C2, TM 9-6625-1754-14
h. One-Year Allowances Per 100 Equip-
(3) Organizational units providing main-
tenance for more than 100 of these equipments
dicates opposite the first appearance of each item
s h a l l determine the total quantity of parts
the total quantity required for distribution and
required by converting the equipment quantity
c o n t i n g e n c y planning purposes. The range of
to a decimal point before the next to last digit of
items indicates total quantities of all authorized
the number to indicate hundredths, and
items required to provide for adequate support of
m u l t i p l y i n g the decimal factor by the parts
100 equipments for one year.
q u a n t i t y authorized in the 51-100 allowance
column. Example, authorized allowance for 51-
i. Depot Maintenance Allowance Per 100
100 equipments is 12; for 140 equipments
E q u i p m e n t s . Indicates opposite the first ap-
multiply 12 by 1.40 or 16.80 rounded off to 17
pearance o f e a c h i t e m t h e t o t a l q u a n t i t y
authorized for depot m a i n t e n a n c e o f 1 0 0
(4) Subsequent changes to allowances will
equipments. Subsequent appearances of the
be limited as follows: No change in the range of
s a m e item will have the letters "REF" in the
i t e m s is authorized. If additional items are
allowance column. Items authorized for use as
c o n s i d e r e d necessary, recommendation should
required but not for initial stockage are iden-
be forwarded to Commanding General, U.S.
tified with an asterisk in the allowance column.
A r m y Electronics Command, ATTN: AMSEL-
M E - N M P - E M , Fort Monmouth, NJ 07703 for
(1) F i g u r e n u m b e r . Indicates the figure
exception or revision to the allowance list.
number of the illustration in which the item is
Revisions to the range of items authorized will be
made by the USAECOM National Maintenance
(2) Item number or reference designation.
Point based upon engineering experience,
Indicates t h e i t e m n u m b e r o r reference
d e m a n d data, or TAERS information.
d e s i g n a t i o n used to identify the item in the
g. 30-Day DS/GS Maintenance Allowances.
C - 4 . Special Information
Allowances in GS Column are GS
a. Identification of the usable on codes of this
m a i n t e n a n c e only.
p u b l i c a t i o n are:
(1) The allowance columns are divided into
three subcolumns. Indicated in each subcolumn,
opposite the first appearance of each item, is the
AN / USM-303A
total quantity of items authorized for the number
b. Repair parts mortality is computed from
of equipments supported. Subsequent ap-
failure rates derived from experience factors with
pearances of the same item will have the letters
the individual parts in a variety of equipments.
" R E F " in the applicable allowance columns.
Variations in the specific application and periods
Items authorized for use as required but not for
of use of electronics equipment, the fragility of
initial stockage are identified with an asterisk in
electronic piece parts, plus intangible material
the allowance column.
and quality factors intrinsic to the manufacture
( 2 ) The quantitative allowances for GS
of electronic parts, do not permit mortality to be
l e v e l s of maintenance will represent initial
based on hours of end item use. However, long
stockage for a 30-day period for the number of
p e r i o d s of continuous use under adverse con-
e q u i p m e n t s supported.
ditions are likely to increase repair parts mor-
(3) Determination of the total quantity of
parts required for maintenance of more than 100
C - 5 Location Of Repair Parts
o f these equipments can be accomplished by
a. This appendix contains two cross reference
converting the equipment quantity to a decimal
indexes (sec. VII and VIII) to be used to locate a
factor by placing a decimal point before the next
repair part when either the Federal stock
t o last digit of the number to indicate hun-
number, reference number (manufacturer's part
dredths, and multiplying the decimal factor by
number), or reference designation is known. The
t h e parts quantity authorized in the 51-100
first column in each index is prepared in
equipments is 40; for 150 equipments multiply
n u m e r i c a l and/or alphanumeric sequence is
40 by 1.50 or 60 parts required.