b. Repair parts mortality has been based on
opposite the first appearance of each item, is the
1500 hours operation per year.
total quantity of items authorized for the number
of equipments supported. Subsequent appear-
c. Parts which required manufacture or assem-
ances of the same item will have the letters
bly at a category higher than that authorized for
"REF" in the applicable allowance column. To
installation will indicate in the source column the
locate the referenced item locate the FSN or
reference number in the index. The earliest
d. The following publications pertain to the
figure and item number is the referenced item.
welding machine and its components:
Items authorized for use as required but not for
Operator, Organizational Direct
initial stockage are identified with an asterisk in
and General Support and De-
the allowance column.
pot Maintenance Manual
(2) The quantitative allowances for DS/GS
e. The same illustrations are used to illustrate
levels of maintenance will represent initial stock-
the repair parts and special tools listed in both
age for a 30-day period for the number of equip-
organizational maintenance section and direct and
general support and depot maintenance section.
(3) To determine allowances when support-
ing more than 100 of these equipments: First,
5. How to Locate Repair Parts
divide the number of equipments supported by
100 by moving the decimal two places left; second,
a. When Federal stock number or reference
multiply the result by the quantity in the 51100
number is unknown:
density column. Example, authorized allowance
(1) First. Using the table of contents de-
for 51100 equipments is 40; for 150 equipments
termine the assembly group within which the
multiply 40 by 1.50 or 60 parts required.
repair part belongs. This is necessary since illus-
h. 1-Year Allowance Per 100 Equipments/Con-
trations are prepared for assembly groups, and
tingency Planning Purposes. Indicates opposite
listings are divided into the same groups.
the first appearance of each item the total quan-
(2) Second. Find the illustration covering
tity required for distribution and contingency
the assembly group to which the repair part be-
planning purposes. The range of items indicates
total quantities of all authorized items required
(3) Third. Identify the repair part on the
to provide for adequate support of 100 equip-
illustration and note the illustration figure and
ments for one year. Subsequent appearances of
item number of the repair part.
the same item will have the letters "REF" in the
(4) Fourth. Using the Repair Parts List-
ings, find the assembly group to which the repair
i. Depot Maintenance Allowance Per 100
part belongs and locate the illustration figure and
Equipments. Indicates opposite the first appear-
item number noted on the illustration.
ance of each item the total quantity authorized
for depot maintenance of 100 equipments. Subse-
b. When Federal stock number or reference
quent appearances of the same item will have the
number is known:
letters "REF" in the allowance column. Items
(1) First. Using the Index of Federal Stock
authorized for use as required but not for initial
Numbers and Reference Numbers find the perti-
stockage are identified with an asterisk in the
nent Federal stock number or reference number.
This index is in ascending FSN sequence followed
j. Illustration. This column is divided as fol-
by a list of reference numbers in alpha-numeric
sequence, cross-referenced to the illustration fig-
(1) Figure number. Indicates the figure
ure number and item number.
number of the illustration in which the item is
(2) Second. Using the Repair Parts Listing,
find the assembly group of the repair part and the
(2) Item number. Indicates the callout num-
illustration figure number and item number ref-
ber used to reference the item in the illustration.
erenced in the Index of Federal Stock Numbers
and Reference Numbers.
4. Special Information
c. When the Federal stock number or reference
a. Identification of the usable on codes included
number is known and the repair part is not illus-
in the description column of this publication are