munication, those repair parts authorized up to
(d) Column D. Not used.
and including fourth echelon are authorized for
(2) Federal stock number. This column lists
stockage by the organization operating this equip-
the 11-digit Federal stock number.
ment.
(3) Designation by model. The dagger (†)
indicates model in which the part is used.
3. Electron Tubes
(4) Description. Nomenclature or the stand-
The consumption rates given for tubes are con-
ard item name and brief identifying data
servative theoretical estimates and are provided for
for each item are listed in this column.
use only when more complete information, such as
When requisitioning, enter the nomencla-
data based on operating experience, is not available.
ture and description.
These figures are based on levels and requirements
for equipment actually in use, not on authoriza-
(5) Unit of issue. The unit of issue is each
tions or equipment stored in depots.
unless otherwise indicated and is the sup-
ply term by which the individual item is
counted for procurement, storage, requi-
sitioning, allowances, and issue purposes.
a. The allowance factors are based on 100 equip-
(6) Expendability. Nonexpendable items are
ments. In order to determine the number of parts
Expendable items are
indicated by NX.
authorized for initial stockage for the specific num-
not annotated.
ber of equipments supported, the following formula
will be used and carried out to two decimal places.
(7) Quantity incorporated in unit. This col-
umn lists the quantity of each part found
Specific number of equipments supported
in a given assembly, component, or equip-
allowance factor
ment.
= Number of parts
x
100
(8) Field (third echelon). No parts authorized
authorized for initial stockage.
for stockage at third echelon.
(9) Field (fourth echelon). The numbers in
b. Fractional values obtained from above com-
this column indicate quantities of repair
p u t a t i o n will be rounded to whole numbers as fol-
parts authorized for initial stockage for
lows :
use in fourth echelon maintenance. The
(1) When the total number of parts authorized
quantities are based on 100 equipments to
is less than 0.5, the quantity authorized
be maintained for a 15-day period.
will be zero.
(10) Depot (fifth echelon). The numbers in
(2) When the total number of parts authorized
this column indicate quantities of repair
is between 0.5 and 1.0, the quantity au-
parts authorized for depot maintenance
thorized will be one.
and for initial stockage for maintenance,
and for supply support to lower echelons.
(3) For all values above one, fractional values
The entries are based on the quantity re-
below 0.5 will revert to the next lower
quired for rebuild of 100 equipments.
whole number and fractional value 0.5 and
above will advance to the next higher
(11) Illustrations. The "Item No." column lists
whole number.
the reference symbols used for identifica-
tion of the items in the illustration or text
c. The quantities determined in accordance with
of the manual.
the above computation represent the initial stockage
for a 15-day period.
2. Parts for Maintenance
5. References
When this equipment is used by signal service
organizations organic to the theater headquarters
A maintenance allocation chart and basic issue
items list are contained in TM 11662552414.
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