TM 55-4920-244-14
B-3. Explanation of Format.
a. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to match
components, assemblies, sub-assemblies, and modules with the next higher assembly.
b. Column 2, Functional Group. Column 2 lists the next higher assembly group and the item
names of components, assemblies, subassemblies and modules within the group for which maintenance
is authorized.
c. Column 3, Maintenance Function. Column 3 lists the twelve maintenance functions defined
in B-2 above. Each maintenance function required for an item shall be specified by the symbol among
those listed in d below which indicates the level responsible for the required maintenance. Under this
symbol there shall be listed an appropriate work measurement time value determined as indicated in
e below.
d. Use of Symbols. The following symbols shall be used to prescribe work function responsi-
bility:
O - Organization
F - Direct Support
H - General Support
D - Depot
The higher level of maintenance has the authority to determine:
(1) If the lower level is capable of performing the work.
(2) If the lower level will require assistance or technical supervision and on-site inspection.
(3) If the authorization will be granted.
e. Work Measurement Time. The active rep air time required to perform the maintenance func-
tion.
f. Column 4, Tools and Equipment. This column used to specify, by code, those tools and test
equipment required to preform the designated function.
g. Column 5, Remarks. Self-explanatory.
Change 4
B-2
