explanation of Format.

Purpose and use of the format are as follows:

a. Column 1. G r o u p n u m b e r . C o l u m n 1 lists group numbers, the purpose of

which is to match components, assemblies, subassemblies and modules with the next

h i g h e r assembly.

b . C o l u m n 2 . F u n c t i o n a l g r o u p . C o l u m n 2 lists the next higher assembly

group and the item names of components, assemblies, subassemblies and modules with-

i n the group for which maintenance is authorized.

c . C o l u m n 3 . M a i n t e n a n c e function. C o l u m n 3 lists the twelve maintenance

f u n c t i o n s defined in B-2 above. E a c h maintenance function required for an item

s h a l l be specified by the symbol among those listed in d below which indicates the

level responsible for the required maintenance.

d. Use of symbols.

T h e following symbols shall be used to prescribe work

function responsibility:

Operator/Crew

organization

Direct Support

G e n e r a l Support

Depot

Tools and equipment. T h i s column shall be used to specify,

e. Column 4.

b y code, those tools and test equipment required to perform the designated

function.

f . Column 5. R e m a r k s .

Self-explanatory.

B-2